Study on the influence law and improvement measures of water foundation pit excavation on its enclosure structure and adjacent bridge piles
Lei Huayang1,2 Peng Zhiwen1,3 Feng Shuangxi1 Jia Rui1,2 Han Jun4 Jin Haiyan4
1. School of Civil Engineering, Tianjin University, Tianjin 300354, China; 2. Key Laboratory of Coast Civil Structure Safety of the Ministry of
Education, Tianjin University, Tianjin 300354, China; 3. Institute of Frontier Technology, Tianjin University, Tianjin 301700, China;
4. China Railway Sixteenth Bureau Group Fifth Engineering Co., Ltd., Hebei 064000, China
Abstract：The deep silt water foundation pit project adjacent to the line is increasing in China's coastal cities. In order to ensure the stability of the foundation pit and the normal use of the surrounding structures (structures), it is urgent to systematically study the deformation of the retaining structure and the stress characteristics of the adjacent bridge piles. In this paper, based on a proposed bridge project, 13 kinds of simulation conditions are determined according to different water level differences and different excavation intervals. The influence law of foundation pit excavation on retaining structure and adjacent bridge piles under different working conditions is studied systematically. Lateral deformation of the retaining structure, bending moment and lateral deformation of the adjacent pile. The research shows that with the increase of water level, the lateral deformation of the retaining structure increases gradually, and the maximum lateral deformation reaches 91.2mm. With the increase of water level difference, the maximum bending moment and lateral deformation of adjacent piles are gradually increased. However, the increase of the bending moment tends to decrease gradually; in addition, with the increase of the excavation spacing, the maximum bending moment and the maximum lateral deformation of the bridge pile are radually reduced, and the maximum positive bending moment of the pile appears. The position is at an elevation of 19.5m. This paper combines the most dangerous working conditions, optimizes the construction method, compares and analyzes the three reinforcement schemes of adding support, adding stiffness and adding support and adding stiffness, and puts forward the priority to add support and stiffening measures to reinforce the excavation of deep mud on the foundation pit. The research results of this paper can provide reference for similar projects.
雷华阳 彭志文 冯双喜 加 瑞 韩 均 靳海彦. 水上基坑开挖对自身围护结构及临近桥桩的#br#
影响规律与改进措施研究[J]. 土木工程学报, 2019, 52(S1): 143-150.
Lei Huayang Peng Zhiwen Feng Shuangxi Jia Rui Han Jun Jin Haiyan. Study on the influence law and improvement measures of water foundation pit excavation on its enclosure structure and adjacent bridge piles. 土木工程学报, 2019, 52(S1): 143-150.
