Strategy and analysis of the settlement and deformation caused by#br#
dewatering under complicated geological condition
Zheng Gang1,2 Zhao Yuebin1,2 Cheng Xuesong1,2 Ha Da1,2 Li Qinghan1,2
1. Minisry of Education Key Laboratory of Coast Civil Structures and Safety, Tianjin University, Tianjin 300072, China;
2. School of Civil Engineering, Tianjin University, Tianjin 300072, China
Abstract： If the arrangement of the curtain is unreasonable in deep foundation, the hydraulic connection of both side of the foundation will still exist, which lead to the ground settlement and the deformation of the diaphragm wall. In an engineering of Tianjin 5th metro station, the condition is complicated and many lens are discovered in the discontinuous aquifer. Pre-dewatering test was carried out before the excavation to judge the foundation hydraulic connection. This paper made an observation about the pre-dewatering test. After analyzing, it can be included that there's hydraulic connection in both side of the diaphragm wall. The different confined aquifer has hydraulic connection, either. The confined aquifer can’t be truncated by the curtain, which caused ground settlement and clear deformation of the diaphragm wall. Therefore, in the complicated condition, pre-dewatering test before the excavation and pumping during the geological survey should be carried out to judge the connection of the aquifer and the geological condition. To decrease the ground settlement, recharge well should be built before pumping. Building the first lateral support construction can improve the lateral stiffness and reduce the deformation of the diaphragm wall caused by dewatering effectively.
郑 刚 赵悦镔 程雪松 哈 达 栗晴瀚. 复杂地层中基坑降水引发的水位及沉降分析与控制对策[J]. 土木工程学报, 2019, 52(S1): 135-142.
Zheng Gang Zhao Yuebin Cheng Xuesong Ha Da Li Qinghan. Strategy and analysis of the settlement and deformation caused by#br#
dewatering under complicated geological condition. 土木工程学报, 2019, 52(S1): 135-142.
