考虑时空效应软土地区深基坑开挖变形分析
摘要:以天津软土地区某深基坑工程为背景，对基坑开挖过程中不同工况下支护桩深层水平位移、支护桩竖向位移、周边建筑竖向位移、周边地表竖向位移的现场监测数据进行归纳总结，分析其变化规律，对其所受到的时空效应的影响进行研究，研究结果表明：基坑开挖施工对支护桩及周边环境具有显著的时空效应影响，位移主要发生在土方开挖阶段，尤其是土方开挖阶段第三步，位移增量较大，变化速率较快，在基坑底板施工完成后，位移逐渐趋于稳定；支护桩深层水平位移呈现出“鼓肚”状变化趋势，位移最大值出现在开挖面附近；周边地表位移最大值点出现在距离基坑边6 m（即0.51H）位置处，位移变化曲线呈盆状，至基坑地下结构施工完成时，最大位移出现在DB2-3监测点，位移值为-22.7 mm，约为0.19H%；提出建议在基坑南侧和西侧采用桩锚支护结构取代原设计支护形式的优化措施，研究成果可为类似工程提供参考。
Abstract:Based on a deep foundation pit project in Tianjin soft soil area,the in-situ monitoring data of deep horizontal displacement and vertical displacement of supporting pile,vertical displacement of the surrounding building and the surrounding ground are summarized in the process of foundation pit excavation,the change rules of them are analysed,the influences of the time-space effect are studied.The study results show that the foundation pit excavation have significant space-time effect on supporting piles and surrounding environment,the displacement occurs mainly in the stage of excavation,especially in the third stage of excavation,the increment of displacement is greater,the rate of change is faster,after the foundation pit floor construction is completed,the displacement tends to be stable;The deep horizontal displacement of the supporting pile shows the trend of “bulging”,the maximum displacement occurs near the excavation surface;The maximum surrounding surface displacement is located at the position of 6 m(0.51H) from the foundation pit,the displacement curve shows a basin shape,when the underground structure of foundation pit is completed,the maximum displacement occurs at the DB2-3 monitoring point,the displacement valueis -22.7 mm(about 0.19 H%);It is suggested that the pile-anchor retaining structure replaced the original design support form in the south and west side of the foundation pit,the research results can provide references for similar projects.
中文标题：
考虑时空效应软土地区深基坑开挖变形分析
Analysis and Study of Deformation of Foundation Pit Excavation in Soft Soil Considering Time-space Effect
作者：
陈涛1,宋静2,翟超1
Chen Tao1,Song Jing2,Zhai Chao1
作者简介:陈涛，男，1985年生，汉族，安徽滁州人，硕士，工程师，主要从事基坑监测方面的工作。E-mail：496979570@qq.com
通讯地址：
1. 天津市勘察院, 天津 300191; 2. 昆山市财政局, 江苏昆山 215300
1.TianjinInstituteofGeotechnicalInvestigationandSurveying,Tianjin300191,China; 2.KunshanFinanceBureau,Kunshan215300,Jiangsu,China
中图分类号:TU473
doi:10.3969/j.issn.1007-2993.2019.03.006
出版物：岩土工程技术
收稿日期:2018-07-02
网络出版日期:2021-07-06
关键词:软土,深基坑开挖,变形监测,时空效应
Key words:soft soil,deep foundation pit excavation,deformation monitoring,time-space effect
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