某矿山巷道围岩的三维非线性稳定分析

Three-Dimension Nonlinear Stability Analysis of the Mine Surrounding Rockmass

通过有限元计算,对矿山巷道的主巷道和穿脉巷道进行了三维非线性稳定分析。从总体上来看,巷道周围的位移和应力都是随着巷道埋深的增加而增加的:主巷道和矿岩中的穿脉巷道都出现了不同程度的塑性区,其塑性区的范围也随着巷道埋深的增加而不断加大;巷道周围的主要各点处都出现了不同程度的应力集中现象,其应力集中的程度也越趋严重;应力的分布出现了分层过渡现象,其应力值也逐渐变大,巷道之间的相互影响十分明显。对砂岩的穿脉巷道进行稳定性分析时发现由于其岩石性能本身较差,巷道的围岩稳定性较差,需要在支护设计中重点考虑。

The 3 - D model of the mine surrounding rockmass is established and analyzed by using nonlinear fi- trite element method （FEM）. The stabihty of the main roadway and the branch roadway is studied. It is shown that the displacement and the stress of the surrounding rock increase with the increasing depth of the rockmass. The plastic zones in the main roadway and the branch roadway are found and the plastic area of the plastic zone increases. There are some Stress concentration areas, which are found around the tunnel, and the degree of the stress concentration becomes larger with the increasing depth of the rockmass. The transitional delaminating phenomenon of the stress appear and the value of the stress increases with the increasing depth of the tunnel. The stress interaction of the opening is evident. The capability of the sandstone is poor, so the stability of the surrounding rock mass in the branch roadway need to be considered seriously in support design.