Mine pressure law of self-formed roadway without coal pillar in Huangling No.2 Coal Mine
In order to explore the roof deformation and stress evolution law of no-pillar self-formed roadway in the process of retaining roadway,taking the mechanical model of roadway surrounding rock and support system as the theoretical starting point,the deformation characteristics of roadway surrounding rock in different roof caving stages are analyzed.The mining pressure monitoring data of north second roadway no-pillar self-formed roadway in Huangling No.2 Coal Mine is taken as an example for engineering verification.The results show that the self-formed roadway without coal pillar is composed of sur-rounding rock,supporting structure and overlying strata.The roof fracture above the roadway goes through three evolution stages,including the initial stability stage,the intense deformation stage and the stable compaction stage.There are four fac-tors affecting the subsidence of roadway roof.When the thickness of coal seam is low,the height of roof collapse is high,the coefficient of rock crushing expansion is high,and the length of key block is smaller,the subsidence of roof will decrease.
no pillar self-formed roadwaymine pressureroadway deformationroof breakingmine pressure monitoring
万方数据
维普
