摘要
综合考虑深基坑支挡结构-内支撑结构-土体空间整体协同作用,运用Midas GTS软件对武汉长江Ⅰ级阶地采用钻孔灌注桩+内支撑支护结构的某深基坑进行三维建模,选用修正摩尔库伦理论进行有限元计算,对考虑承压水和不考虑承压水两种情况下基坑开挖全周期进行数值模拟,演示桩撑支护结构的深基坑施工中开挖、加撑、降水全过程的位移与内力的变化情况。通过数据分析得出降水对基坑及周边土体的沉降影响,分析考虑承压水和不考虑承压水支护桩水平位移、立柱桩竖向位移、支护桩和内支撑的变形和受力特征,为进一步优化设计提供技术支撑。
The combined action of the deep excavation supporting structure,internal struts and the adjacent soils is numerically simulated by using MIDAS GTS software.A deep excavation in the first terrace of Yangtze River used cast-in-pace bored tangent piles plus internal strut as the supporting structure and its three-dimensional finite element analysis model with modified Mohr-Coulomb constitutive soil model is established.The entire excavation process was numerically simulated under the assumptions of artisan and non-artisan groundwater conditions.The deformation and internal force variations in the supporting structure during the excavation,strut installation,and dewatering process are simulated.The impact of the dewatering on the excavated area and the settlement of adjacent soils are evaluated.The deformation and stress of the supporting structure including the horizontal struts under various working conditions are discussed.The analytical results provide technical supports for the excavation optimization design.
作者
帅红岩
邵勇
李光诚
王建筱
SHUAI Hongyan;SHAO Yong;LI Guangcheng;WANG Jianxiao(Hubei Institute of Urban Geological Engineering,Wuhan 430050)
出处
《土工基础》
2023年第6期954-958,共5页
Soil Engineering and Foundation
关键词
长江Ⅰ级阶地
深基坑
支护桩
内支撑
数值模拟
承压水
First Terrace of Yangtze River
Deep Excavation
Soldier Piles
Internal Support
Numerical Simulation
Artisan Groundwater
