Method for calculating optimal excavation slope ratio of mine slope

Abstract

The invention discloses a method for calculating the optimal excavation slope ratio of a mine slope. The method comprises the steps: taking a mine slope as a research object, and establishing a multi-objective optimization nonlinear mathematical programming model of mine slope stability safety and excavation economy, wherein the model takes the maximum value of the safety coefficient and the maximum value of the excavation benefit as objective functions at the same time; taking the excavation slope ratio and the shearing force and the normal force of the structural surface as decision variables, and taking the balance equation constraint condition of the slope slip mass and the yield condition of the structural surface as constraint conditions, wherein a gravity function constructed in the constraint conditions can change along with the change of the excavation slope ratio; therefore, the constraint condition of the limit balance of the slope slip mass can be well related to the safety and the economy of the mine slope, and the actual mine slope excavation requirement is better met; by means of the method, the optimal excavation slope rate of the mine slope can be directly obtained, and the excavation benefit is the highest; meanwhile, the stability safety coefficient is the maximum, and then the unification of excavation economy and stability safety is achieved.

Description

technical field [0001] The invention relates to a method for calculating the optimal excavation slope ratio of a mine slope, belonging to the technical field of mine slope stability analysis. Background technique [0002] In recent years, the slope stability problems caused by the excavation of mine slopes have been widely concerned by geotechnical engineers. There are usually two issues involved in the excavation of mine slopes: one is the stability and safety of the mine slope after excavation, and the other is the excavation economy produced by the excavation volume. Among them, the stability and safety of the mine slope after excavation mainly depends on the nature of the structural surface and its spatial combination. The layers, weak interlayers, faults, and joint surfaces in the mine slope are all factors that lead to slope instability and damage during the excavation process. The main reason is that the larger the excavation volume, the higher the economic benefits ...

AI Technical Summary

Problems solved by technology

There are usually two issues involved in the excavation of mine slopes: one is the stability and safety of the mine slope after excavation, and the other is the excavation economy generated by the excavation volume.

[0004] (1) In actual engineering, the excavation slope ratio of the slope is usually determined according to the geological professional suggestions and similar engineering experience, and the relevant principles and theories are still to be studied;

[0005] (2) Using the recommended excavation slope ratio given by the code, the stability, safety and excavation economy cannot be guaranteed to be optimal;

[0006] (3) The design of mine slope excavation is essentially a multi-objective problem that simultaneously seeks to maximize the benefits of mine slope excavation and to seek as high as possible the safety factor of mine slopes. At present, there is no good method to comprehensively consider;

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