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基于响应面试验设计的深基坑降水开挖地表沉降特性

程昊 陈辉 张抒 贾瀚英

程昊, 陈辉, 张抒, 贾瀚英. 基于响应面试验设计的深基坑降水开挖地表沉降特性[J]. 地质科技通报, 2024, 43(5): 181-196. doi: 10.19509/j.cnki.dzkq.tb20230294
引用本文: 程昊, 陈辉, 张抒, 贾瀚英. 基于响应面试验设计的深基坑降水开挖地表沉降特性[J]. 地质科技通报, 2024, 43(5): 181-196. doi: 10.19509/j.cnki.dzkq.tb20230294
CHENG Hao, CHEN Hui, ZHANG Shu, JIA Hanying. Investigations into ground surface settlement characteristics of excavation under dewatering and excavating conditions using the response surface experimental design method[J]. Bulletin of Geological Science and Technology, 2024, 43(5): 181-196. doi: 10.19509/j.cnki.dzkq.tb20230294
Citation: CHENG Hao, CHEN Hui, ZHANG Shu, JIA Hanying. Investigations into ground surface settlement characteristics of excavation under dewatering and excavating conditions using the response surface experimental design method[J]. Bulletin of Geological Science and Technology, 2024, 43(5): 181-196. doi: 10.19509/j.cnki.dzkq.tb20230294

基于响应面试验设计的深基坑降水开挖地表沉降特性

doi: 10.19509/j.cnki.dzkq.tb20230294
基金项目: 

国家自然科学基金项目 U2340230

湖北省自然科学基金项目 2023AFB933

中交第二航务工程勘察设计院有限公司重点科研课题 RP2024040998

湖北省重点研发项目 2023BCB117

详细信息
    作者简介:

    程昊, E-mail: 875549311@qq.com

    通讯作者:

    张抒, E-mail: szhang@cug.edu.cn

  • 中图分类号: TU753

Investigations into ground surface settlement characteristics of excavation under dewatering and excavating conditions using the response surface experimental design method

More Information
  • 摘要:

    受降水与开挖作用的共同影响, 基坑周边土体会持续发生地表沉降变形, 对基坑稳定以及周边环境都产生显著影响。为厘清基坑工程降水开挖过程中地表沉降的影响工况因素, 并在此基础上建立经验模型, 选取杭州地区典型江河阶地二元结构地层组合的深基坑为案例, 开展了系统研究。首先, 基于降水开挖作用下的土体变形机理, 结合变形实测数据, 提出了一种结合摩尔库伦(MC)与修正剑桥(MMC)本构关系开展基坑降水开挖沉降过程的数值分析方法。进一步采用响应面试验设计方法(RSM), 考虑多种工况因素及其交互作用, 建立了研究区内二元地质结构条件下基坑降水开挖地表沉降的经验模型, 并分析了地表沉降分区特征。结果表明, 地下水位降深(Hd)对地表沉降影响最为显著, 其次为地下连续墙深度(Hw)与开挖宽度(B), 其中BHd交互作用也较为显著。据此建立的回归模型可以较为准确地预测地表最大沉降量。本研究不仅为类似地层条件的基坑工程提供了经验模型, 也为基坑设计、施工和监测提供了实用框架, 对有效控制基坑及周边环境的沉降变形具有重要价值。

     

  • 图 1  杭州某基坑典型地层结构、支护结构及监测工程布置图

    a.典型地层结构及支护结构示意图;b.工程场地卫星视图;c.地表沉降监测工程布置图;DBC25-70为监测点编号

    Figure 1.  Typical stratigraphic structure, braced structure and monitoring layout of an excavation

    图 2  采用MC-MCC联合模型开展基坑降水开挖沉降数值分析示意图

    Hw为地下连续墙深度,m;He为开挖深度,m; DMC为MC本构关系作用范围,m;φ为地下连续墙所穿越土层的平均内摩擦角, (°)

    Figure 2.  Schematic diagram of numerical analysis of excavation settlement using the hybrid MC-MCC constitutive model

    图 3  采用MC-MCC联合模型开展基坑降水开挖沉降数值分析示意图(单位: m)

    Figure 3.  Schematic diagram of the finite element model for excavation using the hybrid MC-MCC constitutive model

    图 4  数值分析得到的沉降曲线与实测数据对比

    Figure 4.  Comparison of settlement curves obtained from numerical analysis with measured data

    图 5  基坑降水渗流场流速云图

    Figure 5.  Flow velocity contour diagram of the seepage field of the excavation

    图 6  MC-MCC联合本构关系数值计算得到的竖向位移云图

    Figure 6.  Vertical displacement contour diagram obtained by numerical calculation of the hybrid MC-MCC constitutive model

    图 7  RSM模型参数贡献值(代号含义同表 3)

    Figure 7.  RSM model parameter contribution values

    图 8  Hm预测值与模拟值

    Figure 8.  Comparison of the predicted and measured Hm values

    图 9  RSM模型充分性检验(a)和等方差检验(b)

    Figure 9.  Adequacy test(a) and equal variance test(b) of RSM model

    图 10  B×HwHm影响的3D视图(a)和2D视图(b) (MN为曲线;Kmn为其切线)

    b图中数字为a图Z轴的Hm值, m;下同

    Figure 10.  Interaction effect of B×Hw on Hm(3D view(a); 2D view(b))

    图 11  B×HdHm影响的3D视图(a)和2D视图(b) (符号含义同图 10)

    Figure 11.  Interaction effect of B×Hd on Hm: 3D view(a); 2D view(b)

    图 12  Hw×HdHm影响的3D视图(a)和2D视图(b) (符号含义同图 10)

    Figure 12.  Interaction effect of Hw×Hd on Hm: 3D view(a); (b) 2D view(b)

    图 13  基坑临近地表沉降影响性分区

    Figure 13.  Influence zones of excavation surface settlement

    图 14  不同连续墙深度下采用MC-MCC联合本构关系与MCC本构关系计算得到沉降曲线随降水深度的变化

    a. 连续墙深度29 m; b. 连续墙深度35 m; c. 连续墙深度41 m; d. 地表最大沉降统计

    Figure 14.  Variation of settlement curves with precipitation depth obtained by using the hybrid MC-MCC constitutive relationship and MCC constitutive relationship under different diaphragm depths

    表  1  基坑各土层物理力学参数

    Table  1.   Physical and mechanical parameters of each soil layer of the excavation

    土层 ρ/(kg·m-3) λ κ M ν K/(m·s-1) e E/MPa φ/(°) c/kPa
    粉土 1 550 0.035 1 0.003 51 0.857 0.30 1.82×10-6 0.795 20 28 16
    淤泥质粉质黏土 1 230 0.179 0 0.015 10 0.880 0.35 1.08×10-8 1.218 40 16 18
    粉质黏土 1 600 0.028 3 0.002 83 0.943 0.28 1.00×10-8 0.731 20 24 21
    圆砾 1 800 0.26 5.62×10-5 0.650 150
    注:ρ为密度;λ为压缩指数; κ为回弹指数;M为临界压力比;ν为泊松比;K为渗透系数;e为孔隙比; E为弹性模量;φ为内摩擦角;c为黏聚力
    下载: 导出CSV

    表  2  CCD试验设计影响因素水平

    Table  2.   Factors and levels of CCD experimental design

    水平 开挖宽度B/m 连续墙深度Hw/m 水位降深Hd/m
    -a 13.6 24.9 0.0
    -1 17.0 29.0 1.4
    0 22.0 35.0 3.5
    1 27.0 41.0 5.6
    a 30.4 45.1 7.0
    注:本文试验设计中a=1.681 79
    下载: 导出CSV

    表  3  基坑降水开挖CCD试验设计与沉降指标响应

    Table  3.   Working conditions of CCD experimental design and corresponding obtained settlement indices

    试验组编号 开挖宽度B/m 连续墙深度Hw/m 水位降深Hd/m 最大沉降量Hm/m 最大沉降点位置Dm/m
    1 17.0 29.0 5.6 -0.043 14.583
    2 22.0 35.0 3.5 -0.031 13.791
    3 22.0 25.0 3.5 -0.035 13.791
    4 27.0 29.0 5.6 -0.046 14.165
    5 17.0 29.0 1.4 -0.021 12.631
    6 17.0 41.0 1.4 -0.020 12.631
    7 27.0 41.0 1.4 -0.024 12.413
    8 22.0 35.0 7.0 -0.047 13.791
    9 22.0 35.0 3.5 -0.031 13.791
    10 17.0 41.0 5.6 -0.035 14.583
    11 22.0 35.0 0.0 -0.017 11.959
    12 22.0 35.0 3.5 -0.031 13.791
    13 13.6 35.0 3.5 -0.027 12.698
    14 27.0 41.0 5.6 -0.039 12.413
    15 22.0 35.0 3.5 -0.031 13.791
    16 27.0 29.0 1.4 -0.025 12.413
    17 22.0 45.0 3.5 -0.028 11.959
    18 22.0 35.0 3.5 -0.031 13.791
    19 30.4 35.0 3.5 -0.027 14.298
    20 22.0 35.0 3.5 -0.031 13.791
    下载: 导出CSV

    表  4  Hm响应面回归模型方差分析

    Table  4.   ANOVA of Hm response surface regression model

    方差来源 平方和 自由度 均方 F P 显著性
    模型 1.181×10-3 9 1.312×10-4 72.49 < 0.000 1 显著
    B 1.574×10-5 1 1.574×10-5 8.70 0.014 6 显著
    Hw 5.512×10-5 1 5.512×10-5 30.46 0.000 3 显著
    Hd 1.064×10-3 1 1.064×10-3 587.79 < 0.000 1 显著
    B-Hw 2.656×10-7 1 2.656×10-7 0.15 0.709 7 不显著
    B-Hd 1.574×10-7 1 1.574×10-7 0.087 0.774 1 不显著
    Hw-Hd 2.009×10-5 1 2.009×10-5 11.10 0.007 6 显著
    B2 1.656×10-5 1 1.656×10-5 9.15 0.012 8 显著
    Hw2 3.317×10-6 1 3.317×10-6 1.83 0.205 6 不显著
    Hd2 3.148×10-6 1 3.148×10-6 1.74 0.216 6 不显著
    残差 1.810×10-5 10 1.810×10-6
    失拟项 1.810×10-5 5 3.620×10-6
    纯误差 0.000 5 0.000
    总和 1.199×10-3 19
    拟合系数R2 0.984 9 预测R2 0.885 4
    调整R2 0.971 3 标准差 0.001 3
    下载: 导出CSV

    表  5  Dm响应面回归模型方差分析

    Table  5.   ANOVA of Dm response surface regression model

    方差来源 平方和 自由度 均方 F P 显著性
    模型 62.34 9 6.93 2.48 0.087 1 不显著
    B 21.58 1 21.58 7.71 0.019 5 显著
    Hw 1.71 1 1.71 0.61 0.452 5 不显著
    Hd 5.59 1 5.59 2.00 0.187 9 不显著
    B-Hw 0.38 1 0.38 0.14 0.718 9 不显著
    B-Hd 0.58 1 0.58 0.21 0.658 8 不显著
    Hw-Hd 0.38 1 0.38 0.14 0.718 9 不显著
    B2 30.65 1 30.65 10.96 0.007 9 显著
    Hw2 0.11 1 0.11 0.041 0.843 8 不显著
    Hd2 0.11 1 0.11 0.041 0.843 8 不显著
    残差 27.98 10 2.80
    失拟项 27.98 5 5.60
    纯误差 0.00 5 0.00
    总和 90.32 19
    拟合系数R2 0.650 7 预测R2 -1.504 9
    调整R2 0.336 3 标准差 1.78
    下载: 导出CSV

    表  6  调整后Hm响应面模型方差分析

    Table  6.   ANOVA of adjusted Hm response surface regression model

    方差来源 平方和 自由度 均方 F P 显著性
    模型 1.174×10-3 5 2.349×10-4 134.76 < 0.000 1 显著
    B 1.574×10-5 1 1.574×10-5 9.03 0.009 5 显著
    Hw 5.512×10-5 1 5.512×10-5 31.63 < 0.000 1 显著
    Hd 1.064×10-3 1 1.064×10-3 610.32 < 0.000 1 显著
    Hw-Hd 2.009×10-5 1 2.009×10-5 11.53 0.004 4 显著
    B2 1.966×10-5 1 1.966×10-5 11.28 0.004 7 显著
    残差 2.440×10-5 14 1.743×10-5
    失拟项 2.440×10-5 9 2.711×10-6
    纯误差 0.000 5 0.000
    总和 1.199×10-3 19
    拟合系数R2 0.979 6 预测R2 0.925 1
    调整R2 0.972 4 标准差 0.001 3
    下载: 导出CSV

    表  7  基坑地表沉降影响性分区

    Table  7.   Influence zones of excavation surface settlement

    基坑工程影响区 范围
    主要影响区(Ⅰ) 基坑周边0.7HeHe·tan(45°-φ/2)范围
    次要影响区(Ⅱ) 基坑周边0.7He~(2.0~3.0)HeHe·tan(45°-φ/2)~(2.0~3.0)He范围
    可能影响区(Ⅲ) 基坑周边(2.0~3.0)He
    注:He为基坑设计深度, m;φ为岩土体内摩擦角, (°);基坑开挖范围内存在基岩时,He可为覆盖土层和基岩强风化层厚度之和;工程影响分区的划分界线取表中0.7HeHe·tan(45°-φ/2)的较大值
    下载: 导出CSV
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出版历程
  • 收稿日期:  2023-05-24
  • 录用日期:  2023-07-05
  • 修回日期:  2023-06-30

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