大同矿区双系煤层开采煤柱影响下的强矿压显现机理

针对大同矿区石炭系煤层8105工作面过上覆侏罗系煤层采空区留设煤柱时的强矿压显现特征，采用理论与现场实测分析相结合的方法，对侏罗系煤层采空区煤柱的应力影响规律与石炭系煤层顶板的垮裂带范围进行了分析，得到了双系煤层开采煤柱影响条件下工作面强矿压显现的“煤柱-覆岩运动”联合作用机理。研究表明：侏罗系煤层采空区留设煤柱的水平与垂直应力较高，达10.5～13.5 MPa，应力集中区深度为40～70 m，剪应力波及范围达180 m；8105工作面顶板的垮裂带高度为150～170 m；工作面过煤柱时的强矿压显现是由采空区煤柱与煤层顶板垮裂运动联合作用的结果。

Mechanism of strong pressure reveal under the influence of mining dual system of coal pillar in Datong mining area

In Datong mining area，carboniferous coal seam of 8105 working face under the Jurassic coal gob pillar leaving was characterized by strong pressure，with the theoretical analysis and field testing applied，the Jurassic coal mined-out area of coal pillar stress influence law and carboniferous coal seam roof collapse of crack zone was analyzed，and obtained a dual-line coal seam mining face under strong influence column of the strata “coal pillar-overburden movement” joint mechanism.It shows that the Jurassic coal gob pillar leaving in the horizontal and vertical stress is higher，up to 10.5-13.5 MPa，and stress concentration zone depth of 40-70 m，the shear stress spread range up 180 m；The roof of 8105 working face collapse crack zone height range is 150-170 m；face appeared a strong pressure of coal pillar is made up of the coal pillar and coal seam roof collapse result of combined effects of crack movement.