弱胶结地层巷道地应力数值反演

Ground Stress Numerical Inversion of Roadways with Weakly Cemented Strata

在鲁新煤矿巷道断面实测相对收敛位移的基础上,采用弹性位移反分析方法对该巷道围岩的初始应力和围岩参数进行数值反演。利用反演结果进行数值模拟计算,并将所得测点间的相对位移和实测结果进行对比,两者之间吻合较好,说明采用位移反演法进行地应力还原是可行的。根据数值模拟结果和实地现场观测对该矿区在软岩巷道开挖后出现巷道围岩收敛位移大、底鼓、衬砌开裂和锚杆受力效果不好等现象的原因进行分析,并对巷道的支护设计和施工给出建议。

This paper, based on the relatively measured convergence displacement of roadway sections at Luxin eoalmine,used the elastic displacement backward analysis method to make a numerical inversion of initial stress and parameters of surrounding rock of the roadway. The numerical simulation was performed in accordance with the above backward analysis data. The comparison between the relative displacement of monitoring points and the simu- lated data was made, revealing the good agreement between them. The result shows that the displacement inversion method used for the ground stress redu^tt6n is feasible. Finally,according to the results of numerical simulation and in situ observations, the reasons Why these phenomena, such as the big surrounding rock convergence displacement, the floor heaving, lining cracking and bad effect of the bolt force occurred were analyzed, and providing the proposals for the design and construction of roadway supports.