SOIL MECHANICS - CHAPTER 11 doc

... solution (11. 4) with respect to r. This gives dh dr = Q 0 2πkHr . (11. 6) This means that the specific discharge in r-direction is, using Darcy’s law, q r = −k dh dr = − Q 0 2πHr . (11. 7) The total ... all conditions, and therefore must be correct. Arnold Verruijt, Soil Mechanics : 11. FLOW TOWARDS WELLS 71 point just between the two wells? 11. 2 A well in a circular area of radius 100...

Ngày tải lên: 05/08/2014, 23:24

... Engineers (KIvI), with about 1000 members. 1.3 Why Soil Mechanics ? Soil mechanics has become a distinct and separate branch of engineering mechanics because soils have a number of special properties, ... discipline Soil mechanics is the science of equilibrium and motion of soil bodies. Here soil is understood to be the weathered material in the upper layers of the earth’s c...

Ngày tải lên: 05/08/2014, 23:24

... the soil. In later chapters a pro- cedure for the calculation of these settlements will be presented. For this purpose first the relation be- tween effective stress and deformation must be consid- ered. Subsidence ... the soil surface. In this case there are two possibilities, depending upon the size of the particles in the soil. If the soil consists of very coarse material, the groundwat...

Ngày tải lên: 05/08/2014, 23:24

... of the hydraulic conductivity of various soils is given in Table 7.1. 45 Arnold Verruijt, Soil Mechanics : 7. PERMEABILITY 47 7.2 Falling head test For soils of low permeability, such as clay, ... that very small quantities of flowing water can be measured. Arnold Verruijt, Soil Mechanics : 7. PERMEABILITY 46 Type of soil k (m/s) gravel 10 −3 − 10 −1 sand 10 −6 − 10 −3 silt 10 −8 − 1...

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... who wishes to know the effective stresses, so that the deformations of the soil can be calculated. Arnold Verruijt, Soil Mechanics : 10. FLOW NET 66 From the flow net the force on the particles can ... precisely in x-direction if the value of Ψ is constant in x-direction. This can be checked by noting that the condition q z = 0 can only be satisfied if ∂Ψ/∂x = 0. Similarly, the flow is in z...

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... that t = 0 : p = σ 1 + nβ/m v . (15.22) Arnold Verruijt, Soil Mechanics : 15. CONSOLIDATION 91 including the influence of the weight of the soil layers as a given initial state, and to regard all ... account. It follows from (15 .11) and (15.12), assuming that the hydraulic conductivity k is constant, ∂ε vol ∂t = −nβ ∂p ∂t + k γ w ∂ 2 p ∂z 2 . (15.13) Arnold Verruijt, Soil Mechanics...

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... Arnold Verruijt, Soil Mechanics : 21. TRIAXIAL TEST 127 σ 3 = σ c , (21.4) It should be noted that the stresses in ... of the circle will gradually in- crease, and if the force is sufficiently large the circle will touch the straight lines indicating the Coulomb criterion, the Mohr-Coulomb envelope. In that situation ... φ may vary from 15 ◦ to 30 ◦ . For the determination of c and φ of cla...

Ngày tải lên: 06/08/2014, 01:20

... coefficients A and B in this case ? 24.3 Dense soils tend to expand in shear (dilatancy). Loose soils tend to contract (contractancy). Do you think that the soil in problem 23.1 is dense, or loose? 24.4 ... pressure increases by 20 kPa. If the soil were perfectly elastic, what would then be the increment of the pore pressure? Chapter 24 PORE PRESSURES In the previous chapters the main pri...

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... Verruijt, Soil Mechanics : 25. UNDRAINED BEHAVIOR OF SOILS 150 25.2 For a certain soil it is known that c = 20 kPa and φ = 30 ◦ . An undrained analysis must be made for a case of a soil in which ... increase after the construction. As an example one may Chapter 25 UNDRAINED BEHAVIOR OF SOILS If no drainage is p oss ible from a soil, because the soil has been sealed off, or because...

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... agreement with the values obtained in Chapter 24. Arnold Verruijt, Soil Mechanics : 26. STRESS PATHS 152 other parameters (such as the value of σ 2 ) too, so that the Mohr-Coulomb failure criterion should ... of a soil, because the Mohr-Coulomb failure criterion can be formulated in σ and τ, but for smaller stresses it may be a first approximation only. Actually, even the failure criter...

Ngày tải lên: 06/08/2014, 01:20