摘要
高速公路桥下基坑开挖支护结构的变形与稳定性直接影响邻近桥墩等建构筑物的安全运营。某箱涵基坑紧邻已建立交桥5、6号桥墩,周围环境较复杂,施工净空小,水平方向上与已建桥梁桥墩相距较近,如果没有充分的保护措施,在箱涵基坑开挖施工中将会对已建桥梁产生影响,后果严重。基于MIDAS/GTS分析了支护结构体系的内力和变形分布规律,同时采用FLAC3D软件模拟设置支撑体系后,基坑开挖过程中桥墩变形的规律,以评估支撑体系设置效果。通过对箱涵施工深基坑支护方案进行研究与安全稳定性评价,可为下穿公路的深基坑变形和稳定性设计和验算提供理论支撑,为类似的工程提供参考。
The deformation and stability of an excavation support structure under an expressway bridge viaduct will like directly affect a safe operation of adjacent piers and other structures nearby.A box culvert to be construction would be very close to the bridge viaduct piers No.5 and No.6.This box culvert would be constructed in a complicated and constrained environment with small vertical clearance and it would affect the safety of the bridge if an appropriate protective measure was not implemented.The stress and deformation of the excavation supporting structure were analyzed through a commercial finite element method software MIDAS-GTS.Further,the deformation of the bridge pier during the entire excavation process was simulated by FLAC3 Dsoftware after the supporting structure was installed.So that the role of supporting structure could be appropriately evaluated.Throughout the evaluation of the safety and the stability of the evaluation of the deep excavation supporting structure for the box culvert construction,the results and experience can provide an important theoretical support for the design and validation of the deformation and stability of deep excavation near the active under highway,and also provide reference for similar projects in the future.
作者
李取纲
代先尧
邹东林
汪欣怡
黄鑫
LI Qugang;DAI Xianyao;ZOU Donglin;WANG Xinyi;HUANG Xin(Hubei Transportation Investment Construction Group Co.Ltd.,Wuhan 430050;Hubei Provincial Communications Planning and Design Institute Co.Ltd.,Wuhan 430051)
出处
《土工基础》
2021年第4期453-455,462,共4页
Soil Engineering and Foundation
关键词
深基坑
变形
稳定性
Deep Excavations
Deformation
Stability
