黄土各向异性强度特性的真三轴试验研究

    邵生俊, 许萍, 王强, 代亚锋

    邵生俊, 许萍, 王强, 代亚锋. 黄土各向异性强度特性的真三轴试验研究[J]. 岩土工程学报, 2014, 36(9): 1614-1623. DOI: 10.11779/CJGE201409007
    引用本文: 邵生俊, 许萍, 王强, 代亚锋. 黄土各向异性强度特性的真三轴试验研究[J]. 岩土工程学报, 2014, 36(9): 1614-1623. DOI: 10.11779/CJGE201409007
    SHAO Sheng-jun, XU Ping, WANG Qiang, DAI Ya-feng. True triaxial tests on anisotropic strength characteristics of loess[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1614-1623. DOI: 10.11779/CJGE201409007
    Citation: SHAO Sheng-jun, XU Ping, WANG Qiang, DAI Ya-feng. True triaxial tests on anisotropic strength characteristics of loess[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1614-1623. DOI: 10.11779/CJGE201409007

    黄土各向异性强度特性的真三轴试验研究  English Version

    基金项目: 国家自然科学基金项目(41272320); 陕西省教育厅省级重点实验室项目(2010JS084)
    详细信息
      作者简介:

      邵生俊(1964- ),男,甘肃武威人,教授,博士生导师,主要从事土动力学与黄土力学研究。E-mail: sjshao@xaut.edu.cn。

    • 中图分类号: TU43

    True triaxial tests on anisotropic strength characteristics of loess

    • 摘要: 黄土水平面内沉积结构及其发育的竖向裂隙构造使其具有明显的各向异性特征。通过黄土竖直裂隙向及其正交方向作用三维主应力状态几何空间八面体平面上3个空间域的真三轴试验,揭示了各空间域不同中主应力比值应力路径的剪切应力应变变化规律及抗剪强度变化规律。表明黄土竖向裂隙向作用大主应力的抗剪应力均大于水平面内正交两向作用大主应力的抗剪应力;中主应力增强作用能够诱导黄土的各向异性结构性;横观各向同性或者各向异性黄土八面体面上的强度破坏面随着平均球应力增大均呈椭圆、圆和曲边三角形变化,椭圆形破坏面可分别由轴对称压缩空间滑动面强度准则或轴对称挤伸空间滑动面强度准则近似地描述。
      Abstract: The structure of loess consisting of horizontally deposited planes and vertically extended micro-fractures makes the anisotropic strength behavior of loess remarkable. Through triaxial tests, three principal stresses are alternatively loaded on loess specimens along the direction of vertical micro-fracture and two orthogonal directions in horizontally deposited plane, whose stress conditions are respectively corresponding to three sectors in the octahedral plane of geometric space. The experimental results reveal the laws of shear stress-strain and strength under different stress paths that the shear stress when the major principal stress is applied in the direction of vertical fracture is commonly larger than one during the major principal stress is loaded in the two orthogonal directions; the larger intermediate principal stress can induce more significant anisotropic structure of loess; the yield loci in the octahedral plane for cross-isotropic or cross-anisotropic loess appear to be elliptical, circular and triangular with curved edges changing with the increase of spherical stress, and elliptical yield locus can be approximatively expressed by the strength criterion of AC-SMP or AE-SMP.
    • [1] CASAGRANDE A, CARILLO N. Shear failure of anisotropic materials[J]. J Boston Soc Civ Eng, 1944, 31(4): 74-87.
      [2] DUNCAN J M, SEED H B. Anisotropy and stress reorientation in clay[J]. J Soil Mech Found Div, 1966, 92(5): 21-50.
      [3] ODA M, KOISHIKAWA I, HIGUCHI T. Experimental study of anisotropic shear strength of sand by plane strain test[J]. Soils and Foundations, 1978, 18(1): 25-38.
      [4] ODA M. Fabric tensor for discontinuous geological materials[J]. Soils and Foundations, 1982, 22(4): 96-108.
      [5] KIRKGARD M M, LADE P V. Anisotropy three- dimensional behavior of a normally consolidated clay[J]. Canadian Geotechnical Journal, 1993, 30(5): 848-858.
      [6] ABELEV A V, LADE P V. Effects of cross-anisotropy on three-dimensional behavior of sand I: Stress-strain Behavior and Shear Banding[J]. Journal of Engineering Mechanics, 2003, 129(2): 160-166.
      [7] LADE P V, ABELEV A V. Effects of cross-anisotropy on three-dimensional behavior of sand. II: Volume change behavior and failure[J]. J Eng Mech, 2003, 129(2): 167-174.
      [8] 姚仰平, 孔玉侠. 横观各向同性土强度与破坏准则的研究.水利学报, 2012, 43(1): 43-50. (YAO Yang-ping, KONG Yu-xia. Strength and characterization of failure in cross-anisotropic soils[J]. Journal of Hydraulic Engineering, 2012, 43(1): 43-50. (in Chinese))
      [9] 邵生俊, 许 萍, 陈昌禄. 土的剪切空间滑动面分析及各向异性强度准则研究[J]. 岩土工程学报, 2013, 35(3): 422-435. (SHAO Sheng-jun, XU Ping, CHEN Chang-lu. Several shear spatially mobilized planes and anisotropic strength criteria of soils[J]. Chinese Journal of Geotechnical Engineering, 2013, 35(3): 422-435. (in Chinese))
      [10] 邵生俊, 罗爱忠, 邓国华, 等. 一种新型真三轴仪的研制与开发[J]. 岩土工程学报, 2009, 31(8): 1172-1179. (SHAO Sheng-jun, LUO Ai-zhong, DENG Guo-hua, et al. Development of a new true tri-axial apparatus[J]. Chinese Journal of Geotechnical Engineering, 2009, 31(8): 1172-1179. (in Chinese))
      [11] 邵生俊, 郑 文, 王正泓, 等. 黄土的构度指标及其试验确定方法[J]. 岩土力学, 2010, 31(1): 15-20. (SHAO Sheng-jun, ZHENG Wen, WANG Zheng-hong, et al. Structural index of loess and its testing method[J]. Rock and Soil Mechanics, 2010, 31(1): 15-20. (in Chinese))
    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:  2013-11-14
    • 发布日期:  2014-09-21

    目录

      /

      返回文章
      返回