摘要
共用围护结构的深基坑在开挖时会相互影响相互制约,也会对周边环境造成叠加影响。本文基于城际铁路前海站交通枢纽共墙深基坑工程,通过现场监测数据分析共墙深基坑在开挖阶段的围护结构变形特性及周边地表沉降规律,并根据现场监测数据对数值模型进行验证,再利用验证后的数值模型对同步开挖工序下共用地连墙的变形特性和地表沉降规律进行分析。结果表明:共墙深基坑非同步开挖时,共用围护墙会向先开挖的基坑侧偏移,坑边地表沉降也会因相邻基坑开挖而增加;同步开挖时,共用围护墙会向支撑刚度较小的基坑侧偏移,但偏移值远小于非同步开挖,地表沉降也明显减小,理想条件下可优先考虑同步开挖。
The excavation of deep foundation pits with shared enclosure structures will influence each other and restrict each other,and will also have superimposed impacts on the surrounding environment.Based on the project of deep foundation pits with common wall of the Qianhai station traffic hub of intercity railway,the deformation characteristics of the enclosure structure and the surrounding surface settlement law of the common wall deep foundation pit during the excavation stage are analyzed through on-site monitoring data,and so the numerical model is verified.Then,the deformation characteristics and surface settlement law of the common ground connecting wall under the simultaneous excavation process are analyzed using the verified numerical model.The results show that during asynchronous excavation of deep foundation pits with common wall,the common retaining wall will shift to the side of the first excavated foundation pit,and the surface settlement of the pit side will also increase due to the excavation of adjacent foundation pits;the shared retaining wall will be offset to the side of the foundation pit with less supporting stiffness,but the offset value is much smaller than that of asynchronous excavation,and the surface settlement is also significantly reduced.Under ideal conditions,synchronous excavation can be given priority.
作者
孙梦尧
陈保国
秦善良
SUN Mengyao;CHEN Baoguo;QIN Shanliang(China University of Geosciences,Wuhan 430074,Hubei,China;Sinohydro Bureau 7 Co.,Ltd.,Chengdu 610081,Sichuan,China)
出处
《工程建设》
2023年第2期1-7,共7页
Engineering Construction
基金
中国电建集团铁路建设有限公司科技项目经费资助(STT-SJQ-SG0022020-KY-001)。
关键词
深基坑
共墙
现场监测
变形特性
数值模拟
deep foundation pit
common wall
field monitoring
deformation characteristic
numerical simulation
