隧道及地下工程围岩稳定性及可靠性分析的极限位移判别

Ultimate displacement discrimination of stability and reliability analysis of surrounding rocks of tunnel and underground engineering

隧道和地下空间工程的稳定性和可靠性评价的问题一直是岩土工程界关注的难点问题。针对隧道围岩-支护系统的稳定性、可靠性、安全性的问题,采用以隧道及地下工程围岩变形位移为判据的隧道及地下工程围岩稳定性分析方法,分析了隧道及地下工程围岩位移的极限状态,提出了隧道及地下工程围岩极限位移的确定方法和大变形隧道及地下工程围岩极限位移的分析方法。结合工程实例,建立了以DGM(2,1)模型和Verhulst模型为理论的隧道及地下工程围岩稳定性分析的位移预测预报方法;在此基础上,提出了隧道及地下工程围岩稳定性及可靠性位移判别准则。其研究和分析结果将有助于构建隧道及地下工程围岩稳定性分析的位移预测预报系统。

Stability and reliability evaluation of tunnel and underground engineering is a very difficult problem in rock and soil engineering. Aiming at the problem of stability, reliability and safety of tunnel surrounding rocks and supporting system, the ultimate displacement situation of tunnel and underground engineering surrounding rocks is analyzed by stability analysis method of surrounding rock displacement discrimination; and a method of determining the ultimate displacement of tunnel and underground engineering surrounding rocks and an ultimate displacement analysis method of large strain of tunnel and underground engineering surrounding rock are put forward. Combining with an engineering example and in accordance with DGM (2,1) and Verhulst models, a displacement forecasting method of stability analysis of tunnel and underground engineering surrounding rocks is proposed. At same time, a displacement criterion of surrounding rock stability and reliability is established. The study can help to build the displacement forecast system to analyze the stability and reliability of tunnel and underground engineering surrounding rocks.