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为直观了解冻土帷幕在高水压下的力学特性,掌握隧道联接通道开挖过程中渗流与应力耦合作用对冻土帷幕稳定性的影响,保证开挖过程的安全,采用大型有限差分软件FLAC3D,对联接通道的开挖过程进行了数值模拟。从渗流应力耦合的数值分析角度,详细研究了冻土帷幕中位移场、应力场、渗流场的分布情况;得出了不同水位对冻土帷幕力学性能的影响;孔隙水压力使冻土帷幕的结构受力更加“均匀”;并指出了容易产生应力集中的位置为冻土帷幕的底部与中部,所以施工中应该值得注意。研究成果可为今后的联接通道数值模拟与人工冻结法施工提供参考。
In order to understand the mechanical properties of frozen soil curtain under high water pressure, to understand the influence of seepage and stress coupling effect on the stability of frozen soil curtain during excavation of tunnel connecting channel, and to ensure the safety of excavation process, a large finite difference software FLAC3D , The numerical simulation of the excavation process of the connecting channel was carried out. From the numerical analysis of seepage stress coupling, the distribution of displacement field, stress field and seepage field in frozen soil curtain are studied in detail. The influence of different water level on the mechanical properties of frozen soil curtain is obtained. The stress of the structure is more “uniform ”; and it is pointed out that the place prone to stress concentration is the bottom and the middle of the permafrost curtain, so the construction should be worth noting. The research results can provide reference for the future numerical simulation of joint channel and construction of artificial freezing method.