Room-pillar goaf control filling key parameter design method

Abstract

The invention provides a room-pillar goaf control filling key parameter design method. The method comprises the following steps of 1, carrying out coal and rock mass sampling on a left coal pillar in a room-pillar goaf, testing to obtain the physical and mechanical parameters of the coal and rock mass, wherein the physical and mechanical parameters comprise the breaking and expanding coefficient of coal and the angle of repose of an accumulation body; 2, determining the maximum stripping depth of the left coal pillar according to the measured physical and mechanical parameters of the coal-rock mass; 3, determining the safety coefficient of the left coal pillar according to the maximum stripping depth of the left coal pillar; 4, determining whether filling treatment needs to be conducted on the room-pillar type goaf or not according to the safety coefficient of the left coal pillar, and determining a filling treatment mode and the filling treatment control key parameters.According to the method, the bearing performance of the remaining coal pillars in the goaf is fully utilized, the filling effect of the room-pillar type goaf is improved, and the filling cost of the room-pillar type goaf is reduced.

Description

technical field [0001] The invention belongs to the field of coal mine subsidence prevention and control, and relates to goaf control filling parameters, in particular to a key parameter design method for room-and-pillar goaf control filling. Background technique [0002] Coal mine room-and-pillar goaf mainly refers to the goaf formed by mining methods such as room-and-pillar, room, and lane-and-pillar. After coal mining, the remaining coal pillars should be left to support the overlying rock, so as to control the movement of the overlying rock and the ground surface. However, under the action of factors such as overlying rock stress and weathering, the effective size and stability of the remaining coal pillars will continue to decrease, which will lead to the instability of the remaining coal pillars and the damage of ground structures, resulting in great damage. Security risks. With the construction of the national economy and the continuous development of mining cities,...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a design method for key parameters of room-and-pillar goaf control filling, which solves the problem of not considering the bearing capacity of the remaining coal pillars in the room-and-pillar goaf filling in the prior art. , The technical problem of excessive filling and grouting

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