Engineering Geology

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Chapter 9 Uplift pressure acts against the base of a dam and is caused by water seeping beneath it that is under hydrostatic head from the reservoir. Uplift pressure should be distinguished from the pore water pressure in the material beneath a dam. The uplift pressure on the heel of a dam is equal to the depth of the foundation below water level multiplied by the unit weight of the water. In the simplest case, it is assumed that the difference in hydraulic heads between the heel and the toe of the dam is dissipated uniformly between them. The uplift pressure can be reduced by allowing water to be conducted downstream by drains incorporated into the foundation and base of the dam. When load is removed from a rock mass on excavation, it is subject to rebound. The amount of rebound depends on the modulus of elasticity of the rocks concerned, the larger the modulus of elasticity, the smaller the rebound. The rebound process in rocks generally takes considerable time to achieve completion and will continue after a dam has been constructed if the rebound pressure or heave developed by the foundation material exceeds the effective weight of the dam. Hence, if heave is to be counteracted, a dam should impose a load on the foundation equal to or slightly in excess of the load removed. All foundation and abutment rocks yield elastically to some degree. In particular, the modulus of elasticity of a rock mass is of primary importance as far as the distribution of stresses at the base of a concrete dam is concerned. What is more, tensile stresses may develop in concrete dams when the foundations undergo significant deformation. The modulus of elasticity is used in the design of gravity dams for comparing the different types of foundation rocks with each other and with the concrete of the dam. In the design of arch dams, if Young’s modulus of the foundation has a lower value than that of the concrete or varies widely in the rocks against which the dam abuts, then dangerous stress conditions may develop in the dam. The elastic properties of a rock mass and existing strain conditions assume importance in proportion to the height of a dam since this influences the magnitude of the stresses imparted to the foundation and abutments. The influence of geological structures in lowering Young’s modulus must be accounted for by the provision of adequate safety factors. It should also be borne in mind that blasting during excavation of foundations can open up fissures and joints that leads to greater deformability of the rock mass. The deformability of the rock mass, any possible settlements and the amount of increase of deformation with time can be taken into consideration by assuming lower moduli of elasticity in the foundation or by making provisions for prestressing. <strong>Geology</strong> and Dam Sites Of the various natural factors that directly influence the design of dams, none is more important than the geological, not only do they control the character of the foundation but they also 513
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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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Page 1042: Chapter 9 on the upstream side or a
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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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