Rock mass critical sliding surface limit analysis method

Abstract

The invention discloses a rock mass critical sliding surface limit analysis method which comprises the following steps: collecting distribution ranges of rock masses with different properties, structural surfaces and soft layers in a target area through geological investigation; measuring physical and mechanical parameters of rock masses, structural surfaces and soft layers with different properties; dividing units; by taking the stress components of all nodes as independent variables, constructing a unit static balance constraint equation, a node stress known boundary condition constraint equation, a node stress yield criterion constraint equation and a target function, and forming a mathematical model for rock mass critical sliding surface limit analysis; and solving the optimal solution of the mathematical model and the node where the tight constraint of the mathematical model is located through a computer program, and determining the critical sliding surface of the rock mass. The method has the advantages that the method for quantitatively determining the critical sliding surface of the rock mass is provided, the defect that whether the rock mass is stable or not can only be qualitatively judged in the prior art is overcome, the theoretical basis is strict, the applicability is high, the calculation conclusion better conforms to engineering practice, and the method has good engineering practical value.

Description

technical field [0001] The invention relates to the field of stability analysis of geotechnical engineering, in particular to a limit analysis method of critical sliding surface of rock mass. Background technique [0002] Rock mass engineering stability analysis is widely used in projects such as water conservancy and hydropower, highway and rail transit, industrial and civil construction, geological and mineral development, and ecological environment management. Rock mass stability analysis mainly includes three types of problems: rock slope stability analysis, underground cavern surrounding rock stability analysis and rock foundation bearing capacity analysis; it mainly involves two aspects: the identification of rock mass stability and the analysis of rock mass stability. Calculation of critical slip surfaces. Among them, the determination of rock mass stability mainly solves the problem of whether rock slopes, underground caverns and rock foundations can remain stable u...

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Problems solved by technology

[0003] At present, in rock mass stability analysis, the commonly used limit equilibrium method can only analyze rock mass stability, and it is necessary to assume that the critical sliding surface is known when determining stability, and cannot calculate the critical sliding surface of rock mass

Other rock mass stability analysis methods, such as slip line method, finite element method and limit analysis method, can calculate the critical sliding surface of rock mass, but the slip line method has poor applicability and is not suitable for actual engineering calculations; finite element method requires When using the most difficult constitutive relationship in rock mass, the limit analysis method needs to introduce the assumption of stress discontinuity or velocity discontinuity, which leads to insufficient theoretical rigor

[0004] The patent of "Limit Analysis Method of Rock Mass Stability" filed by the inventor of this application on December 29, 2021, the application number is: 202111610587.4, does not need to introduce the most difficult constitutive relationship in the rock mass, nor does it need to introduce stress The assumption of discontinuity or velocity discontinuity has strong applicability, but it can only judge whether the rock mass is stable, but cannot give the critical sliding surface of the rock mass

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