Instability Mechanism and Stability Analysis of Slope with Weak Soil Layer
by using the finite element strength reduction method and the rigid body limit equilibrium method,the instability mechanism and stability of a slope with soft soil layer were studied,and the influence of soft soil layer on the instability mode and stability of the slope was analyzed.The result shows that,with the decrease of the strength of the weak soil layer in the slope,the stability of the slope is on the decline.When the strength of the soft soil layer is greater than or less than 0.6 times the strength of the surrounding soil,the slope is the circular arc instability mechanism and the broken line instability mechanism,respectively.When the rigid body limit equilibrium method is used for stability analysis,if the properties of the weak soil layer and the surrounding soil layer are quite different,the instability mechanism of the slope shall be analyzed,and followed by the slope stability analysis.The finite element strength reduction method does not need to analyze the instability mechanism of the slope in advance,and has obvious advantages over the rigid body limit equilibrium method.Taking the slope with soft soil layer of a secondary highway as an example,the stability of the slope is analyzed by the broken line sliding calculation method,and verified by the finite element strength reduction method.
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