摘要
为准确评估软土地区基坑施工安全以及对周围环境的影响,开挖过程中的时间和空间影响因素不可忽视。以长江漫滩软土地区某深基坑开挖工程为依托,首先建立考虑顺逆结合施工过程的有限元模型,将地连墙水平位移的计算值与实测值进行对比,验证有限元计算的可靠性;基于理论分析、数值计算和实测数据,采用坑角效应影响系数和等效水平抗力系数来衡量时空效应对支护变形的影响,提出考虑时空效应的地连墙变形计算方法;通过工程实例验证了在软土地区基坑设计计算中考虑时空效应的必要性以及所提计算方法的合理性。该研究成果可为软土地区深基坑变形计算提供有益借鉴。
To accurately evaluate the safety of foundation pit construction in soft soil area and its impact on the surroundings,the time and space influencing factors during excavation cannot be ignored.In this paper,based on the excavation of a deep foundation pit in the soft soil area of the Yangtze River floodplain,a 3D finite element model was established considering the combination of bottom-up and top-down constructions,and the calculated values of horizontal displacement of the diaphragm wall were compared with the measured values to verify the reliability of the finite element calculation.Based on theoretical analysis,numerical calculation and measured data,the influence coefficient of corner effect and equivalent horizontal resistance coefficient were used to measure the influence of spatio-temporal effect on the deformation of supporting wall,and the calculation method of the diaphragm wall deformation considering spatio-temporal effect was proposed.The necessity of the spatio-temporal effect and the rationality of the proposed method in the design of foundation pit in soft soil area were verified by engineering examples.The results can provide beneficial reference for the calculation of deep foundation pit deformation in soft soil area.
作者
张坤勇
张梦
孙斌
李福东
简永洲
ZHANG Kun-yong;ZHANG Meng;SUN Bin;LI Fu-dong;JIAN Yong-zhou(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,Jiangsu 210024,China;Geotechnical Research Institute,Hohai University,Nanjing,Jiangsu 210024,China;Jiangsu Zhongshe Group Co.Ltd.,Wuxi,Jiangsu 214072,China;China Communications Construction Co.,Ltd-Second Highway Bureau Fourth Engineering Co.,Ltd.,Luoyang,Henan 471000,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2023年第8期2389-2399,共11页
Rock and Soil Mechanics
基金
国家自然科学基金(No.41530637)。
关键词
基坑开挖
数值模拟
时空效应
支护变形计算
foundation pit excavation
numerical simulation
spatio-temporal effect
supporting structure deformation calculation
