|
|
|
| Numerical simulation and field measurement analysis of coastal structures under immersed tunnel trench excavation |
| LIU Liying, OU Zhenfeng*, YANG Chunshan, DUAN Shanglei
|
Guangzhou Municipal Engineering Design &
Research Institute Co., Ltd., Guangzhou 510060, Guangdong, China |
|
|
|
|
Abstract In order to reveal the deformation characteristics of the adjacent structures induced by immersed tunnel trench excavation, the Ruyifang Radioactive System Project in Guangzhou was taken as the background to analyze the deformation law of the adjacent plant buildings and the reinforced revetment during the foundation excavation by 3D-dimensional simulation and field measurement. The research results showed that the soil on the slope surface of the foundation trench moved as a whole towards the direction of the foundation trench, with a maximum displacement of 23.65 mm along the direction of the foundation trench, occurring at the point of slope change in the middle of the slope; The excavation of the foundation trench induces the overall tilting of the factory building towards the riverbed, and the displacement of the factory building increased with the depth of the foundation trench excavation and eventually stabilized,the numerical results were consistent with the measured results,the maximum measured settlement of the factory building was 5.66 mm, and the maximum vertical displacement of the factory building in the direction of the embankment calculated numerically was 8.13 mm, the maximum ratio of the settlement difference between adjacent column foundations to the column spacing was 0.264‰, which met the requirements of the standard limit and ensured the safe operation of the factory building; The reinforced revetment deformed mainly in the vertical direction of the embankment with the variations of small at both ends and large in the middle and the maximum of 7.98 mm generating in the revetment top middle; The installation of steel sheet piles and foundation grouting at the top of the slope could effectively reduce the deformation of the factory structure, with a significant reduction in settlement. Compared with no measures taken, the simultaneous installation of steel sheet piles and grouting reinforcement could reduce the settlement of the factory structure by about 25%.
|
|
Received: 30 August 2024
Published: 08 January 2025
|
|
|
|
|
|
|
|
