上海软土地区小宽深比基坑变形实测研究

发布时间：2018-05-25 00:34

  本文选题：基坑工程 + 小宽深比基坑　； 参考：《岩石力学与工程学报》2017年S1期

【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(δ_(hm))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δ_(hm);(2)小宽深比基坑围护结构最大侧移点埋深(Hd)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(δ_(vm))的平均值为0.15%H_e,小于普通基坑的δ_(vm);(4)小宽深比基坑中井形基坑的δ_(hm)和δ_(vm)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δ_(hm)和δ_(vm)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δ_(vm)/δ_(hm)的平均值为0.96,主要与土层性质有关。
[Abstract]:In order to study the deformation characteristics of small width ratio foundation pit, combined with the measured data of 23 small width depth ratio foundation pit in Hongqiao area of Shanghai, on the basis of comparing and analyzing the deformation of common foundation pit, the different shapes of foundation pit are analyzed. The deformation law of foundation pit with small width to depth ratio of different support forms is studied. The results show that the average value of 0.16%H_e(H_e is the depth of foundation pit excavation, which is obviously smaller than that of ordinary foundation pit.) the maximum depth of lateral displacement of small width ratio is Hd) the range of He-6He-6He is 3) the average value of 0.16%H_e(H_e is the depth of foundation pit excavation, which is obviously smaller than that of ordinary foundation pit. The average value of the maximum surface settlement behind the depth ratio of foundation pit wall is 0.15He, which is smaller than that of the ordinary foundation pit (未 _ subgrade / VM ~ (4). The 未 _ (HM) and 未 _ (V _ (vm) of the well shaped foundation pit in the small width ratio are smaller than those of the narrow and long foundation pit. It is shown that the deformation control ability is strong. (5) the 未 substructure of the foundation pit with small width to depth ratio is related to the supporting form. The deformation corresponding to the steel plate pile and the bored pile is reduced in turn, and the deformation of the bored pile decreases in turn) the surface settlement of the foundation pit wall with the small width depth ratio presents a trapezoid distribution. The influence range of settlement is smaller than that of ordinary foundation pit, and the influence range of surface settlement behind the wall of long and narrow foundation pit with small aspect ratio is larger than that of well shaped foundation pit. The average value of 未 / 未 -span ratio is 0.96, which is mainly related to the properties of soil layer.
【作者单位】： 同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;浙江省交通规划设计研究院;
【基金】：浙江省交通运输厅科研计划项目(2014H06) 国家自然科学基金资助项目(40972214)~~
【分类号】：TU433
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本文编号：1931297