切顶卸压沿空留巷无煤柱开采技术实践OA

In order to alleviate the tension of mining and replacement in Jinbangde Mine,eliminate the stress concentration of coal pillars in the section,improve coal extraction rate,and maintain the stability of the roadway,this article takes 10404 return air roadway as the experimental object.Through theoretical analysis,numerical simulation,on-site testing,and other methods,the roof structural characteristics,roof cutting parameters,surrounding rock control technology and supporting e-quipment of the goaf roadway in the fully mechanized caving working face are studied,and the behavior law of mine pressure in the retained entry along the goaf is probed,forming a set of roof cutting and retaining roadway technology suitable for the fully mechanized top coal caving working face.Through on-site testing,when the distance behind the working face is 80 m,due to the gradual cutting,filling,and compression of the roof on one side of the goaf with the progress of mining,the de-formation of the surrounding rock of the roadway gradually becomes stable,thus achieving good retaining roadway effect and ensuring the smooth development of the next fully mechanized top coal caving mining face.