Shape design method of dip bedded slope of open-pit mine in composite coal seam

Abstract

The invention belongs to the field of open-pit mining and relates to a shape design method of a dip bedded slope of an open-pit mine in a composite coal seam. The method includes: first, acquiring step height and face angle of the dip bedded slope of the open-pit mine in the composite coal seam; second, numbering from top to bottom a plurality of weak beds in the dip bedded slope of the open-pit mine in the composite coal seam, and dividing the slope into a plurality of segments from top to bottom by using the weak beds as boundaries; third, determining a safety reserve coefficient K of the slope; fourth, determining flat plate width of the slope segment by segment from top to bottom, thereby allowing an absolute value of a difference between a slope stability coefficient of each segment and the safety reserve coefficient to be not greater than 0.01 and be satisfactory to checking calculation conditions, and meanwhile using flat plate widths of the corresponding segments as slope shape design results. The slope shape designed by the method is capable of effectively preventing landslide, ensuring maximum recycling of resources and maximizing economic benefit.

Description

technical field [0001] The invention belongs to the field of open-pit mining, and in particular relates to a method for designing the shape of a down-dipping layered side slope in a composite coal seam open-pit mine. Background technique [0002] For open-pit mines with high and large stopes, designing a reasonable slope shape is one of the important factors related to the safe production and economic benefits of open-pit mines. In the previous engineering practice, the two-dimensional limit equilibrium method was widely used to design the slope shape of the open-pit stope. This method usually only considers the stability of the overall slope so that it meets a certain safety reserve factor. [0003] The down-dipping layered slope refers to the layered structure slope on the inclined slope surface of the stratum, and landslides are easy to occur along the down-dipping layer, which is one of the important types in the field of slope engineering research. For a composite coa...

AI Technical Summary

Problems solved by technology

The previous slope engineering design methods did not consider the lithological conditions of strata with different buried depths and the differences in the development form of each weak layer, and could not realize the optimal design of slope slopes with slopes in complex coal seam open-pit mines. Landslides occur along the shallow weak layer when it reaches the bottom of the pit, which poses a great threat to the safe production of open-pit mines, and sometimes causes partial slope design to be conservative, affecting the economic benefits of open-pit mines

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