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各向同性土与横观各向同性土的力学特性和持水特性

郭楠 陈正汉 杨校辉 郭剑峰 孙树国

郭楠, 陈正汉, 杨校辉, 郭剑峰, 孙树国. 各向同性土与横观各向同性土的力学特性和持水特性[J]. 西南交通大学学报, 2019, 54(6): 1235-1243. doi: 10.3969/j.issn.0258-2724.20180065
引用本文: 郭楠, 陈正汉, 杨校辉, 郭剑峰, 孙树国. 各向同性土与横观各向同性土的力学特性和持水特性[J]. 西南交通大学学报, 2019, 54(6): 1235-1243. doi: 10.3969/j.issn.0258-2724.20180065
GUO Nan, CHEN Zhenghan, YANG Xiaohui, GUO Jianfeng, SUN Shuguo. Mechanical Properties and Water Holding Characteristics of Initially Isotropic Soils and Transversely Isotropic Soils[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1235-1243. doi: 10.3969/j.issn.0258-2724.20180065
Citation: GUO Nan, CHEN Zhenghan, YANG Xiaohui, GUO Jianfeng, SUN Shuguo. Mechanical Properties and Water Holding Characteristics of Initially Isotropic Soils and Transversely Isotropic Soils[J]. Journal of Southwest Jiaotong University, 2019, 54(6): 1235-1243. doi: 10.3969/j.issn.0258-2724.20180065

各向同性土与横观各向同性土的力学特性和持水特性

doi: 10.3969/j.issn.0258-2724.20180065
基金项目: 国家自然科学基金资助项目(11672330;51379220);陕西省科技统筹创新工程计划资助项目(2014KTDZ03-01)
详细信息
    作者简介:

    郭楠,(1987—),女,讲师,研究方向为非饱和土与特殊土力学及其工程应用,E-mail:guonan8810@126.com

    通讯作者:

    陈正汉(1947—),男,教授,研究方向为非饱和土与特殊土力学,E-mail:chenzhenghan47@163.com

  • 中图分类号: O 319.56

Mechanical Properties and Water Holding Characteristics of Initially Isotropic Soils and Transversely Isotropic Soils

  • 摘要: 为了探讨不同初始状态下非饱和黄土的力学性质和水量变化规律之间的差异,提出了制备各向同性及横观各向同性试样的方法,用改进的非饱和土三轴仪对制备的各向同性、横观各向同性及常规重塑试样进行了72个三轴固结排水剪切试验. 试验结果表明:对不同削样角度的各向同性试样进行试验验证,发现其近似各向同性;3种不同初始状态下各向同性非饱和试样的破坏应力最大,横观各向同性非饱和试样次之;横观各向同性试样在剪切阶段的初始切线模量最大,其他两组试样的初始切线模量较小且近似相等;各向同性试样及横观各向同性试样在剪切的初始阶段均有轻微的剪胀现象,常规重塑试样均处于剪缩状态;不同初始状态下的各非饱和试样在剪切阶段吸力变化对排水的影响并不显著,其中横观各向同性试样的偏应力-含水率关系曲线的斜率绝对值最小,其他两组试验的斜率几乎相同,各向同性、横观各向同性及常规的重塑试样的力学特性及持水特性不尽相同. 本文的研究成果可为不同初始状态下各模型的建立及工程应用提供有益的参考.

     

  • 图 1  不同角度各向同性试样切削过程

    Figure 1.  Cutting process of isotropic specimens with different angles

    图 2  各向同性试样q- $ {\varepsilon _{\rm a}}$关系曲线

    Figure 2.  Relation curves of q- ${\varepsilon _{\rm a}}$ for isotropic specimens

    图 3  各向同性试样${\varepsilon _{\rm{a}}}$-${\varepsilon _{\rm{v}}} $关系曲线

    Figure 3.  Relation curves of ${\varepsilon _{\rm{a}}}$-${\varepsilon _{\rm{v}}}$ for isotropic specimens

    图 4  横观各向同性 −K0预固结试样及常规重塑试样的$q$-$ {\varepsilon _{\rm{a}}}$${\varepsilon _{\rm{a}}} $-$ {\varepsilon _{\rm{v}}}$关系曲线

    Figure 4.  Relation curves of $q$-$ {\varepsilon _{\rm{a}}}$ and ${\varepsilon _{\rm{a}}}$-${\varepsilon _{\rm{v}}}$ for transversely isotropic specimens and remolded samples

    图 5  起始切线模量随净围压的变化

    Figure 5.  Variation of $\lg ({E}/{P_{\rm{a}}})$ with $\lg (p/{P_{\rm{a}}})$

    图 6  3组试样的q- $ w$关系曲线

    Figure 6.  Relation curves of q- $ w$ for different group specimens

    表  1  土样的基本物理指标

    Table  1.   Physical parameters of soil samples

    相对密度ds 塑限wp/% 液限wL/% 最大干密度
    ${\rho _{{\rm d}\max }}$/(g•cm−1
    最优含水率wop/%
    2.71 17.3 31.1 1.91 12.5
    下载: 导出CSV

    表  2  试验研究方案

    Table  2.   Experimental research programs

    试验组别 试验简称 控制竖向压力/kPa 削样角度/(°) 控制净围压/kPa 控制基质吸力/kPa
    1 各向同性试验 0 100、200、300 50、100、200
    45
    60
    90
    2 K0CD试验 100 100、200、300 0、50、100、200
    200
    3 CD试验 100、200、300 0、50、100、200
    下载: 导出CSV

    表  3  土样的强度参数

    Table  3.   Strength parameters

    吸力/kPa 净围压p/kPa qf/kPa pf/kPa φ/(°) c/kPa
    各向
    同性
    K0CD
    试验
    CD
    试验
    各向
    同性
    K0CD
    试验
    CD
    试验
    各向
    同性
    K0CD
    试验
    CD
    试验
    各向
    同性
    K0CD
    试验
    CD
    试验
    0 100 367.7 201.3 226.6 167.1 31.39 26.51 41.63 16.11
    200 596.2 400.9 398.7 333.7
    300 831.0 521.5 593.7 473.8
    50 100 341.5 312.1 276.0 213.8 204.0 192.0 26.61 28.93 27.13 58.08 37.25 30.98
    200 524.1 503.8 424.5 374.7 367.9 341.5
    300 665.4 686.9 610.8 521.8 529.0 503.6
    100 100 399.0 333.0 325.5 229.7 211.0 208.3 28.44 30.04 28.21 67.07 42.07 47.90
    200 564.3 557.7 525.1 388.1 385.9 375.0
    300 768.4 733.0 683.8 556.1 544.3 527.9
    200 100 447.4 433.3 409.3 249.1 244.4 236.4 31.35 31.61 29.2 70.56 62.61 67.50
    200 704.9 666.0 605.4 435.0 422.0 410.7
    300 892 873.8 790.3 602.7 591.3 563.4
    下载: 导出CSV

    表  4  剪切过程中土样的q-w关系曲线的斜率

    Table  4.   Slope of the q-w relation curve of soil samples in the shear process

    试样 吸力/kPa 净围压/kPa $\alpha$/(× 10–5 各吸力下$\alpha$的平均值/(× 10–5 平均值/(× 10–5
    各向同性 50 100 –3.27 –2.68 –2.62
    200 –2.63
    300 –2.15
    100 100 –3.09 –2.61
    200 –2.48
    300 –2.26
    200 100 –3.30 –2.56
    200 –2.39
    300 –2.00
    横观各向同性 0 100 –4.98 –4.43 –1.55
    200 –4.06
    300 –3.72
    50 100 –2.16 –1.55
    200 –1.33
    300 –1.16
    100 100 –1.44 –1.52
    200 –1.84
    300 –1.27
    200 100 –1.63 –1.59
    200 –1.69
    300 –1.45
    重塑 0 100 –6.82 –5.46 –2.59
    200 –5.05
    300 –4.50
    50 100 –3.02 –2.47
    200 –2.49
    300 –1.89
    100 100 –2.95 –2.48
    200 –2.49
    300 –1.99
    200 100 –3.20 –2.83
    200 –2.78
    300 –2.52
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-01-20
  • 修回日期:  2018-04-08
  • 网络出版日期:  2019-04-25
  • 刊出日期:  2019-12-01

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