圆形隧道环向存在隐伏充填溶腔时防突岩墙的上限稳定性分析
发布时间：2018-11-19 18:42
【摘要】：岩溶隧道施工中遭遇高压充填溶腔时,若防突岩墙的稳定性不足易造成突水突泥等地质灾害.因此基于极限分析原理提出了一种分析防突岩墙稳定性的研究思路.针对隧道环向遭遇隐伏充填溶腔的工况,利用广义切线法获得Hoek-Brown非线性破坏准则的转化强度参数,构建了岩墙二维计算模型.并结合上限原理与强度折减技术,将安全系数引入能耗分析过程,达到了表征防突岩墙稳定性的目的.最后,通过优化分析,探讨了岩墙安全系数随各参数的响应情况.研究结果表明:除围岩重度参数外,岩墙厚度、溶腔充填物压力、隧道支护压力、圆形隧道断面直径、单轴抗压强度、Hoek-Brown常数等,都对岩墙安全系数的变化影响显著.此外,将方法应用至"宜万铁路"、"忠垫高速"和"恩来高速"的岩溶隧道中,良好的结果验证了方法的可行性.
[Abstract]:When the karst tunnel is filled with high pressure cavities, if the stability of the anti-outburst wall is insufficient, it will easily cause geological disasters such as water inrush and mud outburst. Therefore, based on the limit analysis principle, a research idea of analyzing the stability of anti-outburst rock wall is put forward. According to the condition of the tunnel encountering the concealed filling cavity in the circumferential direction, the transformation strength parameters of the Hoek-Brown nonlinear failure criterion are obtained by using the generalized tangent method, and the two-dimensional calculation model of the rock wall is constructed. Combined with the upper limit principle and the strength reduction technique, the safety factor is introduced into the energy consumption analysis process, and the purpose of characterizing the stability of the anti-outburst wall is achieved. Finally, through optimization analysis, the response of safety factor of rock wall with each parameter is discussed. The results show that the thickness of rock wall, the pressure of cavity filling, the pressure of tunnel support, the diameter of circular tunnel section, the uniaxial compressive strength and the Hoek-Brown constant all have significant effects on the safety factor of rock wall. In addition, the method has been applied to karst tunnels of "Yiwan Railway", "Zhongcushion High Speed" and "Enlai Expressway". The results show that the method is feasible.
【作者单位】： 中南大学土木工程学院;
【基金】：国家重点基础研究发展计划(973计划)项目(2013CB036004) 国家自然科学基金资助项目(51378510,51308072)~~
【分类号】：U451
本文编号：2343100
[Abstract]:When the karst tunnel is filled with high pressure cavities, if the stability of the anti-outburst wall is insufficient, it will easily cause geological disasters such as water inrush and mud outburst. Therefore, based on the limit analysis principle, a research idea of analyzing the stability of anti-outburst rock wall is put forward. According to the condition of the tunnel encountering the concealed filling cavity in the circumferential direction, the transformation strength parameters of the Hoek-Brown nonlinear failure criterion are obtained by using the generalized tangent method, and the two-dimensional calculation model of the rock wall is constructed. Combined with the upper limit principle and the strength reduction technique, the safety factor is introduced into the energy consumption analysis process, and the purpose of characterizing the stability of the anti-outburst wall is achieved. Finally, through optimization analysis, the response of safety factor of rock wall with each parameter is discussed. The results show that the thickness of rock wall, the pressure of cavity filling, the pressure of tunnel support, the diameter of circular tunnel section, the uniaxial compressive strength and the Hoek-Brown constant all have significant effects on the safety factor of rock wall. In addition, the method has been applied to karst tunnels of "Yiwan Railway", "Zhongcushion High Speed" and "Enlai Expressway". The results show that the method is feasible.
【作者单位】： 中南大学土木工程学院;
【基金】：国家重点基础研究发展计划(973计划)项目(2013CB036004) 国家自然科学基金资助项目(51378510,51308072)~~
【分类号】：U451
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