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

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