Method for determining parallel development step pitch of inner and outer dumping sites of soft rock opencast coal mine

Abstract

The invention discloses a method for determining a parallel development step pitch of inner and outer dumping sites of soft rock opencast coal mine, and belongs to the technical field of open pit mining, and the method comprises the steps: firstly, determining the safety reserve coefficient of a tall and large composite slope formed by an outer dumping site, a stope and an inner dumping site independently or by combining two or three of the outer dumping site, the stope and the inner dumping site according to the service life of the slope; according to the shape of the side slope, adopting a bishop method and a residual thrust method to calculate and obtain the stability coefficient of the side slope independently, or the stability coefficient of the side slope combining the two or the three of the outer dumping site, the stope and the inner dumping site, comparing the error between the stability coefficient and the safety reserve coefficient, and adjusting the flat plate width of the outer refuse dump, the distance between the top of the stope and the bottom of the outer dumping site and the flat plate width of the innerdumping site; and based on the optimal value of the values, adjusting the forward development step pitch of the outer dumping site. According to the method, the space of the inner and outer dumping sites is quickly and fully occupied, the stripping distance can be shortened, the mining cost of the open pit coal mine is reduced, and the defects of lagging development and large distance of the traditional design outer dumping site are overcome.

Description

technical field [0001] The invention relates to the technical field of open-pit mining, in particular to a method for determining the parallel development step distance of internal and external dumps of soft rock open-pit coal mines. Background technique [0002] Quickly occupying the inner and outer dumps is an important way to achieve safe, efficient and green mining in open-pit coal mines. However, the stability of the tall composite slope composed of inner dumps, stopes, and outer dumps directly threatens the stability of open-pit coal mine workers and employees. Equipment Security. In the previous slope shape design process, after the stope reached the boundary, a fixed distance was maintained between the outer dump and the stope. When the inner dump developed far or reached the surface, the outer dump It was only followed up, which led to the lag in the development of the outer dump site, the increase in transportation distance, and a serious increase in the cost of o...

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Problems solved by technology

In the previous slope shape design process, after the stope reached the boundary, a fixed distance was maintained between the outer dump and the stope. When the inner dump developed far or reached the surfac

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