A Calculation Method for 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 invention takes the mine slope as the research object, and establishes a multi-objective optimization non-linear mathematical programming model for the stability, safety and excavation economy of the mine slope. The model takes the maximum value of the safety factor and the maximum value of the excavation benefit as the objective function; and takes the excavation slope rate, the shear force and the normal force of the structural surface as the decision variables, and the balance equation constraints of the slope sliding mass , The yield condition of the structural surface is a constraint condition, and the gravity function constructed in the constraint condition can change with the change of the excavation slope rate, so that the constraint condition of the limit equilibrium of the slope sliding mass can be well connected with the mine slope Safety and economy, thus more in line with the actual mine slope excavation requirements; through the method of the present invention can directly obtain the optimal excavation slope ratio of the mine slope, so that the excavation benefit is the highest while the stability and safety factor is the largest, thereby achieving Unification of excavation economy and stability and safety.

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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