|Table of Contents|

Research on influence of different bottom reinforcement forms on deformation of pipe gallery excavation(PDF)

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

Issue:
2025年01期
Page:
179-190
Research Field:
岩土工程
Publishing date:

Info

Title:
Research on influence of different bottom reinforcement forms on deformation of pipe gallery excavation
Author(s):
SONG Xugen1; 2;  ZHEN Jie2;  ZHU Mengjun1;  WANG Zhiyong1;  YI Fan2;  LEI Huayang2;  ZHENG Gang2;  CHENG Xuesong2
(1. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China; 2. Department of Civil Engineering, Tianjin University, Tianjin 300072, China)
Keywords:
soft soil area;  pipe gallery excavation;  finite element simulation;  bottom reinforcement form;  excavation deformation
PACS:
TU433
DOI:
10.19815/j.jace.2022.09033
Abstract:
Based on PLAXIS 3D finite element software, aiming at a pipe gallery excavation project in Nansha, Guangzhou, the influence of reinforcement parameters such as area replacement rate, reinforcement width d and reinforcement depth h of strip reinforcement, grid reinforcement, skirt reinforcement and full house reinforcement on the deformation of foundation pit(lateral displacement of retaining structure, surface settlement and basal heave)was systematically analyzed, and the limit values of reinforcement parameters were obtained. The results show that different reinforcement forms and reinforcement parameters have different control effects on excavation deformation. There are reinforcement depth limits in the four reinforcement forms. The reinforcement depth limit of strip reinforcement is 0.8H(H is excavation depth). The reinforcement depth limit of grid reinforcement and full house reinforcement to control the deformation of retaining structure and surface settlement is 0.6H, the reinforcement depth limit to control the basal heave of excavation is 0.8H, and the control effect is remarkable when the reinforcement depth of skirt reinforcement is greater than 0.6H. There is no reinforcement width limit for strip reinforcement and skirt reinforcement. The width of the strip reinforcement has no effect on the deformation of the excavation. Increasing the width of the skirt reinforcement, the control effect of the lateral displacement of the retaining structure and the surface settlement increases linearly. When the reinforcement width is greater than 0.39B(B is excavation width), the control effect of the basal heave is significant. However, the skirt reinforcement will make the central heave of the bottom bulge, and the reinforcement width generally does not exceed 0.3B.Therefore, it is not recommended to use the skirt reinforcement in the soft soil excavation project. There is a limit value of reinforcement area replacement rate for strip reinforcement and grid reinforcement. The area replacement rate limit of strip reinforcement to control the various deformation is 66.67%. When the longitudinal area replacement rate of grid reinforcement is 64.29%, there is a reinforcement area in the central axis, and the shape of the basal heave curve is “M” type, and the reinforcement effect is better. When the reinforcement area is the same, the reinforcement effect from large to small is strip reinforcement, grid reinforcement and skirt reinforcement. When the reinforcement volume is the same, the reinforcement effect from large to small is full reinforcement, strip reinforcement and grid reinforcement.

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Last Update: 2025-01-20