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黄土深基坑潜水区降水诱发地面沉降的简化算法

胡长明 林成

胡长明, 林成. 2021: 黄土深基坑潜水区降水诱发地面沉降的简化算法. 中国地质灾害与防治学报, 32(3): 76-83, 139. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-10
引用本文: 胡长明, 林成. 2021: 黄土深基坑潜水区降水诱发地面沉降的简化算法. 中国地质灾害与防治学报, 32(3): 76-83, 139. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-10
Changming HU, Cheng LIN. 2021: Simplified calculation of settlement due to dewatering of phreatic aquifer in loess area. The Chinese Journal of Geological Hazard and Control, 32(3): 76-83, 139. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-10
Citation: Changming HU, Cheng LIN. 2021: Simplified calculation of settlement due to dewatering of phreatic aquifer in loess area. The Chinese Journal of Geological Hazard and Control, 32(3): 76-83, 139. doi: 10.16031/j.cnki.issn.1003-8035.2021.03-10

黄土深基坑潜水区降水诱发地面沉降的简化算法

doi: 10.16031/j.cnki.issn.1003-8035.2021.03-10
基金项目: 国家自然科学基金项目(51408463);陕西省教育厅专项科研计划项目(17JK0424)
详细信息
    作者简介:

    胡长明(1963-),男,博士,教授,主要从事土木工程建造与管理方面的研究。E-mail:hu.tm@163.com

  • 中图分类号: P642.26

Simplified calculation of settlement due to dewatering of phreatic aquifer in loess area

  • 摘要: 针对黄土地区深基坑降水导致地层不均匀沉降,危及坑周建筑物的问题,论文基于基坑降水诱发地面沉降机理分析,以分层总和法和剪切位移法为基础,推导出降水引起地面沉降的简化计算公式。在忽略群井效应和土层侧向变形的前提下,依据Dupuit公式得出基坑降水曲线方程,将坑周土体以降水曲线为界分为疏干区和饱和区。引入修正系数,对黄土地区不同性质土层因孔隙水压力减小产生的有效应力增量修正,同时考虑桩-土界面侧摩阻力对土体的约束作用,分别计算距井轴不同距离处的沉降量,叠加后得出最终的沉降值。对比数值模拟计算结果及工程实例监测值,分析表明:在桩-土交界处,侧摩阻力对土体竖向沉降的约束作用最明显;在1.5倍降水深度范围内的沉降计算值精度远高于规范算法,能够较好的预测降水期间黄土地区坑周不同距离处的地面沉降量。
  • 图  1  单井降水示意图

    Figure  1.  Single well dewatering diagram

    图  2  地下水位下降时桩-土剪切应力传递性状模式

    Figure  2.  Pile-soil shear stress transfer behavior and pattern while groundwater level drops

    图  3  围护结构侧摩阻力传递示意图

    Figure  3.  Schematic diagram of lateral friction transfer of envelope

    图  4  降水井、观测井及各监测点平面布置图

    Figure  4.  Arrangement of dewatering well,observation well and monitoring points

    图  5  地下水位累计变化图

    Figure  5.  Cumulative change of groundwater level

    图  6  基坑周边地面沉降变化曲线

    Figure  6.  Ground settlement curve around foundation pit

    图  7  围护结构对地面沉降的约束量

    Figure  7.  Constraint value of pit support structure to ground surface settlement

    图  8  网格划分后的基坑模型

    Figure  8.  The geometric model of the pit after meshing

    图  9  降水后孔压云图

    Figure  9.  Pore pressure after dewatering

    图  10  基坑降水向量

    Figure  10.  Dewatering vector of foundation pit

    图  11  地表沉降曲线

    Figure  11.  The settlement curveof ground surface

    图  12  不同距离地面沉降计算值与监测值对比

    Figure  12.  Comparison of the settlement values from the different distance after dewatering using different methods

    表  1  地层物理力学指标

    Table  1.   Physical and mechanical parameters of soil formation

    岩土名称层厚/m弹性模量/
    (kN·m−2
    泊松比容重/
    (kN·m−3
    黏聚力/
    kPa
    内摩擦角/
    (°)
    杂填土280000.3716.52516.0
    素填土3213500.3515.13317.3
    新黄土5161000.2815.24519.0
    饱和软黄土2164500.3517.03517.0
    古土壤5196000.3018.64518.5
    老黄土10196000.3319.24517.5
    粉质黏土13206500.2919.44521.0
    下载: 导出CSV

    表  2  距降水井不同距离地面沉降计算值

    Table  2.   The settlement calculation values around foundation pit from different distance

    计算方法最终地面沉降值/mm
    距井
    2 m
    距井
    4 m
    距井
    10 m
    距井
    16 m
    距井
    22 m
    距井
    28 m
    规范算法64.254.241.232.726.221.8
    对$ \Delta {\sigma }' $进行修正24.820.616.012.710.28.5
    考虑围护结构约束21.818.914.912.19.88.2
    下载: 导出CSV
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出版历程
  • 收稿日期:  2020-06-26
  • 修回日期:  2020-08-03
  • 刊出日期:  2021-06-25

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