Numerical simulation on safe thickness in tunnel with a karst cave filled with high pressure water in Xuyong to Dacun railway
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摘要: 以隧道前方高压充水溶洞为研究对象,将叙(永)大(村)铁路某岩溶隧道作为工程背景,采用数值模拟的研究手段,通过较为全面系统的模拟分析,研究多级水压,不同围岩级别条件下隧道围岩稳定性,确定隧道施工安全厚度值,并分析总结出水压因素是较围岩级别因素更主要影响安全厚度值的结论,为隧道的安全施工及灾害防治与预警提供借鉴与参考。Abstract: Karst cave with high pressure water in tunnel is taken as a study case, some karst tunnel belonging to the railway from Xu Yong to Da Cun is taken as background, the method called numerical simulation is applied, compre- hensive and systematic simulation analysis is made, then the stability of surrounding rock of the tunnel in the condition of different water pressures and different classifications of surrounding rock is studied. As a result, the safe thickness is determined, and the conclusion that water pressure, compared with classification of surrounding rock, is the main factor influencing safe thickness is drawn, which can be taken as a reference to safe construction as well as hazard prevention and early warning.
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