Design and evaluation method of self-forming roadway mining without coal pillars by roof cutting and pressure relief

Abstract

The invention discloses a mining design and evaluation method for roof-cutting, pressure-relief, and coal-pillar-free self-formed roadway, which includes: simultaneously digging out the roadway space during the coal mining operation; dividing the surrounding rock of the excavated roadway; determining the prestress of each surrounding rock area Support parameters and roof cutting parameters; high prestressed energy-absorbing support for the roof, and directional roof cutting for the goaf side of the roof at the same time; gangue-blocking support for the roadway; gangue-blocking side of the roadway is closed to form a reserved roadway; Carry out real-time monitoring of roadway stability evaluation indicators for the reserved roadway, and conduct real-time evaluation of the stability of the reserved roadway based on the self-contained roadway stability evaluation system; optimize the reserved roadway according to the stability evaluation results. The invention realizes synchronous formation of roadway in the process of coal recovery and mining at the working face, ensures the stability of the roadway, does not leave coal pillars, has low cost, high working efficiency, safety and reliability, and is suitable for popularization.

Description

technical field [0001] The invention relates to a mining design and evaluation method for roof-cutting, pressure-relief and coal-pillar-free self-forming roadway, and belongs to the technical field of coal mining. Background technique [0002] As we all know, coal accounts for more than 50% of the primary energy produced and consumed in my country for a long time, and is the main energy source in my country. Coal is generally formed underground. At present, the traditional underground coal mining methods mainly include short-wall and long-wall mining methods. Among them, the long-wall mining method has been widely used at home and abroad because of its high productivity and good ventilation performance. The 121 construction method in the longwall mining method (that is, mining one working face, digging two roadways, leaving one coal pillar) is widely used in coal mining, but it can be found from actual implementation that it still has the following shortcomings: 1) The larg...

AI Technical Summary

Problems solved by technology

Coal is generally formed underground. At present, the traditional underground coal mining methods mainly include short-wall and long-wall mining methods. Among them, the long-wall mining method has been widely used at home and abroad because of its high productivity and good ventilation performance. The 121 construction method in the longwall mining method (that is, mining one working face, digging two roadways, leaving one coal pillar) is widely used in coal mining, but it can be found from actual implementation that it still has the following shortcomings: 1) The amount of roadway excavation is large, which invisibly leads to high production costs: it is often necessary to carry out a large number of roadway excavation projects during mining, and the excavation cost is high. At the same time, the roadway excavation process is mostly manual construction, which is time-consuming and labor-intensive

2) Serious waste of resources and frequent safety accidents: the left coal pillars cannot be recovered, and the waste of coal resources is serious. At the same time, it leads to the concentration of surrounding rock stress and frequent safety accidents

3) Irreversible damage to land resources: due to the support of the coal pillar, the fracture and collapse of the overlying strata above the goaf and the coal pillar are inconsistent, and the cracks will continue to expand to the surface, so uneven surface settlement is likely to occur problems such as damaging the environment, causing damage to a large amount of land resources

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