Engineering Geology

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E n g i n e e r i n g G e o l o g y Figure 9.28 Foundation failure. the greater the width, the larger the bearing capacity, whereas it is of little effect in saturated clays. With uniform soil conditions, the ultimate bearing capacity increases with depth of installation of the foundation structure. This increase is associated with the confining effects of the soil, the decreased overburden pressure at foundation level and with the shear forces that can be mobilized between the sides of the foundation structure and the ground. There are usually three stages in the development of a foundation failure. Firstly, the soil beneath the foundation is forced downwards in a wedge-shaped zone (Fig. 9.28). Consequently, the soil beneath the wedge is forced downwards and outwards, elastic bulging and distortion taking place within the soil mass. Secondly, the soil around the foundation perimeter pulls away from the foundation, and the shear forces propagate outward from the apex of the wedge. This is the zone of radial shear in which plastic failure by shear occurs. Thirdly, if the soil is very compressible or can endure large strains without plastic flow, then the failure is confined to fan-shaped zones of local shear. The foundation displaces downwards with little load increase. On the other hand, if the soil is more rigid, the shear zone propagates outward until a continuous surface of failure extends to ground surface and the surface heaves. The weight of the material in the passive zone resists the lifting force and provides the reaction through the other two zones that counteract the downward motion of the foundation structure (Fig. 9.28). Hence, the bearing capacity is a function of the resistance to the uplift of the passive zone. This, in turn, varies with the size of the zone (which is a function of the internal angle of friction), with the unit weight of the soil and with the sliding resistance along the lower surface of the zone (which is a function of the cohesion, internal angle of friction and unit weight of the soil). A surcharge placed on the passive zone or an increase in the depth of the foundation therefore increases the bearing capacity. The stress distribution due to a structure declines rapidly with depth within the soil. It should be determined in order to calculate the bearing capacity and settlement at given depths. 542
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Engineering Geology
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Engineering Geology Second Edition
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Preface As noted in the Preface to
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Contents 1. Rock Types and Stratigr
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Contents Field Instrumentation 344
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Chapter 1 Rock Types and Stratigrap
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Chapter 1 several tens of metres bu
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Chapter 1 Figure 1.4 Distribution o
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Chapter 1 Figure 1.5 Lapilli near C
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Chapter 1 Figure 1.7 (a) Ropy or pa
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Chapter 1 Figure 1.8 Columnar joint
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Chapter 1 Figure 1.9 Pegmatite vein
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Chapter 1 Figure 1.10 Thin section
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Chapter 1 Figure 1.11 An old quarry
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Chapter 1 a b Figure 1.13 (a) Gneis
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Chapter 1 and the types of country
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Chapter 1 A variety of minerals suc
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Chapter 1 metasomatic activity is c
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Chapter 1 derived by partial intras
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Chapter 1 character (are they irreg
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Chapter 1 the top. Individual grade
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Chapter 1 Figure 1.20 Thin section
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Chapter 1 Montmorillonite [(Mg,Al)
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Chapter 1 Figure 1.22 Salt teepees
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Chapter 1 The extent and regularity
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Chapter 1 the lowest bed in the upp
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Table 1.1. The geological timescale
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Chapter 1 The principal way in whic
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Chapter 2 Geological Structures The
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Chapter 2 (b) Figure 2.2 (a) Block
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Chapter 2 (b) Figure 2.4 (a) Types
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Chapter 2 Figure 2.6 Chevron fold i
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Chapter 2 direction of extension. T
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Chapter 2 Figure 2.9 Types of fault
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Chapter 2 Figure 2.11 (a) Repetitio
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Chapter 2 side of a fault are of di
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Chapter 2 Figure 2.14 Geometric ori
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Chapter 2 As joints represent surfa
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Chapter 2 (several metres). The int
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Chapter 2 Strength of Discontinuous
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Chapter 2 Table 2.5. Classification
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73 Figure 2.17 Discontinuity survey
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Chapter 2 Figure 2.19 Representatio
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Chapter 3 Surface Processes All lan
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Chapter 3 humid regions more than d
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Chapter 3 Figure 3.3 Honeycomb weat
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Chapter 3 less soluble than limesto
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Chapter 3 Figure 3.4 The slake-dura
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Chapter 3 Because weathering brings
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Chapter 3 Figure 3.6 Approaches to
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Chapter 3 Figure 3.7 Valley bulging
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Chapter 3 Internal slides are usual
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Chapter 3 Figure 3.8 A classificati
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Chapter 3 Figure 3.10 Block diagram
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Chapter 3 direct factor in causing
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Chapter 3 Figure 3.14 (a) Trellised
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Chapter 3 Throughout its length, a
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Chapter 3 Figure 3.17 (a) Paired ri
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Chapter 3 Figure 3.18 Component par
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Chapter 3 In the early stages of ri
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Chapter 3 Karst Topography and Unde
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Chapter 3 Figure 3.22 Appearance of
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Chapter 3 the surface throughout th
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Chapter 3 Figure 3.25 Drumlins, nea
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Chapter 3 barrier, the threshold, o
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Chapter 3 Most melt water streams t
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Chapter 3 Other small ridge-like ka
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Chapter 3 of perennially frozen gro
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Chapter 3 Wind Action Wind erosion
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Chapter 3 Figure 3.32 Buttes and me
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Chapter 3 areas in which there is e
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Chapter 3 commonly falls in both in
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Chapter 3 Figure 3.35 Terminology o
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Chapter 3 disrupts their pattern of
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Chapter 3 is extended out to sea. B
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Chapter 3 (a) (b) Figure 3.37 (Cont
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Chapter 3 Table 3.2. Average beach
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Figure 3.38 Hurst Castle Spit with
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Chapter 3 windspeeds of approximate
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Chapter 3 Free oscillations develop
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Chapter 4 Groundwater Conditions an
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Chapter 4 Figure 4.1 Map of part of
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Chapter 4 buried upper surface of a
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Chapter 4 Table 4.2. Soil suction p
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Chapter 4 The factors affecting the
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Chapter 4 Table 4.3. Some examples
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Chapter 4 Permeability and porosity
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Chapter 4 Flow through Soils and Ro
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Chapter 4 General Equation of Flow
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Chapter 4 and k h H / k + H / k + H
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Chapter 4 Figure 4.8 Standard piezo
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Chapter 4 velocity of the upward se
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Geological mapping frequently forms
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Chapter 4 As groundwater moves from
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Chapter 4 Figure 4.9 Drillhole pack
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Chapter 4 Figure 4.10 Yield drawdow
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Chapter 4 Figure 4.11 Flow net bene
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Chapter 4 in sedimentary rocks. The
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Chapter 4 Figure 4.12 Gravel-packed
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Chapter 4 In addition, the fracture
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Chapter 4 to another as groundwater
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Chapter 4 Figure 4.14 An example of
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Chapter 4 Many of the VOCs are liqu
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Chapter 4 Table 4.7. Composition of
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Chapter 4 Migration control is cons
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Description, Properties and Behavio
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Chapter 5 Table 5.2.—Cont’d. In
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Chapter 5 Table 5.2.—Cont’d. In
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Chapter 5 Table 5.3b. Plasticity ac
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Chapter 5 Table 5.6. Mixed coarse s
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Chapter 5 reduced accordingly, henc
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Chapter 5 enough cement to develop
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Chapter 5 Figure 5.2 Particle size
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Chapter 5 this was indicative of me
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Chapter 5 Table 5.12. Particle size
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Chapter 5 Table 5.13. USAEWES class
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Chapter 5 Table 5.14. Range of comp
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Chapter 5 sensitivity, namely, inse
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Chapter 5 Table 5.15. Strength of w
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Chapter 5 They differ from laterite
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Chapter 5 (a) (b) Figure 5.7 (a) Po
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Chapter 5 supply of sand, the wind
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Chapter 5 Tills and Other Glacially
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Chapter 5 Figure 5.11 Variation in
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Chapter 5 Table 5.18a. A weathering
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Chapter 5 Table 5.19. Some properti
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Chapter 5 thick, or as ice wedges.
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Chapter 5 Figure 5.14 Increase in c
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Chapter 5 Organic Soils: Peat Peat
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Chapter 5 when peat possesses high
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Chapter 5 and the discontinuities t
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Genetic/group Metamorphic Igneous U
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Chapter 5 Table 5.25. Grades of unc
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Chapter 5 which lavas, pyroclasts a
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Chapter 5 preferred orientation. Ge
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Chapter 5 Table 5.30. Some geomecha
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Table 5.31. Some geomechanical prop
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Chapter 5 When a load is applied to
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Chapter 5 Furthermore, carbonate ro
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Chapter 5 water that drains into li
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Table 5.33. Some physical propertie
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Chapter 5 Evaporites The dry densit
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Chapter 5 suggest that the rock is
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Chapter 6 Geological Materials Used
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Chapter 6 one of the shortcomings o
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Stancliffe Buff Fine to Namurian me
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Chapter 6 drainage and escape of mo
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Chapter 6 Figure 6.2 Black crust de
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Chapter 6 Limestones show a variati
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Chapter 6 Figure 6.4 Coarse-grained
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Chapter 6 Usually, armourstone is s
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Chapter 6 The crushing strength of
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Chapter 6 the polishing action of t
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Chapter 6 a poor ability to absorb
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Chapter 6 crushing plant. After cru
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Chapter 6 Alluvial cones are found
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Chapter 6 Ball clays and china clay
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Chapter 6 Sulphate minerals in mudr
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Chapter 6 is to be extracted (Bell,
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Chapter 6 clay, or they may be brou
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Chapter 7 Site Investigation The ge
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Chapter 7 factors throughout this s
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Chapter 7 Infrared linescanning is
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Chapter 7 by satellites 800 km out
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Chapter 7 Table 7.2. Types of photo
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Chapter 7 Figure 7.1 Drillhole log.
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Chapter 7 Figure 7.2 Light cable an
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Chapter 7 Figure 7.3 Wash-boring ri
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Chapter 7 Figure 7.4 The general-pu
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Chapter 7 Figure 7.6 Section throug
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Chapter 7 Figure 7.8 Rotary percuss
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Chapter 7 Figure 7.11 Double-tube s
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Chapter 7 Figure 7.12 Standard pene
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Chapter 7 Figure 7.13 An electric p
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Chapter 7 Figure 7.15 Shear vane te
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Chapter 7 provide a sufficiently st
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Chapter 7 Figure 7.18 (a) Schematic
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Chapter 7 movements are needed in c
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Chapter 7 Figure 7.22 Borehole incl
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Chapter 7 hemispherical wave front
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Chapter 7 The most common arrangeme
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Chapter 7 Table 7.5. Resistivity of
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Chapter 7 Figure 7.25 Wenner and Sc
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Chapter 7 As a consequence, the met
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Chapter 7 Figure 7.26 Magnetometer
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Chapter 7 north-south distance, the
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Chapter 7 large SPs, whereas shales
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Chapter 7 the foundation conditions
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Chapter 7 Figure 7.29 Geomorphologi
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Chapter 7 purpose, have a larger sc
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Table 7.7a. Excerpts from the engin
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6b Chiefly Widespread in 10-13, 18-
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Table 7.8. Advantages and disadvant
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Chapter 8 Geology, Planning and Dev
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Chapter 8 It therefore is important
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Chapter 8 If there are no mitigatio
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Chapter 8 Figure 8.2 (a) An example
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Chapter 8 to nueés ardentes, the e
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387 Figure 8.3 (a) Preliminary haza
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Chapter 8 An earthquake propagates
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IX Ruinous. General panic. Masonry
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Chapter 8 standing in earthquakes t
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Chapter 8 In earthquake prone areas
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Chapter 8 Figure 8.7 Microseismic z
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Chapter 8 Figure 8.8 Landslide susc
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Chapter 8 concentrated into channel
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Chapter 8 magnitude or greater occu
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Chapter 8 occurs on average once in
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Chapter 8 Figure 8.12 Revetment com
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Chapter 8 Dunes act as barriers, en
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Chapter 8 Artificial replenishment
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Chapter 8 Figure 8.16 A breakwater
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Chapter 8 record of tsunamis is req
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Chapter 8 Movement of sand can bury
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Table 8.3. Objectives and methods o
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Chapter 8 Soil erosion by water is
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Chapter 8 The redistribution and re
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Chapter 8 Figure 8.19 Cellular cons
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Chapter 8 recommended that at dry s
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Chapter 8 Disposal of liquid hazard
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Chapter 8 any heat produced by radi
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Chapter 8 Tailings may also contain
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Chapter 8 The mining method is a ve
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Chapter 8 Figure 8.25 An example of
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Chapter 8 has passed by, the ground
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Chapter 8 Figure 8.27 Earth fissure
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Chapter 8 Figure 8.28 A tension sca
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Chapter 8 sinkholes and produced di
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Chapter 8 Figure 8.30 A survey of d
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Chapter 8 Figure 8.31 The Big Hole,
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Chapter 8 with various previous use
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Chapter 9 Geology and Construction
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Chapter 9 and there is no alternati
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Chapter 9 The ease of drilling in r
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Figure 9.1 Charge Q as a function o
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Table 9.1. Rippability rating chart
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Chapter 9 Table 9.2. Density, bulki
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Chapter 9 Figure 9.6 Dentition and
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Chapter 9 Figure 9.8 Reinforced ear
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Chapter 9 (a) (b) Figure 9.10 (a) S
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Chapter 9 of probe holes that fan o
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Chapter 9 Weathering of rocks leads
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Chapter 9 of the ground. If the str
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Chapter 9 and the dissipation of re
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methane toxic, it also is combustib
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Chapter 9 Bentonite slurry is used
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Chapter 9 some cutters are broken b
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Chapter 9 but occasionally it is us
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Table 9.4. The rock mass rating sys
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Chapter 9 Table 9.5. Guide for the
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491 H Zone containing clay minerals
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493 F Exceptionally high inflow or
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Chapter 9 3. The roughness of the m
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Figure 9.17 (a) Relationship betwee
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Chapter 9 Figure 9.18 Main stages i
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Chapter 9 the rate of inflow under
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Chapter 9 much by topography since
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Chapter 9 Impervious linings consum
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Chapter 9 being seriously curtailed
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Chapter 9 thinness, means that they
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Chapter 9 on the upstream side or a
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Chapter 9 Uplift pressure acts agai
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Chapter 9 Fresh metamorphosed rocks
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E n g i n e e r i n g G e o l o g y
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I n d e x coastal protection, 410,
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I n d e x grout, 526, 548 groutabil
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I n d e x rebound, 513 recumbent fo
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