不衬砌水工隧洞围岩稳定性数值模拟分析

针对高渗压作用不仅会改变岩土体的应力状态,同时可能会使岩体劈裂、破坏岩体的原有结构的现象,基于流固耦合分析理论,利用快速拉格朗日有限差分法对隧洞围岩稳定性进行分析。从考虑渗流效应时围岩开挖稳定性、内水作用下围岩力学特性方面开展研究,得到围岩开挖后应力场、位移场分布特征,开挖卸载对渗流场的反馈,内水作用下隧洞的破坏特征和水力特性演变趋势。研究结果表明:对隧洞施工过程中采取安全措施,富水条件下的隧洞工程防排水提供一定的理论参考。

Numerical simulation analysis for surrounding rock stability of unlined high pressure hydraulic tunnels

Aiming at the phenomena that hyperosmolar role will not only change the stress state of rock and soil,but also cause the rock splitting,destroy the original structure of the rock.Based on the coupled fluid-solid theorem,numerical analysis for the stability of tunnel surrounding rock was done with fast Lagrangian analysis of continua in three-dimension(FLAC3D).Based on the surrounding rock stability considering percolation and the surrounding rock characteristics with the internal water fluid as main research aspects,the stress field and displacement field feature after rock excavation,feedback of excavation on seepage field,evolution trend of failure characteristics and hydraulic characteristics of the tunnel under the role of internal water was achieved.The research results can provide a theoretical basis for corresponding safety measurement in construction process and waterproofing of tunnel in aquifer condition.