Research on Stress Appearance and Rock Movement Law of Surrounding Rock in Coal Seam Min-ing with Sudden Change in Thickness
In order to study the stress of mining surrounding rock and the law of strata movement un-der the condition of sudden change in thickness of coal seam,the FLAC3D numerical simulation software was used to establish a coal-rock mass model with sudden change of coal seam thickness and angle in the work-ing face of Pingmei Ten Mine No.15.16-24110.The displacement and stress of surrounding rock under the in-fluence of mining are simulated,and the causes and rules of roof and floor instability are analyzed.The re-sults show that,with the deepening of mining,the pressure relief area and stress concentration range be-come larger.At the position of sudden change coal seam,the influence range of the pressure relief area on the coal wall and surrounding rock of the coal seam working face suddenly expands,the roof pressure relief range becomes larger,forming a"double hump"shape,and the stress concentration coefficient of the coal wall increases significantly.The stress behavior and rock displacement of the overlying and underlying strata in the area of abrupt change in coal thickness are significantly higher than those in other areas,indicating that this area is prone to accumulate energy and becomes a frequent area of dynamic disasters and rock insta-bility.
surrounding rock instabilitysudden change in thicknessstress appearance
NETL
NSTL
万方数据
维普
