摘要
为研究被动区溶洞对于深基坑工程的影响,以大连地铁五号线某车站深基坑工程为依托,运用有限元软件ABAQUS建立被动区不同溶洞条件下的基坑分步降水开挖模型。结果表明基坑开挖会形成凹槽形沉降区,地表沉降最大值点会随着溶洞截面宽度的增加,呈现远离基坑的趋势。随着溶洞截面宽度的增加,溶洞与围护桩水平距离减小,溶洞对基坑稳定性影响逐步增大,需要提高对支护变形和地表沉降的监控频率。
The deep foundation pit engineering of a station on Dalian Metro Line 5 is taken to study the impact of passive zone karst caves on deep foundation pit engineering.A stepwise dewatering excavation model of foundation pit under different conditions of passive zone karst caves is established using the finite element software ABAQUS.The results show that foundation pit excavation forms a groove shaped settlement zone,and the maximum point of surface settlement tends to be far away from the foundation pit as the width of the karst cave section increases.As the section width of the karst cave increases,the horizontal distance between the karst cave and the retaining pile de-creases;the impact of the karst cave on the stability of the foundation pit gradually increases.Therefore,it is neces-sary to increase the monitoring frequency of support deformation and surface settlement.
作者
周诺
白海峰
任昆
ZHOU Nuo;BAI Haifeng;REN Kun(School of Civil Engineering Dalian Jiaotong University,Liaoning Dalian 116028,China)
出处
《低温建筑技术》
2023年第5期62-66,72,共6页
Low Temperature Architecture Technology
基金
辽宁省教育厅2021年度科学研究经费(LJKZ0502)
大连市支持高层次人才创新创业项目(2021RQ083)。
关键词
被动区溶洞
基坑工程
有限元分析
地表沉降
passive zone karst caves
foundation pit engineering
finite element analysis
surface subsidence
