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苏州地区大尺度深基坑变形性状实测分析

廖少明, 魏仕锋, 谭勇, 柳骏茜

廖少明, 魏仕锋, 谭勇, 柳骏茜. 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): 458-469. DOI: 10.11779/CJGE201503009
引用本文: 廖少明, 魏仕锋, 谭勇, 柳骏茜. 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): 458-469. DOI: 10.11779/CJGE201503009
LIAO Shao-ming, WEI Shi-feng, TAN Yong, LIU Jun-xi. Field performance of large-scale deep excavations in Suzhou[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(3): 458-469. DOI: 10.11779/CJGE201503009
Citation: LIAO Shao-ming, WEI Shi-feng, TAN Yong, LIU Jun-xi. Field performance of large-scale deep excavations in Suzhou[J]. Chinese Journal of Geotechnical Engineering, 2015, 37(3): 458-469. DOI: 10.11779/CJGE201503009

苏州地区大尺度深基坑变形性状实测分析  English Version

基金项目: 国家自然科学基金项目(51378389); 上海市教育委员会科技创新重点项目(13zz027)
详细信息
    作者简介:

    廖少明(1966- ),男,湖北天门人,博士,教授,主要从事深基坑工程、盾构法隧道设计与施工的教学与科学研究工作。E-mail: liaosm@126.com。

  • 中图分类号: TU470.3

Field performance of large-scale deep excavations in Suzhou

  • 摘要: 以苏州广播电视总台现代传媒广场大尺度深基坑(面积为33500 m2)为工程背景,并收集了该地区11个采用钻孔灌注桩围护、顺作法施工的方形基坑(长宽比1.01~2.68)及至少23个采用地下连续墙围护的长条形地铁车站基坑的实测数据,全面地对比分析了苏州地区采用不同挡土结构、不同形状的大尺度深基坑的变形性状。研究结果表明:①方形基坑连续墙最大侧移值(δhm)平均值为0.08%He;地铁车站基坑连续墙δhm平均值为0.20%He;②方形基坑和地铁车站基坑的围护结构最大侧移点埋深(Hm)分别落于(He-10,He+5)和(He-7,He+8)范围内。采用混凝土支撑的基坑的Hm稍小于采用钢支撑的基坑的Hm;③同样采用地下连续墙围护的本工程方形基坑和长条形地铁车站基坑的墙后地表沉降最大值(δvm)的范围分别为(0.01%~0.09%)He和(0.04%~0.27%)He。地铁车站基坑墙后地表沉降影响范围约为4.5He,大于方形基坑墙后地表沉降的影响范围;④本工程方形基坑和地铁车站基坑δvm/δhm的范围分别为0.13~1.07和0.22~1.65;⑤方形基坑和地铁车站基坑的立柱隆起值(δcu)分别为(0.07%~0.26%)He和(0.10%~0.23%)He;⑥大尺度方形基坑和地铁车站基坑表观土压力包络线峰值分别为0.80γHe和0.87γHe,皆出现在开挖面以下(0.21~0.64)He处。采用Terzaghi和Peck及日本土木学会建议的土压力分布模式会显著低估该地区大尺度深基坑表观土压力峰值。
    Abstract: The performance of large-scale deep excavations in Suzhou, China is comprehensively examined based on a great deal of field data, concerining the excavation of Suzhou Modern Media Plaza (SMMP), 11 rectangular excavations (i.e., aspect ratio of length to width is around 1.01~2.68) constructed by the bottom-up method and supported by auger-cast-in-place piles, and at least 23 long and narrow metro station excavations supported by diaphragm walls in the same area reported in literatures. On the basis of the analysis of monitoring data, some major findings are obtained: (1) the average of the maximum lateral wall deflection, δhm, is 0.08%He for the rectangular excavations and 0.20%He for the metro excavations, where He is the excavation depth; (2) the depth Hm, where δhm occurs, falls between Hm = He-10 and Hm = He + 5 for the rectangular excavations and between Hm = He-7 and Hm = He + 8 for the metro excavations. Hm of the excavation propped by steel-reinforced concrete struts is a little smaller than that propped by steel pipe struts; (3) the maximum ground surface settlement, δvm, is around (0.01%~0.09%) He for the rectangular excavation of SMMP supported by diaphragm walls and around (0.04%~0.27%) He for the metro excavations. The ground settlement zone is about 4.5He behind the retaining walls for the metro stations which is larger than that of the rectangular excavations; (4) the ratio of δvm/δhm is around 0.13~1.07 for the excavation of SMMP and around 0.22~1.65 for the metro excavations; (5) the vertical column movement, δcu, is around (0.07%~0.26%) He for the rectangular excavations and around (0.10%~0.23%) He for the
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