论文部分内容阅读
回采底鼓是煤矿巷道中经常发生的矿山压力现象,底鼓严重时会导致巷道断面缩小,阻碍运输、通风和人员行走,严重影响生产和威胁安全。因此,对回采巷道底鼓进行预测是具有必要性的。本文依据层状岩体破坏原理并结合破坏岩体的碎胀性原理,提出了应用有限元的方法对回采巷道底鼓倾向进行预测,以便对可能出现严重底鼓的巷道提早做出防治措施。文中根据阳煤集团二矿提供的具体地质力学资料共建立五个有限元模型进行了数值计算,结果表明:工作面回采之前,该煤矿15#煤层首采盘区顺槽底板无明显底鼓变形倾向,大多数区域所可能产生的底鼓变形量不大,不会对正常生产造成大的影响;工作面回采时,底鼓变形量有所增加。底板拉应力区从小到大依次是:单侧回采时的实体煤侧巷道、单侧回采时的中部巷道、双侧回采时的中部巷道、单侧回采时的采空区侧巷道、双侧回采时的采空区侧巷道。
The bottom drum is the mine pressure phenomenon often occurring in the coal mine roadway. When the bottom drum is serious, the cross section of the roadway will be narrowed, hindering the transportation, ventilation and personnel walking, seriously affecting the production and threatening the safety. Therefore, it is necessary to predict the bottom drum of mining roadway. Based on the principle of bedrock failure and combined with the principle of bedrock disintegration, this paper proposes a finite element method to predict the tendency of bottom drum of the roadway in order to make early prevention and control measures for roadway that may have serious bottom drum. Five finite element models were established based on the specific geomechanical data provided by the No.2 coal mine of Yangquan Coal Mine. The results show that there is no obvious bottom drum deformation before the mining face of No. 15 coal seam In most areas, the deformation of the bottom drum may not be large and the normal production will not be greatly affected. When the working face is demolished, the deformation of the bottom drum increases. From bottom to top, the tensile stress zones are as follows: solid coal side roadway during single-side recovery, middle laneway during single-side recovery, middle laneway during double-side recovery, gob-side laneway during single-side recovery, double-side recovery When the gob side of the roadway.