|Table of Contents|

Research on Deformation Control Effect of Passive Zone Reinforcement Before Excavation of Deep Foundation Pit in Soft Soil(PDF)

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

Issue:
2021年06期
Page:
71-79
Research Field:
软土基坑设计与变形控制
Publishing date:

Info

Title:
Research on Deformation Control Effect of Passive Zone Reinforcement Before Excavation of Deep Foundation Pit in Soft Soil
Author(s):
YU Zhi-hai1;  WU Xu-jun2;  CAO Wen-zhao3
(1. Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China; 2. Shenzhen Branch of China Jingye Engineering Co., Ltd., Shenzhen 518055, Guangdong, China; 3. Central Research Institute of Building and Construction(Shenzhen)Co., Ltd., Shenzhen 518055, Guangdong, China)
Keywords:
soft soil;  deep foundation pit;  passive zone;  reinforcement before excavation
PACS:
TU447
DOI:
10.19815/j.jace.2021.08056
Abstract:
Based on a practical project, three kinds of finite difference numerical models with different stratum parameters were established by using FLAC 3D software. It was verified that the hardening model was more suitable than the Mohr-Coulomb model in foundation pit engineering, and the effect of skirt edge reinforcement and full pit bottom reinforcement was explored. Besides, based on the idea of passive zone reinforcement at the bottom of foundation pits, advanced reinforcement of excavation section in deep foundation pits in soft soil was proposed to control the deformation of retaining structure. The results show that the hardening model is more suitable than the Mohr-Coulomb model in foundation pit engineering. The reasonable reinforcement width of skirt edge reinforcement is 0.5h(h is the excavation depth), and the reasonable reinforcement depth is closely related to the stratum conditions at the bottom of the pit. The reasonable reinforcement depth of the full pit bottom reinforcement is 0.3h. In some cases where the displacement of the foundation pit is strictly controlled, when the reinforcement depth is more than 0.5h, reinforcement priority can be given to the soil between the last brace and the bottom of the pit. The full pit bottom reinforcement can make the position of the first brace move down, which provides a feasible scheme to reduce the number of braces. This study provides a reference for similar engineering design and further enriches the control measures of deep foundation pit deformation in soft soil area.

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Last Update: 2021-11-01