|Table of Contents|

Deformation Characteristics of Underwater Excavation of Deep Foundation Pit and Optimization of Sub-warehouse at Foundation Pit Bottom(PDF)

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

Issue:
2019年06期
Page:
95-103
Research Field:
Publishing date:

Info

Title:
Deformation Characteristics of Underwater Excavation of Deep Foundation Pit and Optimization of Sub-warehouse at Foundation Pit Bottom
Author(s):
LI Bo1 WANG Gui-he1 LYU Gao-feng2 WANG Yun-chao3
(1. School of Engineering and Technology, China University of Geosciences(Beijing), Beijing 100083, China; 2. Beijing Metro Construction Administration Corporation Ltd., Beijing 100068, China; 3. The Architectural Design and Research Institute of Henan Province Co., Ltd., Zhengzhou 450014, Henan, China)
Keywords:
deep foundation pit underwater excavation numerical simulation wall deformation sub-warehouse wall layout form
PACS:
TU470
DOI:
-
Abstract:
Based on the deep foundation pit project of Yongding Gate Outside Station of Beijing Metro Line 8, the underwater excavation method of deep foundation pit in water-rich sandy pebble stratum with high water level, large thickness and strong permeability was introduced. By means of numerical simulation, the numerical model of underwater excavation of deep foundation pit was constructed. The model was validated by the measured data. Based on the model, the characteristics of surface settlement outside the pit, horizontal displacement and deformation of the wall in the process of underwater excavation of deep foundation pit were analyzed. The results show that for foundation pit engineering in water-rich sandy cobble stratum, the underwater excavation and sub-warehouse technology at the bottom of pit can effectively control the deformation of foundation pit. The surface settlement outside the pit mainly occurs in the stage of dry excavation and dredging excavation, and the surface settlement caused by underwater excavation only accounts for about 7% of the total deformation. The setting of sub-warehouse wall can effectively limit the uplift of the bottom of pit and the deformation of the middle and lower part of the foundation pit. The wall deformation is bow-shaped under the action of the upper support and the lower part of the sub-warehouse wall. Most of the wall deformation occurs in the stage of dry excavation and dredging excavation. The wall deformation caused by underwater excavation only accounts for about 10% of the total deformation. The number of warehouses and the layout of warehouses affect the deformation of the middle and lower part of the wall. When the number of warehouse increases to a certain number(20 warehouses), the wall deformation can be controlled obviously. The warehouse can be reduced to 12 warehouses when the requirements of anti-floating are satisfied. When the number of warehouses is fixed, the transverse layout is more advantageous to control the wall deformation than the longitudinal layout.

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Last Update: 2019-11-26