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革镇堡隧道是辽宁省的重点建设工程,其中破碎段岩体地质条件复杂,传统方法不能很好地反映其力学行为。针对上述问题,在建立大规模的复杂地质结构的数值网格基础上,采用三维岩土工程软件FLAC3D,分别根据无支护、初次支护和二次支护3种情况,4 m一个步长,分为上下两台阶对该段隧道的分步动态施工过程进行了三维数值模拟。通过对位移场、应力场的演化情况和塑性区分布的模拟计算,分析了开挖支护动态过程的复杂力学行为。计算结果显示,位移与监测数据比较一致,现有的二次支护方案能够保证围岩的稳定性。数值模拟的结果对于该段隧道的施工具有指导意义。
Gezhenbao Tunnel is a key construction project in Liaoning Province. The geological conditions of the rock fragments in the fragmentation section are complex. The traditional methods can not reflect the mechanical behaviors well. In view of the above problems, based on the establishment of large-scale numerical grid with complex geological structure, three-dimensional geotechnical engineering software FLAC3D is used. According to the three cases of no support, primary support and secondary support, , Divided into two steps up and down the tunnel of the step-by-step dynamic construction of the three-dimensional numerical simulation. Through the calculation of the displacement field, the evolution of stress field and the distribution of plastic zone, the complicated mechanical behavior of the dynamic process of excavation and support is analyzed. The calculation results show that displacement and monitoring data are consistent, and the existing secondary support scheme can ensure the stability of surrounding rock. The numerical simulation results are instructive for the construction of this section of tunnel.