【摘要】 本文对剪切破坏模式下的隧道掌子面防岩溶突水安全厚度进行了研究。首先对不同初始地应力场类别下的地应力特征进行分析,从而为隧道掌子面岩墙抗剪切破坏时剪切面上法向应力的确定方法提供客观合理的依据。隧道开挖会造成围岩应力的重分布,隧道开挖前后的围岩应力状态存在明显不同,本文基于这一特征建立了掌子面岩溶突水剪切破坏模式下的剪切面法向应力计算方法。然后针对工程中相关参数具有的区间不确定性特征,引入区间非概率可靠性分析方法,从而最终建立隧道掌子面岩墙防岩溶突水的安全厚度区间非概率计算方法。最后,通过本文方法计算结果与实际工程结果的对比分析表明了本文方法的适用性和合理性。更多还原

【Abstract】 The safety thickness of tunnel face’s dike for preventing water irruption is examined with the shear failure model. The characteristics of ground stress in different categories of initial stress field are analyzed to provide a reasonable basis for the determination method of the normal stress on shear surface when the tunnel face’s dike was suffering shear failure. The tunnel excavation will cause stress redistribution,and the rock mass stress states before and after the tunnel excavation are significantly different. Based on this feature the calculation method of the normal stress on shear surface is set up when the tunnel face’s dike is suffering shear failure. According to the interval characteristics of parameters,the interval non-probabilistic reliability analysis method is introduced to establish the calculation method of the safety thickness of the tunnel face’s dike for preventing water bursting. The rationality and feasibility of the proposed method is verified by analyses of practical engineering examples.更多还原