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用改进的非连续变形分析方法对某巷道进行了稳定性分析。采用考虑空间影响的等效初应力方法分析了巷道的开挖,并与忽略空间作用的方法进行了对比。结果表明,在工程中垂直于平面的应力或应变比较大时,空间作用不能忽略。然后将改进后的SSOR-PCG方法加入到非连续变形分析程序中,节省了方程的计算量,加快了计算效率。此外,采用改进后的程序分析了某工程六种不同断面形状的巷道的位移场和应力场,得到了巷道的最优断面为直墙半圆拱形断面。另外,通过对工程关键点位移的监测分析了预应力锚索对巷道围岩的加固效应,得到了锚索的长度为3 m,施加预紧力为150 MPa为巷道最优支护方式,可提高巷道围岩的稳定性。
Stability analysis of a roadway with improved discontinuous deformation analysis method. The excavation of the roadway is analyzed with the equivalent initial stress method considering the influence of space and compared with the method of ignoring the space effect. The results show that the space effect can not be neglected when the stress or strain perpendicular to the plane in the project is relatively large. Then, the improved SSOR-PCG method is added to the discontinuous deformation analysis program, which saves the calculation of the equation and accelerates the calculation efficiency. In addition, by using the improved program, the displacement field and stress field of six kinds of roadways with different cross-sections are analyzed. The optimal section of the roadway is the semi-circular arched section of straight wall. In addition, the reinforcement effect of prestressed cable on surrounding rock is analyzed by monitoring the displacement of key points of the project. The optimal length of the cable is 3 m and the pre-tightening force is 150 MPa, which is the optimal support for the roadway. Improve the stability of roadway surrounding rock.