上海软土地区小宽深比基坑变形实测研究

doi:10.13722/j.cnki.jrme.2016.0004

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摘要

为了探究小宽深比基坑的变形特性，结合上海虹桥地区23个小宽深比基坑实测资料，在与普通基坑变形对比分析的基础上，对不同形状、不同支护形式的小宽深比基坑变形规律进行研究。结果表明：(1) 小宽深比基坑围护结构最大侧移值()的平均值为0.16%H_e(H_e为基坑开挖深度)，明显小于普通基坑的；(2) 小宽深比基坑围护结构最大侧移点埋深(H_d)范围为(H_e－6，H_e＋6)；(3) 小宽深比基坑墙后最大地表沉降值()的平均值为0.15%H_e，小于普通基坑的；(4) 小宽深比基坑中井形基坑的和均小于狭长形基坑，表现出较强的变形控制能力；(5) 小宽深比基坑的和与支护形式有关，钢板桩、SMW工法桩、钻孔灌注桩对应的变形依次减小；(6) 小宽深比基坑墙后地表沉降呈梯形分布，其沉降影响范围小于普通基坑；小宽深比基坑中狭长形基坑墙后地表沉降影响范围大于井形基坑；(7) 小宽深比基坑的平均值为0.96，主要与土层性质有关。

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关键词 ：基坑工程, 小宽深比基坑, 变形, 空间效应, 墙后地表沉降, 围护结构侧移

Abstract：

To investigate the deformation characteristics of small width-depth ratio foundation pits，23 case histories of wall and ground movements in Shanghai soft soils were collected and analyzed. Based on the field data，several major findings were obtained：(1) The maximum horizontal wall displacement() of small width-depth ratio pits is smaller than that of regular pits，with an average value of (excavation depth). (2) The location of maximum lateral wall deflection(H_d) ranges from －6 to +6. (3) Maximum ground settlement() of small width-depth ratio foundation pits is smaller than that of regular pits，with an average value of . (4) Small width-depth ratio pits have stronger anti-deformation abilities than regular pits. (5) andof small width-depth ratio foundation pits supported by sheet pile wall，soil mixing wall and bored pile decrease in turn. (6) The envelope line of ground settlements of small width-depth ratio foundation pits is ladder-shaped and it also shows that influence scope of ground settlements adjacent to small with-depth ratio pits is smaller than that of regular pits. (7) The average value of is 0.96，which is mainly controlled by soil conditions.

Key words： pit foundation small width-depth ratio pit deformation spatial effect group surface settlement wall deflection

引用本文:

张震1，2，叶建忠3，贾敏才1，2. 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(S1): 3627-3636.
ZHANG Zhen1，2，YE Jianzhong3，JIA Mincai1，2. Field data analysis of small width-depth ratio foundation pits deformation in Shanghai soft soils. , 2017, 36(S1): 3627-3636.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0004 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS1/3627

[1] OU C Y，SHIAU B Y. Analysis of the corner effect on excavation behaviors[J]. Canadian Geotechnical Journal，1998，35(3)：532–540.

[2] FINNO R J，HARAHAP I S. Finite element analyses of HDR–4 excavation[J]. Journal of Geotechnical Engineering，1991，117(10)：1 590–1 609.

[3] WHITTLE A J，HASHASH Y M A，WHITMAN R V. Analysis of deep excavation in Boston[J]. Journal of Geotechnical Engineering，1993，119(1)：69–90.

[4] 王广国，杜明芳，侯学渊. 深基坑的大变形分析[J]. 岩石力学与工程学报，2000，19(4)：509–512.(WANG Guangguo，DU Mingfang，HOU Xueyuan. Large deformation analysis for braced excavation[J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(4)：509–512.(in Chinese))

[5] HASHASH Y M H，WHITTLE A J. Mechanisms of load transfer and arching for braced excavations in clay[J]. Journal of Geotechnical and Geoenvironmental Engineering，2002，128(3)：187–197.

[6] FINNO R J，ROBOSKI J F. Three-dimensional responses of a tied-back excavation through clay[J]. Journal of Geotechnical and Geoenvironmental Engineering，2005，131(3)：273–282.

[7] SON M，CORDING E J. Estimation of building damage due to excavation-induced ground movements[J]. Journal of Geotechnical and Geoenvironmental Engineering，2005，131(2)：162–177.

[8] HASHASH Y M A，MARULANDA C，GHABOUSSI J，et al. Novel approach to integration of numerical modeling and field observations for deep excavations[J]. Journal of Geotechnical Engineering，2006，132(8)：1 019–1 031.

[9] OSOULI A，HASHASH Y M A，SONG H. Interplay between field measurements and soil behavior for capturing supported excavation response[J]. Journal of Geotechnical Engineering，2010，136(1)：69–84.

[10] PECK R B. Deep excavations and tunneling in soft ground[C]// Proceedings of 7th International Conference on Soil Mechanics and Foundation Engineering. Mexico：[s.n.]，1969：225–290.

[11] MANA A I，CLOUGH G W. Prediction of movements for braced cuts in clay[J]. Journal of the Geotechnical Engineering Division，1981，107(6)：759–777.

[12] HSIEH P G，OU C Y. Shape of ground surface settlement profiles caused by excavation[J]. Canadian Geotechnical Journal，1998，35(6)：1 004–1 017.

[13] LONG M. Database for retaining wall and ground movements due to deep excavations[J]. Journal of Geotechnical and Geoenvironmental Engineering，2001，127(3)：203–224.

[14] ROBOSKI J，FINNO R J. Distribution of ground movements parallel to deep excavations in clay[J]. Canadian Geotechnical Journal，2006，43(1)：43–58.

[15] KUNG G T C，JUANG C H，HSIAO E C L，et al. Simplified model for wall deflection and ground-surface settlement caused by braced excavation in clays[J]. Journal of Geotechnical and Geoenvironmental Engineering，2007，133(6)：731–747.

[16] 蒋冲，周科平，胡毅夫. 深圳平安金融中心基坑围护结构变形监测分析[J]. 岩石力学与工程学报，2012，31(增1)：3 483–3 489. (JIANG Chong，ZHOU Keping，HU Yifu. Deformation monitoring and analysis of retaining structure in foundation pit of Ping¢an Financial Center in Shenzhen[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(Supp.1)：3 483–3 489.(in Chinese))

[17] 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(4)：985–994.

[18] TAN Y，WANG D L. Characteristics of a large-scale deep foundation pit excavated by the central-island technique in Shanghai soft clay. I：Bottom-up construction of the central cylindrical shaft[J]. Journal of Geotechnical and Geoenvironmental Engineering，2013，139(11)：1 875–1 893.

[19] TAN Y，WANG D L. Characteristics of a large-scale deep foundation pit excavated by the central-island technique in Shanghai soft clay. II：Top-down construction of the peripheral rectangular pit[J]. Journal of Geotechnical and Geoenvironmental Engineering，2013，139(11)：1 894–1 910.

[20] 刘念武，龚晓南，俞峰，等. 内支撑结构基坑的空间效应及影响因素分析[J]. 岩土力学，2014，35(8)：2 293–2 306.(LIU Nianwu，GONG Xiaonan，YU Feng，et al. Analysis of spatial effects in strutted excavation and related influential factors[J]. Rock and Soil Mechanics，2014，35(8)：2 293–2 306.(in Chinese))

[21] 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)：1 659–1 666.(WANG Weidong，XU Zhonghua，WANG Jianhua. Statistical analysis of characteristics of ground surface settlement caused by deep excavations in Shanghai soft soils[J]. Chinese Journal of Geotechnical Engineering，2011，33(11)：1 659–1 666.(in Chinese))

[22] 王旭军. 上海中心大厦裙房深大基坑工程围护墙变形分析[J]. 岩石力学与工程学报，2012，31(2)：421–431.(WANG Xujun. Analysis of retaining wall deformation for deep and big foundation pits of podium in shanghai tower[J]. Chinese Journal of Rock Mechanics and Engineering，2012，31(2)：421–431.(in Chinese))

[23] 徐伟，夏乔网，徐鹏飞，等. 软土地基临江特大型相邻深基坑同期施工监测分析[J]. 岩石力学与工程学报，2013，32(增1)：2 676–2 683.(XU Wei，XIA Qiaowang，XU Pengfei，et al. Monitoring and analysis of synchronized excavation of extra large-scale adjacent riverside deep foundation pits in soft soil[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(Supp.1)：2 676–2 683.(in Chinese))

[24] 徐中华. 上海地区支护结构与主体地下结构相结合的深基坑变形性状研究[博士学位论文][D]. 上海：上海交通大学，2007.(XU Zhonghua. Deformation behavior of deep excavations supported by permanent structure in Shanghai soft deposit[Ph. D. Thesis][D]. Shanghai：Shanghai Jiaotong University，2007.(in Chinese))

[25] 丁勇春，王建华，徐中华，等. 上海软土地区地铁车站深基坑的变形特性[J]. 上海交通大学学报，2008，42(11)：1 871–1 875.(DING Yongchun，WANG Jianhua，XU Zhonghua，et al. Deformation characteristics of deep excavations for metro stations in shanghai soft soil deposits[J]. Journal of Shanghai Jiaotong University，2008，42(11)：1 871–1 875.(in Chinese))

[26] OU C Y，HSIEH P G，CHIOU D C. Characteristics of ground surface settlement during excavation[J]. Canadian Geotechnical Journal，1993，30(5)：758–767.

[27] TAN Y，WANG D L. Observed behaviors of a long and deep excavation constructed by cut-and-cover technique in shanghai soft clay[J]. Journal of Geotechnical and Geoenvironmental Engineering，2012，138(1)：69–88.

[28] 廖少明，魏仕锋，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)：458–469.(LIAO Shaoming，WEI Shifeng，TAN Yong，et al. Field performance of large-scale deep excavations in Suzhou[J]. Chinese Journal of Geotechnical Engineering，2015，37(3)：458–469.(in Chinese))

[29] LEUNG E H Y，NG C W W. Wall and ground movements associated with deep excavations supported ground by cast in-situ wall in mixed conditions[J]. Journal of Geotechnical and Geoenvironmental Engineering，2007，133(2)：129–143.