Roof-cutting pressure-relief coal-pillar-free self-roadway-forming mining design and evaluation method

Abstract

The invention discloses a roof-cutting pressure-relief coal-pillar-free self-roadway-forming mining design and evaluation method. The method comprises the following steps of: digging a roadway space in a coal mining operation process; performing surrounding rock partitioning on an excavated roadway; determining pre-stress support parameters and top cutting parameters of all the surrounding rock areas; performing high-prestress energy-absorbing support on a top plate, and performing directional roof cutting on the goaf side of the top plate; performing roadway side rock blocking supporting; closing the roadway gangue blocking side to form a reserved roadway; monitoring roadway stability evaluation indexes of the reserved roadway in real time, and evaluating the stability of the reserved roadway based on a self-formed roadway stability evaluation system in real time; and optimizing the reserved roadway according to a stability evaluation result. The roadway is synchronously formed in the working face stoping coal mining process, roadway stability is guaranteed, coal pillars are not reserved, the cost is low, the working efficiency is high, safety and reliability are achieved, and the method 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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