基于能量守恒原理的跨活动断层隧道抗错断设计方法研究

Study on the anti-breaking design method of tunnel across active fault based on the energy balance method

强震区跨活动断层隧道科学设计与合理设防是一个难点,为此基于能量守恒原理,对断层错动作用下隧道的抗错断设计方法进行研究。通过对隧道破坏过程的能量分析,获得隧道结构的可释放应变能理论公式;提出跨活动断层隧道的抗错断设计思路,并建立设计方法;经实例应用并结合数值仿真验算,运用设计方法所得隧道结构的最小安全系数较规范值大18.5%,这说明所建立的设计方法可用于跨活动断层隧道的抗错断设防设计,并偏于保守。研究成果可为高烈度艰险山区跨活动断层隧道抗错断性能的提升提供参考。

The scientific design and reasonable fortification of the cross-active fault tunnel in the strong earthquake area was a difficult point.For this reason,based on the principle of energy conservation,the anti-breaking design method of the tunnel under faults was studied.Through the energy analysis of the tunnel failure process,the theoretical formula of the releasable strain energy of the tunnel structure was obtained.The anti-breaking design idea of the cross-active fault tunnel was proposed and the design method was established.The application was combined with numerical simulation and calculation.The minimum safety factor of the tunnel structure obtained by the design method was 18.5%larger than the norm value,which indicates that the established design method can be used for the anti-breaking design of the cross-active fault tunnel and was conservative.The research results can provided reference for the improvement of the anti-breaking performance of high-risk mountainous cross-active fault tunnels.