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北京不同区域明挖基坑地表沉降变形特征研究

张建全 张克利 程贵方

张建全, 张克利, 程贵方. 北京不同区域明挖基坑地表沉降变形特征研究[J]. 水文地质工程地质, 2021, 48(6): 131-139. doi: 10.16030/j.cnki.issn.1000-3665.202101018
引用本文: 张建全, 张克利, 程贵方. 北京不同区域明挖基坑地表沉降变形特征研究[J]. 水文地质工程地质, 2021, 48(6): 131-139. doi: 10.16030/j.cnki.issn.1000-3665.202101018
ZHANG Jianquan, ZHANG Keli, CHENG Guifang. Characteristics of surface settlement and deformation of open cut foundation pit in different areas of Beijing[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 131-139. doi: 10.16030/j.cnki.issn.1000-3665.202101018
Citation: ZHANG Jianquan, ZHANG Keli, CHENG Guifang. Characteristics of surface settlement and deformation of open cut foundation pit in different areas of Beijing[J]. Hydrogeology & Engineering Geology, 2021, 48(6): 131-139. doi: 10.16030/j.cnki.issn.1000-3665.202101018

北京不同区域明挖基坑地表沉降变形特征研究

doi: 10.16030/j.cnki.issn.1000-3665.202101018
基金项目: 2017年北京市地方标准制修订计划项目(建设工程第三方监测技术规程子课题,20171020)
详细信息
    作者简介:

    张建全(1963-),男,博士,总工程师,从事轨道交通工程、地下工程设计与研究工作。E-mail:13701061228@163.com

    通讯作者:

    张克利(1992-),男,硕士,工程师,主要从事岩土工程、地下工程研究工作。E-mail:1010295820@qq.com

  • 中图分类号: TU433

Characteristics of surface settlement and deformation of open cut foundation pit in different areas of Beijing

  • 摘要: 基于近年北京地区不同区域大量明挖基坑工程地表沉降实测数据,利用理论计算与回归分析方法,对预测地表沉降的典型曲线“四点折线法”及其模型参数(斜率K及截距b)进行了反演分析,获得了不同区域地质条件下明挖基坑地表沉降预测经验参数;通过对沉降数据及经验参数的统计分析,总结了地表沉降区域变化规律,明确了参数的取值范围,并利用实测数据验证了经验参数的预测精度。结果显示:北京西部区域最大沉降点距离围护结构的水平距离相对中、东部偏大,约为基坑深度的30%,中、东部区域相对较小,均约为基坑深度的26%;地表沉降曲线形态随着区域地质条件不同而不同,四点折线图第一段直线AB的斜率K的绝对值由西向东依次增大,表明东部粉细砂地层比西部砂卵石地层沉降坡度更加明显,第二段直线BC的斜率K的绝对值东部区域比西部区域反而较小,这表明东部区域的沉降影响范围较大;参数bAB绝对值均值由西向东依次增大,表明东部粉质黏土、细沙层相对西部砂卵石地层的桩侧土体沉降值更大,约为最大沉降值的31%,中部区域为21%,西部区域仅为16%。该研究成果将为本地区明挖基坑工程地表变形预测和安全风险控制提供重要的参考依据。
  • 图  1  地表沉降曲线基本形态

    Figure  1.  Basic form of surface subsidence curve

    图  2  围护结构外侧地表沉降四点折线图

    Figure  2.  Four point broken line of ground settlement on the outside of enclosure structure

    图  3  北京地区典型地质区域简要划分剖面

    Figure  3.  Brief cross section of typical geological areas in Beijing

    图  4  北京不同区域典型地质剖面图

    Figure  4.  Typical geological cross sections in different regions of Beijing

    图  5  北京不同区域不同基坑工程地表沉降曲线

    Figure  5.  Surface settlement curves of different foundation pits in different regions of Beijing

    图  6  北京地区不同区域基坑地表沉降四点折线图

    Figure  6.  Four point polygon map of ground settlement in different regions of Beijing

    图  7  北京不同区域基坑地表沉降预测与实测曲线对比

    Figure  7.  Comparison of ground settlement prediction and the measured curves in different regions of Beijing

    表  1  北京不同区域各基坑地层物理力学指标

    Table  1.   Physical and mechanical indexes of foundation pit in different regions of Beijing

    区域岩层天然密度/kPa黏聚力/kPa内摩擦角/(°)压缩模量/MPa泊松比
    西部区域填土1.54~1.9219.53~19.8113.44~15.035.81~7.130.28~0.33
    砂卵层2.09~2.2141.39~46.3150.02~60.270.16~0.21
    中粗砂2.04~2.1233.09~40.9128.84~34.370.22~0.23
    粉质黏土1.89~2.0125.60~46.7216.23~23.546.84~10.460.29~0.35
    中部区域填土1.59~1.8919.66~19.7413.89~15.345.67~7.450.24~0.31
    中粗砂2.07~2.1032.87~40.2428.97~34.220.22~0.23
    粉质黏土1.93~2.0227.60~52.7216.23~23.546.84~9.460.29~0.35
    细中砂2.03~2.0632.20~36.8427.63~35.420.23~0.24
    东部区域填土1.59~1.8919.66~19.7413.89~15.345.67~7.450.24~0.31
    粉细砂1.92~2.1825.32~31.0818.36~28.910.23~0.25
    粉质黏土1.57~1.9429.64~56.3717.37~28.597.41~10.240.28~0.33
    黏土1.97~2.0838.25~56.4816.38~20.498.67~13.410.26~0.32
      注:各基坑力学指标存在一些差异,表内统计数据为各基坑岩土体的力学指标数据范围。
    下载: 导出CSV

    表  2  西部基坑地表沉降实测数据计算表

    Table  2.   Calculations of the measured data of ground settlement of foundation pit in the west

    测点
    编号
    坐标
    类别
    断面1断面2断面3断面4断面5断面6断面7断面8断面9断面10
    1#d1/H0.000.000.000.000.000.000.000.000.000.00
    δ1/δmax0.140.270.210.170.060.110.100.200.170.17
    2#d2/H0.400.500.330.330.330.250.330.360.280.31
    δ2/δmax1.001.001.001.001.001.001.001.001.001.00
    3#d3/H1.001.000.560.941.000.501.000.710.561.00
    δ3/δmax0.420.450.440.340.280.260.290.230.260.43
    4#d4/H2.001.501.501.251.331.001.331.431.111.25
    δ4/δmax0.100.170.170.130.020.050.080.120.120.17
    5#d5/H3.003.001.671.882.001.67
    δ5/δmax0.010.000.030.020.010.01
      注:各基坑力学指标存在一些差异,表内统计数据为各基坑岩土体的力学指标数据范围。
    下载: 导出CSV

    表  3  北京不同区域基坑四点折线图斜率K与截距b统计表

    Table  3.   Statistics of slope K and intercept b of four point broken line diagram of foundation pit in different areass of Beijing

    区域斜率Kij断面1断面2断面3断面4断面5断面6断面7断面8断面9断面10
    西部
    区域
    KAB−2.14−1.46−2.36−2.49−2.81−3.58−2.69−2.25−3.00−2.65
    KBC0.560.830.710.950.981.270.920.821.050.89
    KCD0.090.071.120.170.981.270.110.19
    bAB−0.14−0.27−0.21−0.17−0.06−0.11−0.10−0.20−0.17−0.17
    bBC−1.23−1.41−1.24−1.32−1.33−1.32−1.31−1.29−1.29−1.28
    bCD−0.28−0.21−1.89−0.35−1.33−1.32−0.23−0.34
    中部
    区域
    KAB−4.19−2.60−3.04−3.07−2.86−2.72
    KBC1.400.710.450.980.520.89
    KCD0.010.120.120.020.05
    bAB−0.29−0.22−0.16−0.15−0.20−0.25
    bBC−1.30−0.93−1.12−1.22−1.17−1.75
    bCD−0.09−0.28−0.27−0.17−0.17
    东部
    区域
    KAB−3.48−2.74−3.39−3.76−3.47−3.16−2.86−2.93
    KBC1.230.830.580.981.271.070.860.89
    KCD0.340.130.910.200.160.18
    bAB−0.20−0.34−0.37−0.27−0.32−0.38−0.28−0.29
    bBC−1.62−1.15−1.15−1.28−1.42−1.30−1.29−1.21
    bCD−0.51−0.27−1.73−0.35−0.28−0.39
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-01-10
  • 修回日期:  2021-03-30
  • 网络出版日期:  2021-11-15
  • 刊出日期:  2021-11-15

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