A Design Method of Key Parameters for Controlled Filling of Room-and-Pillar Goaf

Abstract

The invention provides a key parameter design method for controlled filling of a room-and-pillar goaf. The method comprises the following steps: Step 1. Sampling the coal and rock mass left over in the room-and-pillar goaf, and testing to obtain the coal rock The physical and mechanical parameters of the body, the physical parameters include the disintegration coefficient of coal and the angle of repose of the accumulation body; step 2, determine the maximum stripping depth of the remaining coal pillar according to the physical and mechanical parameters of the measured coal rock mass; step 3, according to the remaining Determine the safety factor of the remaining coal pillar by the maximum stripping depth of the coal pillar; step 4, determine whether it is necessary to fill the room-and-pillar goaf according to the safety factor of the remaining coal pillar, and determine the filling treatment method and the key filling parameters for the control of filling treatment. The inventive method makes full use of the bearing capacity of the left coal pillar in the goaf, improves the filling effect of the room-and-pillar goaf, and reduces the filling cost of the room-and-pillar goaf.

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

Images