The fros theave deformation controlling method of an #br#
operation station caused by freezing adjacent tunnel
Li Fangzheng1,2,3 Fang Liangwen1 Wang Lei1 Ding Hang1
1. Beijing China Coal Mine Engineering Co. , Ltd. , Beijing 100013, China; 2. Construction Branch of China Coal Research Institute, Beijing 100013, China；
3. Tian Di Science & Technology Co. , Ltd. , Beijing 100013, China
Abstract：To study the development law of soil frost heave under different frost heave control methods, a tunnel of Shanghai metro line passing down the existing station was taken as the research object, and a model test bench for the interaction between frozen soil and station structure was established according to the similarity criteria. The horizontal freezing process of the tunnel construction was simulated, and the changing law of frost heave was discussed by adjusting the freezing brine temperature and pressure relief measures. The results show that, after increasing the freezing brine temperature from -28°C to -18°C, the active freezing time increases by 91%, and the frost heave force of the station base slab decreases by 16. 7%. The frost heave force of the station base slab was reduced by 26. 3% after using the pressure relief measures in triangular area. Some measures such as pressure relief in the triangle area and adjustment of freezing parameters were proposed to control the safety of station structure according to the experiment results. The application effects of different frost heave control measures were studied according to the construction monitoring data of the engineering. It is shown that, the displacement of the station base slab was reduced by 65.5% within 10 days after use pressure relief measures in the triangle area. When the freezing brine temperature was -28℃, -20℃, -10℃, the vertical displacement growth rate of the station base slab was 0.35mm/d, 0.14mm/d and 0.01mm/d, respectively. The vertical deformation rate of the station structure is significantly slowed down with the increase of the temperature of the frozen brine, which has a significant effect on the frost heave control.
李方政 方亮文 王磊 丁航. 近接隧道冻结对运营车站冻胀变形控制研究[J]. 土木工程学报, 2020, 53(S1): 292-299.
Li Fangzheng Fang Liangwen Wang Lei Ding Hang. The fros theave deformation controlling method of an #br#
operation station caused by freezing adjacent tunnel. 土木工程学报, 2020, 53(S1): 292-299.
