Shape optimization method for steep slope of an end wall of an open-pit coal mine

Abstract

The utility model relates to a shape optimization method for steep slope of an end wall of an open-pit coal mine, belonging to the field of open-pit mining. This method qualitatively analyzes the influencing factors of the slope stability and the potential landslide model of the open-pit coal mine. The importance, service time and physical and mechanical indexes of slope are analyzed, and the safety reserve coefficient of steep slope before and after pressure slope is determined. Selecting typical engineering geological section, steepening is carried out on the basis of the current situation of end-slope angle, and the quantitative relationship between slope stability and slope angle is analyzed to determine the best mining angle of steep slope. According to the definite angle, the different mining patterns of steep slope are put forward by adjusting the width of the conveyance flat plate in the lower part of the slope, and the optimum mining pattern of steep slope is obtained by giving consideration to economy and safety. Calculate the stability of steep slope under different pressure height, get the quantitative relationship between slope stability and pressure height, and then determine the pressure height. By using this method, the coal resources can be fully recovered, the stripping ratio can be reduced, and the economic benefit can be improved.

Description

technical field [0001] The invention belongs to the field of open-pit mining, and in particular relates to a form optimization method for side slopes of open-pit coal mines. Background technique [0002] Most of the existing open-pit coal mines in my country have coal seam occurrence conditions that are near-horizontal, subdivided mining, and fast advancement of stope working gangs, which can realize the inner row of gangs earlier. In order to excavate the coal in the earth's crust during the mining process of open-pit coal mines, it is necessary to strip off the rocks covered above the coal in advance, and then transport the waste materials to the outer dump or directly discharge a land dynamic in the inner dump evolutionary process. The stopes and dumps of open-pit coal mines form high and steep slopes during the dynamic evolution of the land. Due to the high and steep end walls of large-scale near-horizontal open-pit coal mines, when the slope angle is small, a large amo...

AI Technical Summary

Problems solved by technology

The design of slope form in open-pit coal mines usually uses 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

In addition, when designing the slope angle, most of them do not consider the time effect of the periodic formation and disappearance of the side slope in the mining area during the excavation and internal drainage process, and regard the time-sensitive slope as a permanent service It will also cause the overall slope angle of the design to be 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 small slope angle and cause a lot of waste of coal resources

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