Slope safety coefficient calculation method considering cohesive force and internal friction angle contribution degree

Abstract

The invention discloses a slope safety coefficient calculation method considering cohesive force and internal friction angle contribution degree. According to the calculation method, the influence degree and the influence mechanism of the cohesive force and the internal friction angle on the slope stability are described, the form is simple and the physical significance is clear. The stability calculation result obtained through the method has quite high coincidence degree with the calculation result obtained through an existing method, it is proved that the provided double-reduction slope comprehensive safety coefficient defining method is reasonable and accurate, and problems and defects existing in an existing double-reduction slope comprehensive safety coefficient defining method can be effectively solved. According to the calculation method, the double-reduction slope comprehensive safety coefficient calculation method capable of reflecting contribution of the cohesive force and the internal friction angle to slope stability is provided, existing slope examples are analyzed through the method, and high calculation precision shows the reasonability and the correctness of the new calculation method.

Description

technical field [0001] The invention belongs to the technical field of slope stability analysis, and in particular relates to a calculation method of a slope safety factor considering the contribution degree of cohesion force and internal friction angle. Background technique [0002] Safety factor is usually used to quantitatively describe slope stability. With the improvement of computer numerical capabilities, the limit equilibrium method LEM and strength reduction method SRM numerical simulation methods have become the main methods for calculating the safety factor of slopes. The slope safety factor calculated by the limit equilibrium method LEM is usually based on the method of bending moment, force or shear strength balance of the slip surface at the time of failure. On this basis, combined with the slice method, various types of Various limit equilibrium methods such as Bishop's method, Janbu's method, Morgenstern-Price method and Spencer's method and others. Althoug...

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Problems solved by technology

At present, most of the existing double reduction methods are based on the study of the decay rate and decay path of the cohesion force and internal friction angle in the process of progressive failure of the slope, and then put forward the corresponding reduction method, but there is not enough research to determine the expression of the comprehensive safety factor. , and there are few reports considering the contribution of the two to slope stability

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