大断面小净距隧道水力耦合围岩稳定性数值模拟

Numerical Analysis of Stability of Surrounding Rock for Large-Section Tunnels with Small Spacing Under Hydro-Mechanical Coupling Action

以在建富水区大断面小净距公路隧道为工程依托,通过自主开发的弹塑性应力-渗流-损伤耦合有限元计算模型对水力耦合作用下大断面小净距隧道围岩稳定性进行计算。采用差异进化算法进行损伤参数反演,在所得反演参数的基础上,对不同净距下,所选开挖断面处围岩的塑性区分布、损伤场演化规律和不同注浆圈参数对隧道周边损伤值及洞内涌水量的影响规律进行计算结果分析。

The FEM simulation model for elastoplastic-seepage-damage coupling is established depending on the large-section tunnels with small spacing under construction.The inversion analysis based on differential evolution method is carried out to determine the damage parameters in coupling model.According to the parameters which is get from inversion analysis,the plastic zone distribution in surrounding rock,the evolution law of damage fields and how grouting circle parameters affect the damage values on tunnel edge is calculated in this paper.