Processing math: 100%
  • 全国中文核心期刊
  • 中国科技核心期刊
  • 美国工程索引(EI)收录期刊
  • Scopus数据库收录期刊

考虑土与结构非线性接触特性的格形地下连续墙围护结构力学性状研究

郭盼盼, 龚晓南, 汪亦显

郭盼盼, 龚晓南, 汪亦显. 考虑土与结构非线性接触特性的格形地下连续墙围护结构力学性状研究[J]. 岩土工程学报, 2021, 43(7): 1201-1209. DOI: 10.11779/CJGE202107004
引用本文: 郭盼盼, 龚晓南, 汪亦显. 考虑土与结构非线性接触特性的格形地下连续墙围护结构力学性状研究[J]. 岩土工程学报, 2021, 43(7): 1201-1209. DOI: 10.11779/CJGE202107004
GUO Pan-pan, GONG Xiao-nan, WANG Yi-xian. Mechanical properties of cellular diaphragm wall in deep excavations considering nonlinear contact between wall and soil[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(7): 1201-1209. DOI: 10.11779/CJGE202107004
Citation: GUO Pan-pan, GONG Xiao-nan, WANG Yi-xian. Mechanical properties of cellular diaphragm wall in deep excavations considering nonlinear contact between wall and soil[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(7): 1201-1209. DOI: 10.11779/CJGE202107004

考虑土与结构非线性接触特性的格形地下连续墙围护结构力学性状研究  English Version

基金项目: 

国家自然科学基金项目 51778575

详细信息
    作者简介:

    郭盼盼(1992— ),男,博士研究生,主要从事岩土及地下工程方面的科研工作。E-mail:pp_guo@zju.edu.cn

    通讯作者:

    龚晓南, E-mail:gongxn@zju.edu.cn

  • 中图分类号: TU43

Mechanical properties of cellular diaphragm wall in deep excavations considering nonlinear contact between wall and soil

  • 摘要: 格形地下连续墙(简称“格形墙”)作为一种相对新型的无内支撑式基坑围护结构,其力学性状研究滞后于工程实践。基于将双曲线接触模型嵌入到商用软件中的二次开发,开展了砂土中格形墙围护结构的受力变形特性有限元分析。墙土间的接触采用线性和非线性两种本构模型,砂土的应力应变关系采用基于UMAT子程序自定义的亚塑性本构模型模拟。与已有离心模型试验结果的对比验证了本文有限元模型的有效性。研究结果表明,考虑墙土间非线性接触特性得到的格形墙围护结构的力学性状更为准确,其内在机理为双曲线接触模型能够反映出墙体底部与土体间接触面剪应力的非均匀分布特性以及关键节点的剪应力集中现象。作用于墙体上的土压力未达到极限状态,且具有明显的空间分布特性。墙体水平位移模式为悬臂式,墙顶竖向位移模式为前墙沉降后墙隆起的整体旋转式。前后墙两中隔墙中间位置的弯矩分布规律类似。研究成果对于格形墙围护结构的设计优化具有积极作用。
    Abstract: Cellular diaphragm (CD) wall, as a new kind of excavation supporting structure without internal bracing system, has not been well studied, despite its successful applications in many engineering practices. By incorporating the hyperbolic contact model into a commercial finite element software through FRIC subroutine, the finite element analysis of the mechanical properties of CD wall in sand is performed. Two contact models, i.e., the Mohr-Coulomb linear and hyperbolic nonlinear models, are adopted. The stress-strain behavior of sand is simulated using the user-defined hypoplastic model through UMAT subroutine. By comparing with that of the existing centrifuge test results, the performance of the proposed numerical model is validated. The results indicate that the nonlinear contact model adopted is superior to the linear contact model in capturing the performance of the CD wall during excavation. This is because that the nonlinear contact model has an ability to account for the nonuniform distribution of interfacial shear stress between the wall bottom and the surrounding soil as well as the stress concentration phenomenon in the critical part of the wall. The lateral earth pressure on the wall has not reached its ultimate state, and an obvious spatial distribution feature of the lateral earth pressure can be observed. The mode of the horizontal displacement of the wall is cantilever, while the mode of the vertical displacement at wall top can be regarded as integral rotation with the front-wall settling and the back-wall uplifting. The distributions of the bending moment in the middle of the back- and front-walls are similar. The results obtained are helpful for the design optimization of CD wall for supporting excavation.
  • 图  1   理想弹塑性库仑摩擦模型与双曲线接触模型示意图

    Figure  1.   Schematic diagrams of elastic perfectly-plastic Coulomb friction model and hyperbolic friction model

    图  2   离心模型试验装置及数据采集设备[14]

    Figure  2.   Centrifuge model testing system

    图  3   有限元模型网格

    Figure  3.   Mesh of finite element model

    图  4   基坑开挖过程中格形墙典型位置土压力沿埋深分布规律

    Figure  4.   Distribution of earth pressure on cellular diaphragm wall with depth below ground surface at typical positions during excavation

    图  5   格形墙不同位置土压力沿埋深分布规律对比

    Figure  5.   Comparison of distributions of lateral earth pressure on cellular diaphragm wall with depth below ground surface at different positions

    图  6   格形墙不同位置水平位移沿埋深分布规律对比

    Figure  6.   Comparison of distributions of horizontal displacement of cellular diaphragm wall with depth below ground surface

    图  7   格形墙不同位置的墙顶水平位移对比

    Figure  7.   Comparison of maximum horizontal displacement of cellular diaphragm wall at different positions

    图  8   格形墙顶面竖向位移云图

    Figure  8.   Contours of vertical displacement at top of cellular diaphragm wall

    图  9   格形墙典型位置弯矩随埋深分布规律

    Figure  9.   Distribution of bending moment of cellular diaphragm wall at typical positions

    图  10   基坑开挖10 m时格形墙与土体接触面剪应力分布云图

    Figure  10.   Contours of shear stress on interface between cellular diaphragm wall and soil at excavation depth of 10 m

    表  1   数值模型参数

    Table  1   Parameters required for finite element model

    类别本构模型参数
    砂土亚塑性模型φc= 30°,hs= 2.6 GPa,ns = 0.27,edo = 0.61,eco = 0.98,eio = 1.10,α = 0.14,β = 3,mR = 8,mT = 4,R = 2×10-5,βr = 0.1,κ = 1.0,K0 = 0.5
    格形墙线性弹性模型Edw= 27GPa,vdw= 0.167,γdw= 25 kN/m3
    接触面库仑摩擦模型μ = 0.3
    接触面双曲线接触模型δ = 24.48°,Rf = 0.87,n = 1.0,KI = 75000,γw= 10 kN/m3,pa = 101.3 kPa,c = 0
    注:φc为土体临界状态内摩擦角;hs,ns为控制正常压缩线和临界状态线形状的参数;α,β为指数;edo为零压力下的最小孔隙比;eco为零压力下的临界孔隙比;eio为零压力下的最大孔隙比;mR为控制180°应变路径逆转下的初始剪切模量的参数;mT为控制90°应变路径逆转下的初始剪切模量的参数;R为应变空间中弹性范围的大小;βr,κ为控制刚度随应变衰减速率的参数;K0为静止土压力系数;Edw为墙体弹性模量;νdw为墙体泊松比;γdw为墙体重度;μ为墙土接触面摩擦系数;δ为墙土接触面摩擦角;Rf为破坏比;n为刚度指数;KI为无量纲刚度系数;γw为水的重度;pa为标准大气压;c为墙土接触面黏聚力。
    下载: 导出CSV
  • [1] 张旷成, 李继民. 杭州地铁湘湖站“08.11.15”基坑坍塌事故分析[J]. 岩土工程学报, 2010, 32(增刊1): 338-342. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2010S1068.htm

    ZHANG Kuang-cheng, LI Ji-min. Accident analysis for “08.11.15” foundation pit collapse of Xianghu Station of Hangzhou metro[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(S1): 338-342. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2010S1068.htm

    [2] 杨宇, 王奎, 刘佑祥, 等. 某深厚软土基坑事故分析及抢险加固设计案例[J]. 岩土工程学报, 2014, 36(增刊1): 175-179. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2014S1032.htm

    YANG Yu, WANG Kui, LIU You-xiang, et al. Analysis and reinforcement design case of deep silt excavation accident[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(S1): 175-179. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2014S1032.htm

    [3] 龚晓南. 南宁基坑坍塌事故引起的思考[J]. 地基处理, 2019, 1(1): 95-96. https://www.cnki.com.cn/Article/CJFDTOTAL-DJCL201901019.htm

    GONG Xiao-nan. Thoughts on Nanning foundation pit collapse accident[J]. Journal of Ground Improvement, 2019, 1(1): 95-96. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-DJCL201901019.htm

    [4] 姜叶翔, 赖小勇, 张宏建, 等. 深基坑开挖对邻近既有地铁隧道的影响分析[J]. 地基处理, 2020, 2(3): 231-235. https://www.cnki.com.cn/Article/CJFDTOTAL-DJCL202003016.htm

    JIANG Ye-xiang, LAI Xiao-yong, ZHANG Hong-jian, et al. Impact of deep excavation on adjacent subway tunnels[J]. Journal of Ground Improvement, 2020, 2(3): 231-235. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-DJCL202003016.htm

    [5] 牛要闯. 杭海城际铁路某车站基坑临近天桥结构段设计及施工关键技术分析[J]. 地基处理, 2019, 1(2): 76-81.

    NIU Yao-chuang. The design and construction key technologies for a metro station pit near an overbridge in the construction of HANGHAI intercity railway[J]. Chinese Journal of Ground Improvement, 2019, 1(2): 76-81. (in Chinese)

    [6] 韩梅, 俞涛, 徐山岱, 等. 邻近地铁基坑围护结构的设计及变形控制措施[J]. 地基处理, 2019, 1(1): 57-62. https://www.cnki.com.cn/Article/CJFDTOTAL-DJCL201901014.htm

    HAN Mei, YU Tao, XU Shan-dai, et al. Design and deformation control measures for enclosure structure of foundation pit adjacent to subway[J]. Journal of Ground Improvement, 2019, 1(1): 57-62. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-DJCL201901014.htm

    [7] 吴九江, 程谦恭, 文华, 等. 软土地基格栅式地下连续墙与群桩桥梁基础竖向承载性状对比模型试验研究[J]. 岩土工程学报, 2014, 36(9): 1733-1744. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201409029.htm

    WU Jiu-jiang, CHENG Qian-gong, WEN Hua, et al. Vertical bearing behaviors of lattice shaped diaphragm walls and group piles as bridge foundations in soft soils[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1733-1744. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201409029.htm

    [8] 梅英宝. 自立式格形地下连续墙围护基坑变形实测分析[J]. 岩土工程学报, 2010, 32(增刊1): 463-467.

    MEI Ying-bao. Measured deformation of self-supporting lattice concrete diaphragm walls[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(S1): 463-467. (in Chinese)

    [9] 梁穑稼, 徐伟, 陈宇. 格形地下连续墙基坑施工阶段侧向变形[J]. 西南交通大学学报, 2015, 50(1): 150-155, 172. https://www.cnki.com.cn/Article/CJFDTOTAL-XNJT201501024.htm

    LIANG Se-jia, XU Wei, CHEN Yu. Lateral deformation of cellular diaphragm wall at excavation stage[J]. Journal of Southwest Jiaotong University, 2015, 50(1): 150-155, 172. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-XNJT201501024.htm

    [10] 左玉柱, 徐伟, 徐赞云. 砂土中格形地下连续墙力学性能离心试验研究[J]. 岩土工程学报, 2010, 32(增刊1): 473-477. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2010S1093.htm

    ZUO Yu-zhu, XU Wei, XU Zan-yun. Centrifugal model tests on mechanical property of gridding continuous diaphragm walls in sand[J]. Chinese Journal of Geotechnical Engineering, 2010, 32(S1): 473-477. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC2010S1093.htm

    [11] 周广柱, 徐伟, 陈宇. 格形地连墙与软土相互作用的离心试验研究[J]. 岩土力学, 2011, 32(增刊1): 134-140, 252. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2011S1025.htm

    ZHOU Guang-zhu, XU Wei, CHEN Yu. Centrifugal model test study of interaction of gridding concrete retaining wall and soft soil[J]. Rock and Soil Mechanics, 2011, 32(S1): 134-140, 252. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX2011S1025.htm

    [12] 陈希, 徐伟, 左玉柱. 格型地下连续墙工作性状的离心模型试验研究[J]. 工业建筑, 2013, 43(2): 67-71. https://www.cnki.com.cn/Article/CJFDTOTAL-GYJZ201302015.htm

    CHEN Xi, XU Wei, ZUO Yu-zhu. Centrifugal model tests on mechanical property of cellular diaphragm wall[J]. Industrial Construction, 2013, 43(2): 67-71. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-GYJZ201302015.htm

    [13] 侯永茂. 软土地层中格形地下连续墙围护结构性状研究[D]. 上海: 上海交通大学, 2010.

    HOU Yong-mao. Behavior of Cellular Diaphragm Wall in Soft Deposit[D]. Shanghai: Shanghai Jiao Tong University, 2010. (in Chinese)

    [14]

    CHEN X, XU W. Parametric sensitivity analysis of cellular diaphragm wall[J]. Frontiers of Structural and Civil Engineering, 2012, 6(4): 358-364.

    [15]

    CLOUGH G W, DUNCAN J M. Finite element analyses of retaining wall behavior[J]. Journal of the Soil Mechanics and Foundations Division, 1971, 97(12): 1657-1673.

    [16]

    JANBU N. Soil compressibility as determined by oedometer test and triaxial tests[C]//Proceedings of the European Conference on Soil Mechanics and Foundation Engineering, 1963, Weisbaden.

    [17]

    HERLE I, GUDEHUS G. Determination of parameters of a hypoplastic constitutive model from properties of grain assemblies[J]. Mechanics of Cohesive-frictional Materials, 1999, 4(5): 461-486.

    [18]

    MAEDA K, MIURA K. Confining stress dependency of mechanical properties of sands[J]. Soils and Foundations, 1999, 39(1): 53-57.

    [19]

    YAMASHITA S, JAMIOLKOWSKI M, LO PRESTI D C F L. Stiffness nonlinearity of three sands[J]. Journal of Geotechnical and Geoenvironmental Engineering, 2000, 126(10): 929-938.

    [20]

    JÁKY J. The coefficient of earth pressure at rest[J]. Journal of the Society of Hungarian Architects and Engineers, 1944, 7: 355-358.

图(10)  /  表(1)
计量
  • 文章访问数: 
  • HTML全文浏览量:  0
  • PDF下载量: 
  • 被引次数: 0
出版历程
  • 收稿日期:  2020-09-18
  • 网络出版日期:  2022-12-02
  • 刊出日期:  2021-06-30

目录

    /

    返回文章
    返回