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将浅埋隧道掌子面稳定性问题简化为二维平面问题,构造了更符合实际工况的隧道掌子面破坏模式。在此基础上,采用极限分析上限法得到浅埋隧道掌子面支护反力的目标函数,并建立了优化变量约束条件。利用Matlab编制计算程序进行优化求解,通过算例得到了不同边界条件下维持浅埋隧道掌子面稳定所需支护反力系数,解释了浅埋隧道掌子面失稳机理,并分析了影响掌子面失稳的主要因素。
The problem of the stability of shallow tunnel face is reduced to two-dimensional plane problem, and the tunnel face failure mode that is more in line with the actual working conditions is constructed. On this basis, using the upper bound method of limit analysis, the objective function of the reaction force of face support in shallow tunnel is obtained, and the constraints of optimization variables are established. The calculation program was optimized by Matlab, and the support reaction coefficient needed to maintain the stability of shallow tunnel surface under different boundary conditions was obtained. The instability mechanism of shallow tunnel surface was explained and the influence was analyzed The main factors of face instability.