Abstract
The cohesion c and internal friction angle φ play different roles in the progressive failure process of the slope, which indicates that the reduction factors kc and kφ should be different in the calculation. Based on this, the program of double strength reduction factor method was compiled with FISH language, in order to study its application in the rock slopes under different distributions of weak interlayer, and the following conclusions were drawn: (1) the plastic zone calculated by double strength reduction factor method is generally distributed in the weak interlayer, which is basically consistent with the calculation result of the traditional method; (2) the degree to which c and φ play a role is related to the inclination angle of the bottom sliding surface of the unstable block θ. If θ < 45°, φ will play a greater role. If θ ≥ 45°, c will play a greater role; (3) according to the “Pan’s principle,” the matching reduction principle of “kc > kφ” can be adopted when θ < 45°, and the matching reduction principle of “kc < kφ” can be adopted when θ ≥ 45°; (4) the definition of the comprehensive safety factor “K2” in the text is more suitable for the application of double strength reduction factor method in the stability analysis of rock slopes. The applicability of the above conclusions is verified by an actual engineering.
Highlights
At present, the commonly used methods for the stability analysis of slopes mainly include limit equilibrium method, strength reduction method, and overload method, etc., all of which have certain advantages and disadvantages [1,2,3,4,5]. e limit equilibrium method is simple and clear in calculation, but the sliding surface should be assumed in advance before calculation, while the strength reduction method and overload method make up for this defect, but the calculation efficiency of the strength reduction method is low, and the attenuation process of rock and soil strength parameters cannot be reflected in the overload method, which is not consistent with the actual engineering
The concrete application of double strength reduction factor method in the stability analysis of rock slopes was studied based on self-programmed program, and its applicability was verified through engineering examples
E following conclusions were drawn: (1) e rock slope generally slides along the plastic zone formed by the weak interlayer zone, and the plastic zone obtained by the traditional strength reduction method and the double strength reduction coefficient method is basically the same
Summary
The commonly used methods for the stability analysis of slopes mainly include limit equilibrium method, strength reduction method, and overload method, etc., all of which have certain advantages and disadvantages [1,2,3,4,5]. e limit equilibrium method is simple and clear in calculation, but the sliding surface should be assumed in advance before calculation, while the strength reduction method and overload method make up for this defect, but the calculation efficiency of the strength reduction method is low, and the attenuation process of rock and soil strength parameters cannot be reflected in the overload method, which is not consistent with the actual engineering. Erefore, the double strength reduction factor method was applied to the stability analysis of this type of rock slopes, and the matching reduction principle and the definition of the comprehensive safety factor applicable to it were studied. It can reflect the respective roles and degrees of c and φ in the progressive failure process of the slope, and fill the vacancy of double strength reduction factor method in the engineering application, which is very necessary. This paper used the built-in FISH language in the software FLAC3D to compile the program of double strength reduction factor method and calculated the reduction factor of cohesion, reduction factor of internal friction angle, and three typical comprehensive safety factors of the rock slope under different distributions of weak interlayer. e matching reduction principle and the definition of comprehensive safety factor for such type of rock slopes were studied and established
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