|Table of Contents|

Simulation analysis of fluctuation characteristics of underwater perfusion seal bottom of large diameter caisson(PDF)

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

Issue:
2025年05期
Page:
200-208
Research Field:
岩土工程
Publishing date:

Info

Title:
Simulation analysis of fluctuation characteristics of underwater perfusion seal bottom of large diameter caisson
Author(s):
JIAN Wenhao1; 2;  SHI Wenhao1; 2;  DENG Wei1; 3;  WANG Yuan1; 2;  FAN Lyuye2; 4
(1. School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, Jiangsu, China; 2. Kunshan Underground Space Technology Research Institute Co., Ltd, Suzhou 215337, Jiangsu, China; 3. CSCEC International Construction Co., Ltd. Suzhou 215000, Jiangsu, China; 4. Kunshan Construction Engineering Quality Inspection Center Co., Ltd, Suzhou 215337, Jiangsu, China)
Keywords:
large diameter caisson;  fluctuation characteristic of seal bottom;  numerical simulation;  underwater concrete perfusion
PACS:
TU943
DOI:
10.19815/j.jace.2023.11063
Abstract:
In order to address the problem of underwater concrete perfusion seal bottom of caisson, relying on the caisson project of underground silo parking garage in Kunshan Forest Park, a numerical model of underwater concrete perfusion of caisson was constructed based on the discrete element method of PFC, and the process of underwater concrete perfusion seal bottom of caisson was simulated. By introducing the relative fluctuation parameter, the fluctuation characteristics of seal bottom layer were quantitatively analyzed, and the influence laws of conduit arrangement scheme, height of groundwater table, and temperature of groundwater on the fluctuation characteristics of seal bottom layer were revealed. The results show that it is feasible to simulate the concrete bottoming process by gradually raising conduit method during underwater perfusion. Under the same condition, the denser the conduit arrangement is, the smaller the relative fluctuation of seal bottom layer is, and the less obvious the fluctuation characteristics are. The higher the groundwater table is, the greater the fluctuation of seal bottom layer is, the lower the water level is, and the more uniform the seal bottom layer is. Within the allowable scope of project, appropriately lowering the groundwater table is helpful to reduce the relative fluctuation of seal bottom. The change of groundwater temperature has a small influence on the relative fluctuation of seal bottom layer.

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Last Update: 2025-09-25