Abstract：Research purposes： Tianping tunnel of Chongqing - Guizhou railway is 13. 928 km long，and is the key workpoint. The geostress conditions of Tianping tunnel is very complicated. When entering the construction of inclined shaft , the deformation of initial supports and baseboard was serious , by measuring the crustal stress , the inclined shaft was judged extreme - high geostress zone，which was apt to effect large deformation. So the problem was what reliable construction methods was adopted to safely pass the high geostress zone.
Research conclusions ： By the construction practice of Tianping tunnel, the paper summarized the following construction methods to guarantee the safety and quality of high geostress zone ： (1 ) Increase the deformation allowance to guarantee that the deformation of soft rock under high stress was not not beyond limit. (2 ) Strengthen monitoring measurement and predict the deformation of the surrounding rock to guide the construction. (3) Timely adjust support parameter and dynamically adapt the surrounding rock. (4 ) Timely cast the scondary linings,when deformation rate was continuously less than 1 mimd for seven days. (5) The research conclusion can provide references and lessons for constructions of similar high geostress tunnels.
王明慧，张忠爱，张桥. 渝黔铁路极高地应力隧道施工控制技术[J]. 铁道工程学报, 2015, 32(11): 93-97.
WANG Ming - hui1, ZHANG Zhong - ai2, ZHANG Qiao1. Construction Control Technitjue for High Geostress Tunnel in Chongqing - Guizhou Railway. Journal of Railway Engineering Society, 2015, 32(11): 93-97.
2015, Vol. 32 
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