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The shear strength characteristics of two representative kinds of soils from Shanghai soft soil strata in original state, freeze-thaw and secondary freeze-thaw state were tested in laboratory, and the results were analyzed. The changing characteristics of cohesion and internal friction angle were found. The different effects of second freeze-thaw cycles on the two kinds of soil were gained. The results...
DRS-1 high normal stress direct and residual shear apparatus was used to study the direct shear mechanical characteristics of the sand with different granular diameter under different normal stress. The results show that for three kinds of sand (coarse sand, medium sand and fine sand) the curve of shear stress-shear displacement presents strain softening when the normal stress, σ, is less than, or...
With the development of FEM and computation methods, the study and use of shear strength reduction technology in slope stability analysis is becoming increasingly popular. In this paper, the effect of elastic modulus and poisson ratio on the safety factor of the slope as well as the width of it's plastic zone domain (zone) is examined by using three criteria based on SSR technique.
For mastering the strength and deformation properties of sand under high pressure, DRS-1 high pressure direct shear test system was used in shear test of Fujian standard sand under 12 to 15 MPa. Through analysis of the test results, we obtained that shear properties of standard sand under high pressure show strain hardening, it is consistent with Duncan-Chang hyperbolic model. There is a proportional...
The term of quasi-saturated soil is not currently used in the literatures. However this type of soils is distributed extensively, such as the soils formulated by air sparging as a remediation technology for treatment of contaminated aquifers. In engineering, quasi-saturated soils are usually considered as saturated soils. Nevertheless the characteristic of quasi-saturated soils is very different from...
Shear strength of granulated rubber and loess mixtures were investigated through direct shear test to evaluate the possibilities of the used tire as a lightweight fill material in geotechnical engineering. Test results indicated that the shear strength increased dramatically, at the content range of approximately 30%, higher than either pure granulated rubber aggregates or pure compacted loess. The...
The geocell was used for erosion control of a cutting rocky slope by vegetation, and the stability analysis method of soil-geocell was proposed based on the theory of limit equilibrium and field experience. The factors effecting on the stability of geocell were analyzed. The results show that the failure modes of geocell are determined by the shear strength of geocell junction under the stress applied...
Rock-soil aggregate (RSA) is a kind of special geo-engineering material which is widely distributed in China. Discontinuity and heterogeneity are the main characteristics represented by RSA because of its internal complicated structure. PFC (particle flow code) 3D from Itasca is employed for the numerical study of RSA based on discrete element method (DEM) because of its obvious discontinuity. A new...
In this paper, we investigate the influence on shear strength of the roots of four typical plants which can fix the soil in coal mining subsidence area by direct shear tests ,and the shear strength of the root soil composite .The results indicate that with the same root diameter (1.25 mm) , Sabina valgsris Ant., Salix psammophila, Caragannmicrophylla Lam. Artemisia sphaerocephala Krasch are more intensive...
The stability of dam slope during rapid drawdown of reservoir water level was computed using slipping arc stability analysis based on finite element computation according to unsaturated soil shear strength theory in combination with a specific reservoir. In the analysis, the dissipating process of pore-water pressure was simulated using unsaturated-unstable seepage theory and the impact of matrix...
This paper represents the first stage in developing an algorithm for extracting the values of the undrained shear strength from the deceleration records of the STING penetrometer. A brief summary of the STING penetrometer and its processing algorithm is given. Then, we focus on the direct simulations of the probe velocity decay with depth, using simple soil constitutive models in a fully-dynamic elasto-plastic...
In this paper, cantilever support system of foundation pit is analyzed by ANSYS which is the large scale general software of finite element analysis, the stress and displacement of foundation pit and support system are available from ANSYS. According to a foundation pit project in Handan, on the basis of the finite element analysis results, traditional method is adopted to design and calculate the...
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