Applied Mechanics and Materials Vols. 353-356

Abstract: This paper introduces the present research and observes the future research of CFG pile composite foundation.

Abstract: It is important to study the effect of gradient of landfill side slope on the tensile force of geosynthetic liner in order to assure adequate performance and to increase the landfill volume. In this research, for the landfill liner composed of upper protective mat, barrier sheet and bottom protective mat, finite Element Analysis, in which the gradient of modelled landfill side slope was changed from 1:2.0 to vertical, were conducted to evaluate the effect of side slope gradient on the tensile force of geosynthetic liner. In the FEM analysis, the stress-strain relationship of ash and friction stress-relative displacement relationship of joint element were modelled by hyperbola. The results of centrifugal model experiments were also used to verify the FEM analysis. As a conclusion, the tensile force of geosynthetic liner at the slope crest decreases with increasing side slope gradient from 1:2.0 to 1:0.2 and then it increases slightly as the gradient increases up to vertical.

Abstract: Numerical simulation was conducted to study the particle breakage of rock in rolling compaction (RC) test based on discrete element method (DEM). Different shapes of particles were formed to represent the real particle shape. A quantitative analysis method of particle breakage was proposed according to the grading curve before and after compaction. The numerical results had a good agrrement with the field test, which indicated that the method adopted in this paper was feasibile and could consider the influence of the particle shape on the particle breakage in RC test.

Abstract: Borehole sampling and laboratory soil characterizations provide accurate engineering properties, yet it is time-consuming and expensive. Geo-electrical survey is an attractive tool for delineating subsurface properties without soil disturbance. The primary objective of the current research work is to investigate the relationship between electrical resistivity and plasticity index of soil. The results from electrical resistivity tests (field and laboratory) and Atterburg limit tests were analyzed to understand the relationship between electrical resistivity and plasticity index of soil. Plasticity index have a significant correlation with field and laboratory electrical resistivity values for all soil samples. It was found that silty sand soil samples are characterized by higher plasticity index and lower resistivity values whereas sandy soil samples have lower plasticity index and higher resistivity values.

Abstract: In Consideration of the nonlinear of the soil and the interface between pile and soil, the spatial axisymmetry finite element model is established. Based on the model, the paper offers the Superposition Method to calculate proper pile length in the self-weight collapse loess , and gets the following deduction: when the upper and lower parts of soils skin friction has the same regularity, added pile length L has nothing to do with the skin friction distribution, but is related to ultimate friction resistance. Practical application shows that the method is effective and can be referenced in engineering practice.

Abstract: A coupled model of heat-moisture flow with Penman-Wilson evaporation boundary condition is used for simulating evaporation processes in three 1D vertical columns with different dry densities. The simulation results show that unsaturated evaporation process has three stages, i.e. constant-rate stage, falling-rate stage and residual stage. The depth of drying front has a great influence on soil actual evaporation. The actual evaporation decreases as the drying front advancing downward. The total evaporation decreased with the increase of soil dry density. The velocity of drying front advancing in the soil of higher dry density is faster than that of lower dry density.

Abstract: Development of slope disintegration is close to soil mechanic characteristics such as shear strength indices. Soil grain diameter and water content were tested. Soil direct shear test was conducted to analyze the relationship between shear strength indices and the influencing factors. The experimental data indicate that clay content and the range affect soil cohesion value and the scope. Soil cohesion increases with bulk density before 1.6g/cm³. But it decreases when the bulk after that. The results could provide a scientific basis for control of slope disintegration.

Abstract: Taking the granite residual soil of Fujian Province as an example, this paper investigated the humidity migration law of the granite residual soil pillar embankment under the co-influence of temperature and capillary based on the finite difference technology. The results show that the temperature and humidity of the surface of the soil pillar take on the linear downward trend under different temperature gradients, and the larger the temperature gradient is, the wider the falling range will be. The temperature and humidity migration volume of the hot end of the soil pillar presents the linear variation along with the increase of the average temperature. The change of the temperature field of the residual soil pillar is mainly influenced by the temperature gradient. The humidity migration volume and the rising height of the capillary water are obviously more strongly influenced by the average temperature than the temperature gradient. Therefore, it is necessary to study the influence of the temperature-humidity coupling on humidity migration for the low embankment of the high underground water level in the hot-humid area.

Abstract: As one of the most familiar and serious danger geological hazard. Slope has caused huge life and property losses of our country and people. So it is necessary to analyze the stable state when facing serious landslide hazards, and giving a reasonable evaluation. Taking Suoertou landslide as an example In this paper, on the basis of investigation and study, general situation of Suoertou landslide is introduced, then the stable state is analyzed, calculated and evaluated, the conclusion is a depend basis for later treatment.

Abstract: Taking section W400 of Fushun west open-pit coal mine for the research, the interface model of fracture zone and surrounding rock was established. FLAC^3D is used to analysis the influence of excavation and backfill of open-fit coal mine to the slope stability and deformation. The numerical results and analysis show that: (1) when the open-pit coal mine slope is excavated to final production line, the safety coefficient is 2.98, with the excavation, the deformation of the Fushun No.1 Refinery Factory area increases. (2) With the increase of backfilling, the slope coefficient increases to 3.32, this will reduce the deformation of the Fushun No.1 Refinery Factory area. Furthermore, the positions of the dangerous slip surface and serious deformation part of factory area should be regards as key areas. These conclusions could provide technical basis for the stability analysis of Fushun west open-pit coal mine.