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Yao H.-Y.,Sinosteel Maanshan Institute of Mining Research | Yao H.-Y.,Hefei University of Technology | Zhu D.-Y.,Hefei University of Technology | Zhou Y.-X.,Sinosteel Maanshan Institute of Mining Research | Liu X.-T.,China Three Gorges University
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

A number of integrated and pre-existing hole sandstone specimens under cyclic drying and wetting have been prepared and tested under compression with meso-mechanical testing system. The processes of crack initiation, propagation and failure behaviors of specimens are observed by microscope. After several cyclic times of drying and wetting, the cracks initiate at lower load level, and the initial cracks generally are tensile cracks. The crack propagation in integrated specimens is three-dimensional at random, but in the specimens with pre-existing hole, the cracks start to grow at the hole wall firstly. In specimens with pre-existing hole, shearing cracks initiate from the compressive stress concentrated areas of the hole wall under natural state; on the contrary, tensile cracks may initiate at the central zone of tensile stress under cyclic drying and wetting. Moreover, the cracking progress is more complicated and its rupture form is multiple. Compared with natural specimens, the specimens under cyclic drying and wetting become more ductile, and their strength parameters are lower. Source

Lu K.-L.,Hefei University of Technology | Lu K.-L.,Sinosteel Maanshan Institute of Mining Research | Zhu D.-Y.,Hefei University of Technology | Gan W.-N.,Hefei University of Technology | Zhou Y.-X.,Sinosteel Maanshan Institute of Mining Research
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2013

By obtaining the normal stresses over slip surface and considering the equilibrium conditions of the whole sliding body, a three-dimensional slope stability analysis method is proposed, which satisfies four equilibrium conditions and accommodates to slip surfaces of any shape. The functions of inter-column force are assumed and the distribution function of the normal stress over slip surface containing three undetermined parameters is obtained based on the force equilibrium conditions of typical discretized column. Equilibrium equations are established considering the equilibrium conditions of the whole sliding body, and then 3D factor of safety is derived using the numerical and analytic methods. Some examples are given to verify the proposed method. The results show that the proposed method is more reliable compared with several other 3D slope stability analysis methods. Finally, this method has been successfully used in the stability analysis of slope on Jin Ping-zi Mountain. The present 3D slope stability analysis method can be widely used by geotechnical engineers in the design of slopes and treatment of landsides for its easy computing and programming. Source

Gan W.,Hefei University of Technology | Gan W.,Guangxi Water and Power Design Institute | Zhu D.,Hefei University of Technology | Wu Y.,Hefei University of Technology | And 5 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2014

In order to study the strength characteristics of red sandstone fine-grained soils and the effects of moisture content and degree of compaction on shear strength, quick shear tests were carried out under different moisture contents and degrees of compaction. The results showed that under a certain degree of compaction, the cohesive strength which showed a quadratic parabola relationship with moisture content was increased first and then decreased with the increase of moisture content, while the internal friction angle was decreased with power-function. The saturated cohesive strength and internal friction angle showed different amplitude increase with the degree of compaction under a certain moisture content. Compared with internal friction angle, the cohesive strength was affected more significant by moisture content and the degree of compaction. The present results can provide references to the red sandstone roadbed or dam construction engineering and slope stability analysis etc. Source

Li Y.,Institute of Geotechnical Engineering | Li Y.,Sinosteel Maanshan Institute of Mining Research | Yang Y.-S.,Institute of Geotechnical Engineering | Yang Y.-S.,Sinosteel Maanshan Institute of Mining Research | And 3 more authors.
Yantu Lixue/Rock and Soil Mechanics | Year: 2013

The plane strain analysis method was widely adopted in evaluation of dump slope stability. It is embarrassed that, dumps sometimes destroyed but the safety factor was go over the allowable value. Regardless of those issues had been mentioned frequently, such as mechanical parameters, constitutive model and so on, the spatial clamp effect of convex and divergent effect of concave and slide-body-end effect are also play vital roles in analysis of slope stability. For those reasons, proceed from conditions of plane elevation data, geological section, drilling data and others, Kriging interpolation method, which can obtained a smooth effect of interpolation, was adopted, and then the three-dimensional (3D) geological model of dump was built. Then an interface program, wrote by FISH, was used to import the 3D-model into FLAC3D to discretization and calculation. In this way, the issues mentioned above can be figure out efficiently. Trinity function include 3D geological modeling, model visualization, geotechnical analysis was achieved in a simple and highly efficient way. An example of Jianshan seventh dump of Lanjian Iron Mine, Pangang Group co. Ltd. of China, was concerned by previous mean, 3D stress-strain analysis was carried out, 3D global safety factor was also calculated by 3D strength reduction method. It turned out that the results was accordant to the field investigation and plane strain analysis conclusion. Results calculated by the 3D geological model cannot be affected by dump spatial effect and slide-body-end effect, the general stress-strain pattern, which obtained from the method, can be instructive and meaningful to production management for open-mine dumps. Source

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