Engineering Geology

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Chapter 9 but occasionally it is used in the excavation of the floor. Because fewer cracks are produced in the surrounding rock, it is stronger and so the desired roof curvature can be maintained to the greatest possible extent. Hence, the load-carrying capacity of the rock mass is utilized properly. Analysis of Tunnel Support The time a rock mass may remain unsupported in a tunnel is called its stand-up time or bridging capacity. This mainly depends on the magnitude of the stresses within the unsupported rock mass, which in their turn depend on its span, strength and discontinuity pattern. If the bridging capacity of the rock is high, the rock material next to the heading will stay in place for a considerable time. In contrast, if the bridging capacity is low, the rock will immediately start to fall at the heading so that supports have to be erected as soon as possible. The primary support for a tunnel in rock masses excavated by drilling and blasting, in particular, may be provided by rock bolts (with or without reinforcing wire mesh), shotcrete or steel arches (Clough, 1981). Rock bolts maintain the stability of an opening by suspending the dead weight of a slab from the rock above; by providing a normal stress on the rock surface to clamp discontinuities together and develop beam action; by providing a confining pressure to increase shearing resistance and develop arch action; and by preventing key blocks from becoming loosened so that the strength and integrity of the rock mass is maintained. Shotcrete can be used for lining tunnels. For example, a layer 150 mm thick, around a tunnel 10 m in diameter, can safely carry a load of 500 kPa, corresponding to a burden of approximately 23 m of rock, more than has ever been observed with rock falls. When combined with rock bolting and reinforcing wire mesh, shotcrete has proved an excellent temporary support for all qualities of rock. In very bad cases, steel arches can be used for reinforcement of weaker tunnel sections. A classification of rock masses is of primary importance in relation to the design of the type of tunnel support. Lauffer’s (1958) classification represented an appreciable advance in the art of tunnelling since it introduced the concept of an active unsupported rock span and the corresponding stand-up time, both of which are very relevant parameters for determination of the type and amount of primary support in tunnels. The active span is the width of the tunnel or the distance from support to the face in cases where this is less than the width of the tunnel. The relationships found by Lauffer are given in Figure 9.16. Bieniawski (1974, 1989) maintained that the uniaxial compressive strength of rock material; the rock quality designation; the spacing, orientation and condition of the discontinuities; and groundwater inflow were the factors that should be considered in any engineering classification 485
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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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Page 942: Table 9.1. Rippability rating chart
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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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532 Table 9.8. Typical compaction c
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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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