|Table of Contents|

Research on deformation characteristics of deep excavations in upper-soft and lower-hard composite strata during construction period based on unit tracking method(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年06期
Page:
177-187
Research Field:
岩土工程
Publishing date:

Info

Title:
Research on deformation characteristics of deep excavations in upper-soft and lower-hard composite strata during construction period based on unit tracking method
Author(s):
XU Wentian1;  WANG Yanhong1;  ZHANG Yu1;  MEI Yuan2;  LIU Wenzhan2; 3;  ZHOU Dongbo2
(1. Guangzhou Metro Design & Research Institute Co., Ltd, Guangzhou 510010, Guangdong, China; 2. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China; 3. China Construction Second Engineering Bureau Co., Ltd. Central China Company, Wuhan 430056, Hubei, China)
Keywords:
deep excavation;  upper-soft and lower-hard composite strata;  enclosure structure;  precipitation;  deformation characteristic;  element tracking method
PACS:
TU74
DOI:
10.19815/j.jace.2024.11032
Abstract:
In order to study the deformation characteristics of deep foundation pit in soft-hard composite stratum under the influence of precipitation, and to solve the problems of low modeling accuracy and non-real rebound of traditional element birth and death method, a numerical model was established by combining porous elastic model and modified Cambridge model based on the foundation pit project of railway part of Tangxi integrated hub in Guangzhou. The unit tracking method(employing co-node element replication and dynamic material property allocation, achieving integrated modeling of retaining structures, strata, and internal supports)was used to simulate the seepage effects induced by dewatering and the impact of construction on excavation deformation,and the effects of dewatering on pore pressure and soil deformation were analyzed. The results show that the excavation deformation is primarily caused by dewatering-induced consolidation and soil unloading within the pit. The lateral deformation of the retaining structure transitioned from linear to a “C-shaped” non-linear pattern, with maximum displacements of 39.65-43.51 mm. The ground settlement behind the wall increases significantly, and the maximum settlement reaches 45.69 mm, and the range of settlement affected area is 1.0 times to 1.5 times of the excavation depth. Under the condition of dewatering, the axial force of the support changes significantly, and the axial force of the second support reaches 2 126.3 kN and 2 189.3 kN respectively under the two working conditions. After applying 300 kN prestress, the deformation of the foundation pit is effectively controlled, and the rationality and practical value of the scheme are verified.

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Last Update: 2025-11-25