隧道坍方突发事件风险原因统计及范例推理

Statistics of tunnel collapse accidents and its assessment based on case reasoning

为了解浏阳河隧道某地段的坍方风险,对已有坍方隧道实例的原因进行统计分析,并对主要原因进行力学解释,进一步应用范例推理评估浏阳河隧道坍方的风险。研究结果表明:隧道坍方的主要诱因是围岩破碎和降雨,这与断层破碎带处的围岩力学性能差、降水恶化围岩力学性质和降低围岩有效应力等有关,从而更易屈服失稳;浏阳河隧道范例推理的坍方风险为很有可能发生坍方,建议在该地段施工中应注重监测信息的反馈并做好超前地质预报。

In order to realize the collapse risk condition of Liuyang River Tunnel, statistical analysis causes of collapse was conducted from a lot of tunnel collapse examples. The main reasons were further explained in a mechanical way. Collapse risk of Liuyang River Tunnel was assessed by the application of case - based reason- ing. The results show that the main incentive for the tunnel collapse is weak rock and rainfall, for weak rock has very poor mechanical properties and rainfall will weaken rock mechanics and reduce the effective stress in sur- rounding rock, et al. Thus it is easy to yield and become more instable ; collapse risk of Liuyang River Tunnel is likely to occur. Monitoring information feedback and geological prediction are proposed to be paid more atten- tion.