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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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

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	ZHANG Zhen1
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	YE Jianzhong3
	JIA Mincai1
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Cite this article:

ZHANG Zhen1,2,YE Jianzhong3, et al. Field data analysis of small width-depth ratio foundation pits deformation in Shanghai soft soils[J]. , 2017, 36(S1): 3627-3636.

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

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