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为了研究上覆溶洞与隧道间防突安全厚度,采用FLAC~(3D)建立了一系列上覆溶洞的隧道模型,模型中选择溶洞距离、溶洞大小、溶洞水压、隧道埋深、围岩级别作为工况因素。利用数值分析方法,揭示了不同工况下隧道开挖过程中上覆溶洞与隧道间单元塑性破坏直至贯通现象,并以塑形区贯通时溶洞与隧道间最短直线距离为防突安全厚度。基于不同工况下防突安全厚度数值计算结果,利用回归理论建立防突安全厚度预测模型,并形成一套基于VC++开发平台的防突安全厚度预测软件系统。该软件将理论和数据样本界面化,可实现对理论与繁琐计算的可视化操作。软件系统应用到翻坝高速鸡公岭隧道,结果表明,软件预测安全厚度与实际开挖有较好的吻合,以期为相似隧道工程提供一定的参考。
In order to study the safety of the overburden and the tunnel, a series of tunnel models of overlying karst cave were established by FLAC ~ (3D). In the model, the distance between karst cave, cave size, cave pressure, tunnel depth, As a condition factor. The numerical analysis method is used to reveal the plastic failure of overlying caverns and tunnels during tunnel excavation under different working conditions until the penetration is complete. The shortest straight line distance between the caverns and tunnels is the outburst-proof safety thickness. Based on the results of numerical calculation of outburst safety thickness under different working conditions, the forecasting model of outburst safety thickness was established by regression theory and a set of outburst prevention thickness prediction software system based on VC ++ development platform was established. The software interfaces theory and data samples to visualize theorizing and cumbersome computing. The software system is applied to Zhugongling tunnel of Fanba Expressway. The results show that the predicted thickness of the software is in good agreement with the actual excavation, so as to provide some references for similar tunneling projects.