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Study on Coarse Grained Soil Slope Stability Based on Model Test and Numerical Analysis

Author: WangKeDong
Tutor: ZhuJunGao
School: Hohai University
Course: Geotechnical Engineering
Keywords: Coarse grained soil Slope stability Model test Limit equilibrium method Finite Element Method Strength Reduction Instability criterion Slip surface Equivalent shear strain
CLC: TU411
Type: Master's thesis
Year: 2006
Downloads: 314
Quote: 3
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Abstract


Previous slope stability analysis are basically carried out based on cohesive soil slope, research more. Coarse grained soil, cohesive soil differences in the strength and deformation characteristics, soil slope instability, deformation and failure of law and the sliding surface morphology and cohesive soil slope some different, few people specialized studies in this regard, it is worth The in-depth study. Soil slopes before the overall damage occurs, often accompanied by considerable vertical settlement and lateral deformation limit equilibrium method for failing to consider the deformation of the slope can not accurately reflect the stability of the slope, the calculation result is error; limited Strength Reduction is a promising method of slope stability analysis, the key issues of the method is the determination of the critical state, namely, how to define the instability criterion, there are some applications and existing instability criterion flaws. Based on the above analysis, the paper carried a the indoor coarse-grained soil slope model test study of coarse grained soil slope deformation and instability of the law and its instability when the morphological characteristics of the slip surface; while taking advantage of the non-linear elastic finite element method simulation model slope limit state deformation characteristics and instability when the sliding surface morphology; using the finite element method to study the influence of deformation of soil slope stability; Finally, the finite element strength reduction method in the coarse-grained soil slope The research on the application. Specific research results are as follows: (1) the use of the model test equipment width of 6 different slope ratio and pressure plate set of coarse-grained soil slope model test, model soil slopes slope feature points displacement law, Slope within displacement field distribution and occurrence of instability and failure slip surface morphological characteristics; (2) using the traditional limit equilibrium method to calculate the ultimate load of the top of the hill when the model slope limit state with a non-linear elastic finite element method simulation ultimate load of the model soil slopes deformation failure characteristics and slip surface morphology, and compare the results obtained with the model test to verify the reliability of the finite element method; (3) the use of a plane strain finite element method calculation of soil the slope of the stress field, and then use the the arc search method to study the variation of soil slope stability under different deformation conditions, revealed the law of deformation for Slope Stability; (4) strength reduction finite element method analysis side The slope of the key problems is the determination of the critical state. Based on the model test of coarse-grained soil slope deformation damage characteristics, combined with a simple coarse-grained soil slope example, strength reduction under the indicators of the the linear strength index and nonlinear intensity, strength reduction in maximum equivalent shear strain e qmax and other five variables with the reduction factor F sr variation, proposed F sr to e < sub> qmax curve \

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Soil Test > Laboratory tests (indoor soil test )
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