主井箕斗装载硐室数值模拟及现场监测分析

Numerical Simulation and Field Monitor Analysis of Main Shaft Skip Loading Chamber

为了保证主井箕斗装载硐室的安全与稳定,评价其支护结构设计与施工方法的合理性,采用FLAC3D软件数值模拟和现场监测的方法,研究了红庆河煤矿主井箕斗装载硐室围岩和砌碹支护结构的变形和受力规律。结果表明:箕斗装载硐室水平受力不均匀,两侧山墙受力要小于其余侧壁;砌碹支护结构数值模拟法向应力极值为4.13 MPa,切向应力极值为1.77 MPa;现场监测靠近下部硐室迎面弧墙内排钢筋应力最大,数值为72.0 MPa,远小于钢筋设计强度值;监测期内该箕斗装载硐室是安全稳定的,砌碹支护结构设计与施工方法是合理有效的。

In order to ensure the safety and stability of main shaft skip loading chamber and to evaluate its rational design and construction of supporting structure,we use FLAC3 Dnumerical simulation software and field monitor to study the deformation and force laws of surrounding rock and arching supporting structure of Hongqinghe Mine main shaft skip loading chamber. The result showed that the horizontal pressure distribution was uneven; the pressure of both sides gable of skip loading chamber was less than the rest. The numerical simulation shows that normal stress extreme value reaches to 4. 13 MPa,though tangential stress extreme value reaches to 1. 77 MPa. The field monitor shows that the largest rebar stress value amount is 72. 0 MPa,which is far less than the steel design intensity value occurred in inner row rebar of head- arc wall near the lower part of chamber. The monitor data show that the skip loading chamber is safe and stable,and the design and construction of arching supporting structure is reasonable and effective.