王洼矿区软岩巷道围岩地质力学性能评价

Evaluation of geomechanical properties of surrounding rock of soft rock roadway in wangwa mining area

王洼矿区泥质软岩巷道围岩易水化膨胀、短期内碎胀扩容、蠕变变形持续时间长、全断面来压,巷道内架设普通的刚性支护后普遍出现破坏。因此,选取典型巷道开展该矿区软岩巷道围岩地质力学性能评价,全面掌握该矿区地应力大小和方向。结果表明:该地区属于中低应力地区;该矿地应力测点经统计最大水平应力、最小水平应力均小于最大垂直应力;地应力对该矿区开采活动的影响不大,巷道变形受地应力的影响也不大;下一步需重点考虑巷道围岩矿物成份及其膨胀特性,以及围岩松动破坏范围。

The surrounding rocks of the muddy soft rock roadway in Wangwa mining area are easy to be hydrated and expanded,broken and expanded in the short term,the creep deformation lasts for a long time,and the whole section is under pressure.Therefore,a typical roadway was selected to evaluate the geomechanical properties of surrounding rocks of the soft rock roadway in this mining area,so as to fully grasp the magnitude and direction of ground stress in this mining area.The results show that the area belongs to the area of medium and low stress.The maximum horizontal stress and minimum horizontal stress at the measuring point of ground stress in this mine are less than the maximum vertical stress.The ground stress has little influence on mining activities and roadway deformation has little influence on ground stress.In the next step,it is necessary to consider the mineral composition and expansion characteristics of roadway surrounding rock,as well as the scope of rock loose failure.