Settlement-limited stoping method for false mined-out layer support formed in combination with rock gangue

Abstract

The invention discloses a settlement-limited stoping method for a false mined-out layer support formed in combination with a rock gangue, and relates to the technical field for prevention and controlof mining engineering stoping and surface subsidence. The method comprises the following steps of: matching a rock stratum with a gangue by reinforcing a grout, providing an output pipe on a partitionin a ganguelayer through using stopping, footage and caving time difference, the gravity downflow of the grout and spatial crack rules of the gangue, injecting the grout in a collapsed roof rock layer to form a stable support false layer arranged in sections, and matching with an erected dense and thin wall for ventilation, wherein a first working face adopts b-shaped mining, and the subsequent working faces adopt p-shaped mining; and after a reserved phased roadway is initially collapsed, a reserved liquid supply pipe is used to pour the suspended space of the roadway to form a complete false mined-out layer, and the stratum subsidence and stope water accumulation can be controlled. The stopping method reduces the tunnelling workload of the working face, and can control the surface settlement effectively, and the mining of mineral resources can be completed under the conditions of low cost, high recovery rate and environmental protection.

Description

technical field [0001] The invention relates to the technical field of mining engineering mining and surface subsidence prevention, in particular to a subsidence-avoiding mining method for pseudo-mined-out layer support formed by coordinating rock and gangue. Background technique [0002] With the rapid development of the economy, the demand for mineral resources is increasing day by day, especially the utilization of coal resources. However, the exploitation of underground resources has brought many serious problems, such as the destruction of the surface, serious threats to water resources, vegetation, buildings, etc., and the reduction of arable land, which seriously undermines the harmonious development of nature and human beings. In addition, due to the gradually increasing ground stress during resource mining, the original mining method has caused more safety accidents, such as rock bursts, water inrush in old empty areas, etc., resulting in casualties. The low recove...

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Problems solved by technology

[0004] Most of the existing mining methods leave coal pillars to reduce the recovery utilization rate of resources. Due to the high cost of the filling method, the goaf is usually treated with the full caving method, and the caving of the goaf will cause surface subsidence, etc. question

The method of leaving coal pillars to support the goaf will cause a waste of coal resources, and it is accompanied by the risk of rock burst, the support effect of the coal pillars on the goaf is limited, and there are still problems such as water accumulation in the old goaf

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