Study on Reinforcement of Large Arch Foot of Mined and Overlapped Metro Transfer Stations
(1 State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074; 2 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074)
Abstract：
In view of the limited ground suitability of the arch-cover method for construction of a metro station with super-large section, taking the Min′an Avenue station of Chongqing rail ring line as the background, the finite element software MIDAS GTS is used to compare the non-reinforcement scheme, reinforcement scheme with spread reinforced concrete foundation, reinforcement scheme with reinforced concrete load transfer piles and anchorage scheme for the large arch foot structure of the station and to optimize the support parameters so as to expand the application scope of the arch-cover method. The results indicate that: (1) the reinforcement of the arch foot structure could improve the stress and deformation of the arch foot and the whole structure; (2) the anchorage scheme should be preferred after structural deformation, ground settlement, structural stress, engineering economic benefits and construction difficulty have been considered comprehensively; (3) reasonable support parameters of the anchoring scheme should be 6 m/0.50 m×0.75 m; and (4) based on the anchoring scheme, the combined action of steel arch frame, side wall bolts and arch foot structure reinforcement could guarantee the safety of station structure.
HUANG Peng1,
2 WEI Liangwen1,
2 ZHANG Xuefu1 etc
.Study on Reinforcement of Large Arch Foot of Mined and Overlapped Metro Transfer Stations[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(6): 137-147
2021, Vol. 58 