Soil Mechanics for Unsaturated Soils phần 9 doc

... describe heat transfer in soils (Jame and Norum, 198 0; Fredlund and Dakshanamurthy, 198 2; Wilson, 199 0). The form of the heat flow equation proposed by Wilson ( 199 0) is as fol- lows: ... (Philip and de Vries, 195 7; de Vries, 197 5; Dakshanamurthy and Fredlund, 198 1; Wilson, soil (kg * m/kN * s). 199 0): (16.61) where CY = tortuosity factor for...

Ngày tải lên: 09/08/2014, 23:20

... of an unsaturated soil can be al- tered using a one-dimensional oedometer (M.I.T., 196 3; Barden et al., 196 9) or a triaxial permeameter cell (Ma- tyas, 196 7; Barden et ul., 196 9; Barden ... diffision for air through var- ious soils are presented in Chapter 2. There is need for fulther studies which measure the coefficients of diffision for air through the...

Ngày tải lên: 09/08/2014, 22:24

... the major causes for the occurrence of collapse (Matyas and Radhakrishna, 196 8; Escario and Sdez, 197 3; Cox, 197 8; Lloret and Alonso, 198 0; Maswoswe, 198 5). Tadepalli ( 199 0) conducted collapse ... a semi-logarithmic scale (Schmertmann, 195 5; Holtz and Gibbs, 195 6; Gil- Christ, 196 3; Noble, 196 6; Lambe and Whitman, 197 9; Lidgren, 197 0; Chen, 197 5). The slope of the re...

Ngày tải lên: 09/08/2014, 23:20

... components 64 64 64 66 67 67 68 69 70 70 70 70 71 73 74 77 77 77 79 80 81 82 83 84 86 86 86 88 88 90 91 93 95 97 97 99 99 100 104 105 107 1 07 108 110 ... technology for unsaturated soils has been slow to develop (Fredlund, 197 9). Not until the research at Imperial College in the late 195 0’s did the concepts for understanding unsat...

Ngày tải lên: 09/08/2014, 22:23

... 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 ... and shear strength testing of unsaturated soils (Bishop and Don- ald, 196 1; Gibbs and Coffey, 196 9b; Fredlund, 197 3; Ho and Fredlund, 198 2a; Gan et al. 198 8). The use of the...

Ngày tải lên: 09/08/2014, 22:24

... These formulations are similar to those derived for saturated soils (Lambe and Whitman, 197 9). 8.2 .9 Triaxial Loading Triaxial loading conditions are illustrated in Fig. 8.12. Uniform ... pressure generation equation for Saturated soils under triaxial loading conditions (Skempton, 195 4, Lambe and Whitman, 197 9). The equations have also been pro- c 9 - =...

Ngày tải lên: 09/08/2014, 22:24

... Table 9. 1, for soils from various geographic locations. 0 Net normal stress, (a - u.) Figure 9. 18 Extended Mohr-Coulomb failure envelope for unsaturated soils. 248 9 SHEAR ... unsaturated soils testing. For unsaturated soils, it is necessary to consider impeded flow through the high air entry disk at the base of 228 9 SHEAR STRENGTH THEORY a...

Ngày tải lên: 09/08/2014, 22:24

... 1 70 .94 37.86 71.28 176 .95 72.83 23.45 72.55 16.62 73.73 0.85 2 71. 29 176. 89 71.58 314.7 72.84 79. 04 72.61 60. 69 72.58 33. 89 3 71.58 315.25 71 .99 453.53 72.68 448.05 72. 59 120.3 72. 59 78.07 ... 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...

Ngày tải lên: 09/08/2014, 22:24

... af. 1%9a). 12.5 RELATIONSHIP AMONG VOLUMETRIC DEFORMATION COEFFICIENTS The constitutive equations or surfaces for unsaturated soils have been formulated and presented in three forms. ... 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 unsaturated s...

Ngày tải lên: 09/08/2014, 23:20

... conductivity 95 97 474 475 Thermal conductivity sensors 54 67 104 AGWA-II 97 98 99 100 calibration of 97 MCS 6000 96 97 99 response times of 99 theory of operation 97 typical results 99 Thermocouple ... 375 381 384 386 388 3 89 392 394 395 400 405 410 411 free swell oedometer tests 374 375 388 3 89 390 392 393 394 396 399 400 401 405 procedure 378 str...

Ngày tải lên: 09/08/2014, 23:20