Method for evaluating stability and reliability of soil slope of roadbed

Abstract

The invention discloses a roadbed soil slope stability and reliability evaluation method. The method comprises the following steps: S1, obtaining roadbed soil slope parameters; s2, determining a slope stability safety factor, a slope material effect factor, a first slope geometric effect factor and a second slope geometric effect factor; s3, determining slope stability and reliability indexes; and S4, evaluating the stability and reliability of the roadbed soil slope. The rapid evaluation method for the stability and reliability of the roadbed soil slope disclosed by the invention has a reference value for improvement of roadbed engineering construction and maintenance. Based on geometric and material parameters of a roadbed soil slope measured and obtained in engineering, a stability safety coefficient is obtained according to a Fellenius limit equilibrium method, a corresponding effect factor is determined according to a slope material and the geometric parameters, and according to a disclosed reliable index estimation model, a reliable index capable of considering the influence of soil strength parameter variability is obtained. And a reliability index corresponding to the safety factor.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering slope stability analysis, and particularly relates to a method for evaluating the stability and reliability of a roadbed soil slope. Background technique [0002] As one of the three basic structures of line engineering, subgrade occupies a relatively high proportion in railway and highway engineering. Among them, the instability and damage of subgrade slope is one of the main risk sources affecting the safety of line engineering operation. Based on this, it is of great engineering value and practical significance to carry out the research on rapid assessment of stability and reliability of roadbed slopes for the improvement of driving safety. In engineering, the deterministic analysis method is often used for evaluation. This method is based on the overall limit equilibrium. If the object is a general soil sliding wedge, the sliding surface is set as an arc surface, and the wedge...

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Problems solved by technology

The existing probabilistic analysis methods mainly use the first-order second-order moment method, the first-order reliability method, and the stochastic finite element method based on Monte Carlo simulation to calculate the reliability index β of the slope. practical application

[0003] Since the stability and reliability index β can take into account the uncertainty of slope soil strength parameters, compared with the stability and safety factor F s It is more comprehensive, but it has the defects of complicated calculation process and huge amount of data, especially for the small probability event of engineering failure, even the Monte Carlo method with simple concept and strong applicability needs to calculate a large number of random samples to obtain a small deviation. β(P f )

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