ZHOU Jian-chun1,2, WEI Qin2, XIONG Xue-xiang2, FAN Xiang-yu2
1.Department of Civil Engineering, Xinjiang Institute of Technology, 830091, Urumqi, China; 2.School of Civil Engineering and Transportation, South China University of Technology, 510640, Guangzhou, China
Abstract：
Affected by geological, hydrological and land drainage, tunnel portal sections are mainly in bad areas such as severe weathering, weak surrounding rock or shallow buried, so it's easy to occur that local slide and higher security risk in tunnel construction process, and such accidents can be seen often but more easily be ignored in projects. The initial support damage caused by upward slope collapse in a highway tunnel are introduced, and the retrofit and repairment technology for existing initial support at tunnel portal sections and construction monitoring application are discussed also in the paper, the relevant conclusions can be referenced for similar practice.
