A Settlement-Limited Recovery Method of Pseudo-mined-out Layer Support with Combined Rock and Gangue Forming

Abstract

The invention discloses a subsidence-limiting recovery method for pseudo goaf support formed by coordinating rock and gangue, and relates to the technical fields of mining engineering recovery and surface subsidence prevention and control. In this method, the grout is strengthened to make the rock strata and the gangue cooperate with each other, and the time difference of the mining advance and caving, the gravity of the grout and the space cracks of the gangue are used to configure the output pipe at the partition in the gangue layer, and the grout is injected into the collapsed roof rock layer to form components. A stable support pseudo-layer is arranged in sections, and the airtight thin wall is erected for ventilation; the first working face adopts b-shaped mining, and the subsequent working face adopts p-shaped mining; it is used after the initial collapse of the reserved staged roadway The reserved liquid supply pipe is poured into the suspended space of the roadway to form a complete pseudo goaf to control the subsidence of the ground and the accumulation of water in the stope. The mining method reduces the excavation workload of the working face, can effectively control the surface subsidence, and completes the mining of mineral resources 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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