End slope and side slope stability analysis method for open pit coal mine steep slope mining

Abstract

The invention discloses an end slope stability analysis method for open pit coal mine steep slope mining. The method comprises the steps of analyzing stability influence factors and a potential landslide mode of an end slope of an open pit coal mine; determining an end slope safety reserve coefficient; determining the final form of the steep slope mining end slope side slope; establishing a three-dimensional numerical model to analyze change characteristics of an end slope deformation failure rule and a slope stability coefficient under different tracking distances; and determining an inner row tracking distance, and implementing steep slope mining. According to the end slope stability analysis method for open pit coal mine steep slope mining, the slope where steep slope mining cannot be conducted is judged through a two-dimensional slope analysis method, new mining possibility is achieved, benefit maximization after the overall slope angle design is achieved, coal resources can be fully recycled, the production stripping ratio is reduced, and economic benefits are improved.

Description

technical field [0001] The invention belongs to the technical field of open-pit mining, and in particular relates to a side slope stability analysis method for steep-side mining in open-pit coal mines. Background technique [0002] Most of the open-pit mines in our country will be affected by the stripping ratio in the production process, resulting in the failure to maximize the annual output or economic benefits. When designing the slope angle in open-pit coal mines, most of them do not consider the time effect of the periodic formation and disappearance of side slopes in the mining area during the process of excavation and internal drainage, and regard time-sensitive slopes as permanent services. It will also lead to the overall slope angle of the design being too conservative. Furthermore, there are too many security flats and transportation flats arranged on side slopes, and the width of the flats usually exceeds the design requirements, which will directly lead to a sm...

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Problems solved by technology

[0003] The design of slope form in open-pit coal mines usually adopts the static limit equilibrium theory for stability calculation, and the complex three-dimensional slope that is double supported by the stope working side and the internal dump is simplified to a two-dimensional slope problem, which cannot be comprehensively solved. Accurately reflect the three-dimensional characteristics of the slope and the accurate stability state

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