摘要
以南屯煤矿9303工作面为工程背景,研究了孤岛"综放"工作面发生矿震的水平应力突变的力学机理。通过将上覆岩层中的各坚硬岩层简化成两对边简支、两对边固支的弹性矩形薄板力学模型,并对固支端施加由采动引起的水平应力,即以水平应力作用下的两对边简支、两对边固支弹性矩形薄板为力学模型,分析了9303工作面上覆坚硬岩层的应力分布,并研究了其极限垮落步距。以此为基础,预测了南屯9303工作面发生矿震并诱发冲击地压的步距,在此基础上对预测的危险区进行了卸压。在预计的位置发生2.6级矿震时,没有造成灾害,证明了厚硬顶板断裂引起的矿震是可以预测的。
Based on the engineering background of No.9303 stope in Nantun Coal mine,the mechanical mechanism of mine quake induced by the mutation of horizontal stress on the isolated island＇s fully mechanized caving face is studied.By simplifying hard rock in overlying strata into a mechanical model of elastic rectangular thin plates with simply supported and clamped beasms and by imposing horizontal stress caused by extraction to the clamped sides,namely the mechanical model with the elastic rectangular thin plates with simply supported and clamped beams under the action of horizontal stress,the distribution of stress and deflection of the overlying strata of hard rock is analyzed on the caving face of No.9303 stope,and the limitation of the caving step length of the roof of the overlying strata of hard rock is studied.Based on this,the drawing pace which causes coal outburst induced by mine quake is predicted.Then the pressure is released for the predicted dangerous areas.When 2.6-level mine quake happens in the predicted areas,there is no disaster,which proves that the mine quake caused by the crack of the roof of the thick layer may be predicted.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2011年第4期618-623,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(40674017,50774012)
国家“十一五”科技支撑计划项目(2007BAK24B04)
国家重点基础研究发展计划(973)项目(2010CB226803)
关键词
矿震
弹性薄板
水平应力
坚硬岩层
力学模型
mine quake
elastic thin plate
horizontal stress
hard overlying stratum
mechanical model
