基于时空效应的深基坑工程变形规律分析
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摘要
以基坑开挖的"时空效应"为根据,对上海市陶家宅深基坑工程的监测数据进行统计分析。对各监测项目在不同施工阶段、不同空间位置的变形规律进行讨论,重点分析了基坑自身变形及周边环境的变形在不同"时空条件"下的表现形式与内在联系。结果表明:各监测项目的变形主要发生在基坑开挖阶段,底板可以有效地控制基坑自身和周围环境的变形;基坑的空间效应影响程度沿远离坑角方向衰减,且基坑长深比越大,空间效应表现得越明显;围护结构最大侧移及最大侧移出现的深度均随开挖深度的增大而增大;基坑周边地表沉降沿远离坑壁方向呈现先增大后减小的三角形变化趋势;基坑周边地表沉降与管线沉降规律大体相同,但在数值上存在一定的差别。
Based on the"space-time effect"of foundation pit excavation,the monitoring data of Taojiazhai deep foundation pit project in Shanghai were analyzed. The deformation laws of various monitoring projects at different construction stages and different spatial locations were discussed,and the manifestations and internal relations of the deformation of the foundation pit itself and the surrounding environment under different "space-time conditions"were emphatically analyzed. The results show that the deformation of each monitoring project mainly occurs in the excavation stage of the foundation pit,and the baseplate can effectively control the deformation of the foundation pit itself and the surrounding environment. The spatial effect of the foundation pit decreases along the direction away from the pit angle,and the larger the ratio of length to depth of the foundation pit,the less obvious the spatial effect is. The maximum lateral displacement and the depth of maximum lateral displacement of retaining structure increase with the increase of excavation depth. The surface settlement around the foundation pit increases first and then decreases along the direction away from the pit wall. The surface settlement around the foundation pit is basically the same as that around the pipeline,but there are some differences.
Based on the"space-time effect"of foundation pit excavation,the monitoring data of Taojiazhai deep foundation pit project in Shanghai were analyzed. The deformation laws of various monitoring projects at different construction stages and different spatial locations were discussed,and the manifestations and internal relations of the deformation of the foundation pit itself and the surrounding environment under different "space-time conditions"were emphatically analyzed. The results show that the deformation of each monitoring project mainly occurs in the excavation stage of the foundation pit,and the baseplate can effectively control the deformation of the foundation pit itself and the surrounding environment. The spatial effect of the foundation pit decreases along the direction away from the pit angle,and the larger the ratio of length to depth of the foundation pit,the less obvious the spatial effect is. The maximum lateral displacement and the depth of maximum lateral displacement of retaining structure increase with the increase of excavation depth. The surface settlement around the foundation pit increases first and then decreases along the direction away from the pit wall. The surface settlement around the foundation pit is basically the same as that around the pipeline,but there are some differences.
引文
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9 Tan Y,Wang D L.Characteristics of a large-scale deep foundation pit excavated by the centralisland technique in Shanghai soft clay.Ⅰ:bottom-up construction of central cylindrical shaft[J].Journal of Geotechnical and Geoenvironmental Engineering,2013,139(11):1875-1893
10 Tan Y,Wang D L.Characteristics of a large-scale deep foundation pit excavated by the centralisland technique in Shanghai soft clay.Ⅱ:top-down construction of the peripheral rectangular pit[J].Journal of Geotechnical and Geoenvironmental Engineering,2013,139(11):1894-1910
11 Tan Y,Wei B,Diao Y,et al.Spatial corner effects of jong and narrow multi-propped deep excavations in Shanghai soft clay[J].Journal of Performance of Constructed Facilities,2014,28(4):04014015
12胡之锋,陈健,周兴涛,等.钢支撑滞后架设对深基坑围护结构及地表沉降的影响[J].科学技术与工程,2019,19(1):213-220Hu Zhifeng,Chen Jian,Zhou Xingtao,et al.Influence of delaying installation of steel bracing on retaining wall and ground settlement of deep excavation[J].Science Technology and Engineering,2019,19(1):213-220
13刘建航.软土基坑工程中时空效应理论与实践[J].岩石力学与工程学报,1998,18(增刊1):763-770Liu Jianhang.Time-space-effect theory and practice for excavations in soft clays[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(S1):763-770
14刘兴旺,施祖元,益德清,等.软土地区基坑开挖变形性状研究[J].岩土工程学报,1999,21(4):456-460Liu Xingwang,Shi Zuyuan,Yi Deqing,et al.Deformation characteristics analysis of braced excavationon soft clay[J].Chinese Journal of Geotechnical Engineering,1999,21(4):456-460
15陶连金,代希彤,边金.盖挖逆作法地铁车站结构体系内力及变形研究进展[J].科学技术与工程,2018,18(24):188-194Tao Lianjin,Dai Xitong,Bian Jin.Advances in research on the internal force and deformation of the subway stations'structural system with cover and cut-top down method[J].Science Technology and Engineering,2018,18(24):188-194
16上海市市政工程管理局.上海地铁基坑工程施工规程:SZ-08-2000[S].上海:人民交通出版社,2000Shanghai Municipal Engineering Administration.Construction specification for foundation pitof Shanghai metro:SZ-08-2000[S].Shanghai:People’s Communications Publishing House,2000
2刘波.上海陆家嘴地区超深大基坑邻近地层变形的实测分析[J].岩土工程学报,2018,40(10):1950-1958Liu Bo.Measurement and analysis of deformation of adjacent strata super deep and large foundation pits in Lujiazui district of Shanghai[J].Chinese Journal of Geotechnical Engineering,2018,40(10):1950-1958
3 Wang J H,Xu Z H,Wang W D.Wall and ground movements due to deep excavations in Shanghai soft soils[J].Journal of Geotechnical and Geoenvironmental Engineering,2010,136(7):985-994
4丁勇春,王建华,徐中华,等.上海软土地区地铁车站深基坑变形特性[J].上海交通大学学报,2008,42(11):1871-1875Ding Yongchun,Wang Jianhua,Xu Zhonghua,et al.Deformation characteristics of deep foundation pit of subway station in soft soil area of Shanghai[J].Journal of Shanghai Jiaotong University,2008,42(11):1871-1875
5王卫东,徐中华,王建华.上海地区深基坑周边地表变形性状实测统计分析[J].岩土工程学报,2011,33(11):1659-1666Wang Weidong,Xu Zhonghua,Wang Jianhua.Statistical analysis of surface deformation characteristics around deep foundation pit in Shanghai area[J].Chinese Journal of Geotechnical Engineering,2011,33(11):1659-1666
6徐中华,王建华,王卫东.上海地区深基坑中地下连续墙的变形性状[J].土木工程学报,2008,41(8):82-87Xu Zhonghua,Wang Jianhua,Wang Weidong.Deformation characteristics of underground continuous wall in deep foundation pit in Shanghai Area[J].China Civil Engineering Journal,2008,41(8):82-87
7廖少明,魏仕峰,谭勇,等.苏州地区大尺度深基坑变形性状实测分析[J].岩土工程学报,2015,37(3):458-469Liao Shaoming,Wei Shifeng,Tan Yong,et al.Deformation analysis of large scale deep foundation pit in Suzhou Area[J].Chinese Journal of Geotechnical Engineeering,2015,37(3):458-469
8张震,叶建忠,贾敏才.上海软土地区小宽深比基坑变形实测研究[J].岩石力学与工程学报,2017,36(增刊1):3627-3635Zhang Zheng,Ye Jianzhong,Jia Mingcai.Deformation survey of foundation pit with small width to depth ratio in soft soil area of Shanghai[J].Chinese Journal of Rock Mechanics and Engineering,2017,36(S1):3627-3635
9 Tan Y,Wang D L.Characteristics of a large-scale deep foundation pit excavated by the centralisland technique in Shanghai soft clay.Ⅰ:bottom-up construction of central cylindrical shaft[J].Journal of Geotechnical and Geoenvironmental Engineering,2013,139(11):1875-1893
10 Tan Y,Wang D L.Characteristics of a large-scale deep foundation pit excavated by the centralisland technique in Shanghai soft clay.Ⅱ:top-down construction of the peripheral rectangular pit[J].Journal of Geotechnical and Geoenvironmental Engineering,2013,139(11):1894-1910
11 Tan Y,Wei B,Diao Y,et al.Spatial corner effects of jong and narrow multi-propped deep excavations in Shanghai soft clay[J].Journal of Performance of Constructed Facilities,2014,28(4):04014015
12胡之锋,陈健,周兴涛,等.钢支撑滞后架设对深基坑围护结构及地表沉降的影响[J].科学技术与工程,2019,19(1):213-220Hu Zhifeng,Chen Jian,Zhou Xingtao,et al.Influence of delaying installation of steel bracing on retaining wall and ground settlement of deep excavation[J].Science Technology and Engineering,2019,19(1):213-220
13刘建航.软土基坑工程中时空效应理论与实践[J].岩石力学与工程学报,1998,18(增刊1):763-770Liu Jianhang.Time-space-effect theory and practice for excavations in soft clays[J].Chinese Journal of Rock Mechanics and Engineering,1999,18(S1):763-770
14刘兴旺,施祖元,益德清,等.软土地区基坑开挖变形性状研究[J].岩土工程学报,1999,21(4):456-460Liu Xingwang,Shi Zuyuan,Yi Deqing,et al.Deformation characteristics analysis of braced excavationon soft clay[J].Chinese Journal of Geotechnical Engineering,1999,21(4):456-460
15陶连金,代希彤,边金.盖挖逆作法地铁车站结构体系内力及变形研究进展[J].科学技术与工程,2018,18(24):188-194Tao Lianjin,Dai Xitong,Bian Jin.Advances in research on the internal force and deformation of the subway stations'structural system with cover and cut-top down method[J].Science Technology and Engineering,2018,18(24):188-194
16上海市市政工程管理局.上海地铁基坑工程施工规程:SZ-08-2000[S].上海:人民交通出版社,2000Shanghai Municipal Engineering Administration.Construction specification for foundation pitof Shanghai metro:SZ-08-2000[S].Shanghai:People’s Communications Publishing House,2000