中文摘要：

水害给隧道结构自身和隧道内行车安全带来极大的威胁,可导致运营隧道出现塌方等事故。以韶赣高速公路白山隧道的衬砌裂损及渗漏水等病害为例,研究水害产生机理,表明隧道周边地下水的泄、排水,导致周边围岩土体流失,进一步加剧了围岩状况的恶化,使得隧道所受的围岩压力增大,渗漏水通道扩大,进而引发水害。采用MIDAS/GTS大型有限元软件分别对隧道衬砌背后及围岩的脱空、积水等现象进行数值模拟,结果表明,衬砌断面安全系数由无空洞时的5.91降为2.57,安全性明显下降。针对隧道水害机理和模拟结果,给出了工程应对建议。

英文摘要：

The water disaster could lead to a great threat to the tunnel structure and the traffic safety. In this paper,the generation mechanism of water disaster has been studied on the basis of the example of crack and water leakage and other diseases of Baishan Tunnel of Shaogan Expressway. Research results have shown that surrounding groundwater discharge,drainage,result in the loss of surrounding soil,further aggravate the condition of surrounding rock,and the surrounding rock pressure of the tunnel increase,which would lead to the expanded water leakage passage,and then water damage would be aroused. Using MIDAS/GTS finite element software,the water and void phenomenon behind tunnel lining and surrounding rock have been simulated. The results have shown that the safety factor of lining section by hole 5. 91 has been reduced to 2. 57,which means decreased safety. According to the mechanism of tunnel water damage and the simulation results,the engineering response suggestions have been provided,which would be worthy of reference for similar projects.