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| Research on the Effect Mechanism of Cavity behind Tunnel Lining under the Earthquake Action |
| ZHU Zheng - guo，GENG Ya - shuai, WU Jie, ZHU Yong - quan, WANG Dao - yuan, HAN Xian - min |
| (Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043 , China) |
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Abstract Research purposes ： Cavity behind tunnel lining has great effects on tunnel anti - seismic. Based on the background of the Kuokesa tunnel of Dunhuang to Geermu in high intensity seismic region, this paper studies the effect mechanism on seismic dynamic response of tunnel structure with factors such as the location of cavity behind tunnel lining, cavity size, surrounding rock grade and depth, and proposes the rational reinforcement plans to ensure the operational safety of tunnel under the earthquake action.
Research conclusions: (1) Cavity reduces the defomation perfomance and seismic property of lining structure.
(2) The most sensitive factor is surrounding rock grade, following are cavitys hoop size, location, radial size and axial size, and tunnel depth is the least intensive factor. ( 3 ) The grouting reinforcement scheme can reduce tensile stress, and improve the intenal and stress distribution on tunnel lining. The effect of backfilling grouting + reinforcement with arch surround is better than that of backfilling grouting + bolt, the scheme of backfilling grouting + reinforcement with arch surround + bolt has the best anti - seismic effect. (4) The research results have some guiding significance on effect mechanism and optimized reinforcement project selection of cavity behind tunnel lining under the earthquake action.
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Received: 12 June 2015
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2015, Vol. 32 
