Soil Mechanics for Unsaturated Soils phần 10 ppsx

... analysis Soil mechanics: definition 1 historical development 16 Soil profiles, residual soils 10 Soil structure 43 44 278 285 401 metastable structure 348 417 430 microstructure 10 stable ... Driving potential 107 108 110 119 121 air phase 117 water phase 108 Dry soils 30 34 45 46 E Earth dam 3 219 329 Earth pressure 297 298 301 active 7 298 301 302 303...

Ngày tải lên: 09/08/2014, 23:20

... be performed for an unsaturated soil after considering the state of stress at a point in the soil. 3.2.1 Equilibrium Analysis for Unsaturated Soils There are two types of forces ... oligotrophous peat soil 0.6 - 10- 1 i io 102 103 io4 10& apos; io6 Matric suction, (u. - u,) (kPa) Figure 3.7 Soil- water characteristic cuwe for some Dutch soils...

Ngày tải lên: 09/08/2014, 22:24

... on Expansive Soils, Dallas, Texas ( 1992). There is also the need for reliable engineering design as- sociated with compacted soils, collapsing soils, and resid- ual soils. Soils that collapse ... true for satu- rated soils, it has not been the case for unsaturated soils. Difficulty has been experienced in extending classical soil mechanics to embrace unsaturated...

Ngày tải lên: 09/08/2014, 22:23

... the driving potential for flow in that phase. This is equally true for saturated and unsaturated soils. 5.1.1 Driving Potential for Water Phase The driving potential for the flow of water ... - uw), curve. Soils with a wide range of pore sizes have a small value for h. The more uniform the distribution of the pore sizes in a soil, the larger is the value for...

Ngày tải lên: 09/08/2014, 22:24

... fB,. (8 .100 ) (8.99) and (8 .100 ) show that for an elastic, (8 .105 ) Equations (8 .104 ) and (8 .105 ) have the same form as the pore-water pressure generation equation for Saturated soils ... with the force equilibrium equations. Formulation for Two-Dimensional Flow The following derivation is for the general case of a her- erogeneous, anisotropic, unsatu...

Ngày tải lên: 09/08/2014, 22:24

... saturated soils has commonly been estimated using this procedure (Bishop and Henkel, 1962). This theory has been extended to embrace unsaturated soils testing. For unsaturated soils, it ... saturated soils [i.e., Fq. (9.1)]. Therefore, the shear strength equation for saturated soils, Eq. (9.1), is applicable when the pore-water pres- sures are negative, provided the so...

Ngày tải lên: 09/08/2014, 22:24

... on engineering struc- tures by unsaturated soils. Pressures exetted by expansive soils have been of concern, but a general earth pressure theory for these soils has only recently been proposed. ... - 100 100 97 99 86.5 1330 1800 33.7 17 1330 1 800 29 13.6 8.5 2.8 4 4 2.8 x 10- ~ 2.8 x 10- ~ 2.5-3 2-3 32 15 100 94 48 17 1 910 11.5 1 910 9.2 0.7...

Ngày tải lên: 09/08/2014, 22:24

... AMONG VOLUMETRIC DEFORMATION COEFFICIENTS The constitutive equations or surfaces for unsaturated soils have been formulated and presented in three forms. In the elasticity form, the E, If, ... small deformations. The semi-empirical approach is more commonly used in conventional soil mechanics, and is used herein to formu- late the constitutive relations for unsaturate...

Ngày tải lên: 09/08/2014, 23:20

... 388 13 MEASUREMENTS OF VOLUME CHANGE INDICES 10- 1 IOD 10 102 103 104 106 108 Figure 13.30 Soil- water characteristic curves for London clay (from Croney and Coleman, 1954). ... REQUIRED FOR THE FORMULATION The one-dimensional consolidation equation for saturated soils [Le., Eq. (15. l)] can be derived by satisfying the con- tinuity requirement for a satura...

Ngày tải lên: 09/08/2014, 23:20

... 16.1 UNCOUPLED TWO-DIMENSIONAL FORMULATIONS 449 106 - E s 2 107 0 - p 108 . - 109 - g 10 0 : 10 8 =: 9) \ a - - 1 k 10 2 ‘ ’ ’ ‘ Pore-water pressure head, ... volume. For a homogeneous soil, the porosity, n, is also equal to the area ratio of each phase Figure B.2 Components for total equilibrium in the y-direction for an unsaturated soil ....

Ngày tải lên: 09/08/2014, 23:20