近距离煤层采空区下工作面矿压显现规律研究

Strata behavior below the gobs of close upper seams

针对近距离煤层采空区下开采采场矿压控制问题,根据某煤矿地质条件及工作面布置方式,采用物理相似模拟与现场实测相结合的研究方法,总结了近距离煤层上煤层开采完毕后,采空区下工作面回采过程中矿压显现规律,进一步分析了采空区下采场覆岩运动规律;由于上煤层开采造成上覆岩层垮落,老顶岩层完整性受到破坏,采空区下煤层开采时,工作面采场覆岩构成"块体-散体-块体"的复合老顶结构,从而使工作面开采过程中形成"小-大初次来压及周期来压"的矿压显现规律。

Aiming at underground pressure control under goaf of close multi-seams,according to geological conditions and layout of working face,by means of physical simulation and field measurement methods,we summed up the pressure behavior law and further analyzed overlying strata movement under the gob after close multi-seam being mined out.Due to the up coal seam being mined out,the overlying strata collapsed,leading to the destruction of the integrity of roof;and with the coal seam under the goaf being mined out,the overlying strata constituted a ＂block-discrete-block＂ of the complex main roof structure,which formed ＂small-large first weighting and periodic weighting＂ behavior law as the working face advanced.