基于数值模拟方法对强动压下巷道变形分析

Analysis of roadway deformation under dynamic pressure reduction based on numerical simulation

针对5111巷在强动压下出现大变形问题,应用位移反演法获取岩体力学参数,采用莫尔-库伦屈服准则,根据数值模拟方法对巷道进行原支护、补强支护以及不同间距下补强支护,得出不同方式下的位移曲线,依据模拟数据得知补强支护能够满足巷道掘进和动压下的强度要求。5111巷在受采动影响下出现大变形的主要原因:一是,前期设计缺乏理论依据导致前期支护不足;二是,当巷道出现大变形时未及时对支护进行调整,引起后期补强支护不及时。

In view of the large deformation problem of 5111 lane under dynamic pressure,this paper obtains the kinematic parameters of rock mass by displacement inversion method,adopts Mohr-Coulomb yield criterion and uses the numerical simulation method to simulate the original support,reinforcement support and reinforcement support under different spacing.The displacement curves under different modes are obtained,and the reinforcement support can satisfy roadway excavation and dynamic pressure under the strength requirements.The main reason for large deformation in 5111 lane under the influence of mining are listed as followed.First,lack of theoretical basis for the preliminary design leads to insufficient early support.Second,when large deformation occurs,the supporting roadway is not timely adjusted,causing late reinforcement is untimely.