Abstract：Limited by the pile position of suzhou bridge on the upper side of the tunnels, the left and right lines of the shield tunnel between Wanshousi station and Suzhou bridge station of Beijing metro line 16 are arranged in overlapping pattern. The length of the overlapping section is 1km and the vertical spacing of the tunnel is only 1.6～4.0m. The construction of the upper shield tunnel will have a negative effect on the safety of the lower formed tunnel structure. The corresponding computational models were established for different overlapping segments, the influence of the excavation of upper shield tunnel on the deformation of the surrounding strata and the lower shield tunnel was analyzed by using 3D numerical simulation method, and the protection measures of the lower formed tunnel were put forward, that was, grouting was used to reinforce the soil between the two tunnels, and steel support was used to reinforce the lower tunnel before the upper tunnel passes through the lower tunnel, the steel support structure system and the supporting installation trolley were developed. The monitoring results of the steel support system show that the protective measures for the lower tunnel structure are effective.
李兆平 王凯 姜厚停 杨康. 长距离叠落盾构隧道施工对#br#
已成型隧道影响及控制措施研究[J]. 土木工程学报, 2020, 53(S1): 174-179.
Li Zhaoping Wang Kai Jiang Houting Yang Kang. The influence of long distance overlapping shield tunnel #br#
construction on the formed tunnel and appropriate countermeasures. 土木工程学报, 2020, 53(S1): 174-179.
