
2011年12月上第40卷第354期
施工技术
CONSTRUCTION TECHNOLOCY
深基坑柔性叠加支护结构施工技术
严晓新",李宗明,黄延铮2
(1.华北水利水电学院土木与交通学院,河南郑州450011;2.中国建筑第七工程局有限公司,河南郑州
450004)
【摘要]随着社会市场经济的发展,大量的高层、超高层建筑以及地下工程不断涌现,距原有建筑物的间距越来越小,支护结构的适价急剧增加。针对深基坑地下连续墙、防渗椎幕及其之间土体组成的柔性叠加支护结构,使用有限元软件ANSYS分析模拟地下连续墙的受力和变形,并以不同内支撑方式作了多方案比较,在实际工程施工中及时进行信息采集,和计算结果相比较,并界定了使用该计算方法的边界条件。工程实践表明,该结构的受力和变形
计算结果更符合工程实际,与传统计算方法相比,水平位移减少30%,从而降低支护造价20%左右。【关键调】基坑;支护结构;地下连续墙:水平位移;监测
【中图分类号】TU753
【文献标识码】A
[文章编号】1002-8498(2011)23-0081-04
ConstructionTechnologyintheSupportingStructurewithFlexible
Superposition for Deep Foundation Excavation
Yan Xiaoxin', Li Zongming', Huang Yanzheng"
(1. Civil and Traffie College, North China Uninersity of Water Resourees and Electrie Power,
Zhengzhou,He'nan 450011, China;
2. China Construction Sesenth Engineering Dirision, Corp. Ld.,Zhengzhou,He'nan450004, China)
Abstract: As the developing of economic, many super high-rise and high-rise buildings and underground engineerings appear continuously, leading to a much smaller distance between existed buildings and a higher cost of supporting structure. Based on underground diaphragm wall and anti-seepage curtain for deep foundation excavation,the supporting structure with flexible superposition composed of soil between them,finite element analysis software ANSYS is used to analyze and simulate the stress and deformation condition of underground diaphragm wall, several schemes are contrasted by different inner support patterns,the information is collected in time during practical engineering construction, compared with calculation results,the boundary conditions are defined by the calculation method. Engineering practice shows that the calculation results of the stress and deformation for the structure are more coincident with practical engineerings, compared with traditional calculation method, horizontal displacement reduces 30%,thus support cost reduces about20%.
Key words: foundation excavation; supporting structure; underground diaphragm walls; horizontal displacement;monitoring
在地下连续墙的设计和施工过程中,由于影响地下连续墙变形的因素众多,如地质条件、地下水情况、施工顺序、支护方案、工程荷载、场地周围环境等,而且这些因素存在很大的不确定性,这就导致地下连续增变形的计算结果同样存在很大的不确定性。在传统地下连续增变形的计算软件中,通过对实际工程中地下连续墙变形监测结果的对比
【收稿日期】2011-09-29
【作者商介】严凌新,华北水利水电学院土本与交通学院副教授,硕士研究生导师,河南省郑州市北环路36号450011,电话:(0371)
66350551,E-mail:yanriaxin@ ncwu, edn. cn 万方数据
81
发现,传统计算方法偏于保守,造成了很大的浪费。为了降低工程造价,避免不必要的投人,本文以某工程为例,用ANSYS有限元仿真软件,结合本工程变形实测资料进行了结构的优化分析研究,并与传统基坑变形计算软件的模拟计算结果相比较,提出更为符合实际的模拟计算方法。
1
工程概况
本工程位于上海市虹口区海伦路。基坑北临
海伦路,东对四平路.西侧及西南是儿童公园,南侧为一条现存道路,路南建有泵站。该饭店建筑物由