改进CRD方案施工过程围岩安全稳定性分析

摘要

将有限元强度折减法应用于隧道工程围岩稳定性的分析，对改进的CRD法施工阶段围岩的安全、稳定性进行深入研究。结合哈大客运专线笔架山浅埋隧道改进CRD法施工方案，考虑围岩-结构的相互作用，应用有限元软件ANSYS动态分析施工过程中围岩的安全系数，通过等效塑性应变参数研究隧道的失稳形式。研究结果表明：有限元强度折减法可有效应用于隧道开挖阶段的安全定量评估。%In this thesis, the finite element strength reduction method was used for the stability analysis of surrounding rock in the process of tunneling, in order to closely study the safety and stability of surrounding rock in the process of tunneling by improved CRD construction method. Meanwhile, combining with the tunneling scheme under the improved CRD construction method for the Bijiashan shallowly-buried tunnel on Harbin-Dalian passenger-dedicated line, considering the interaction between the surrounding rock and the structure, using finite element software ANSYS, the thesis dynamically analyzed the safety factors of surrounding rock in the process of tunneling, and researched the instability features of the tunnel by means of equivalent plastic strain coefficient. The research result indicates that the finite element strength reduction method can effectually be used for the quantitative safety evaluation of the tunnel in the process of tunneling.