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红砂岩剪切储能与最大剪应变特征试验研究

王云飞 马勇超 李志超 王立平 荣腾龙

王云飞, 马勇超, 李志超, 王立平, 荣腾龙. 红砂岩剪切储能与最大剪应变特征试验研究[J]. 工程力学, 2023, 40(2): 66-73. doi: 10.6052/j.issn.1000-4750.2021.06.0470
引用本文: 王云飞, 马勇超, 李志超, 王立平, 荣腾龙. 红砂岩剪切储能与最大剪应变特征试验研究[J]. 工程力学, 2023, 40(2): 66-73. doi: 10.6052/j.issn.1000-4750.2021.06.0470
WANG Yun-fei, MA Yong-chao, LI Zhi-chao, WANG Li-ping, RONG Teng-long. EXPERIMENTAL STUDY ON SHEAR STRAIN ENERGY AND MAXIMUM SHEAR STRAIN CHARACTERISTICS OF RED SANDSTONE[J]. Engineering Mechanics, 2023, 40(2): 66-73. doi: 10.6052/j.issn.1000-4750.2021.06.0470
Citation: WANG Yun-fei, MA Yong-chao, LI Zhi-chao, WANG Li-ping, RONG Teng-long. EXPERIMENTAL STUDY ON SHEAR STRAIN ENERGY AND MAXIMUM SHEAR STRAIN CHARACTERISTICS OF RED SANDSTONE[J]. Engineering Mechanics, 2023, 40(2): 66-73. doi: 10.6052/j.issn.1000-4750.2021.06.0470

红砂岩剪切储能与最大剪应变特征试验研究

doi: 10.6052/j.issn.1000-4750.2021.06.0470
基金项目: 国家自然科学基金项目(U1604142);河南省重点研发与推广专项项目(212102310405,212102310293);河南省高等学校重点科研项目(21A440011)
详细信息
    作者简介:

    马勇超(1996−),男,河南人,硕士生,主要从事岩体工程稳定性方面的研究(E-mail: myc0729@126.com)

    李志超(1989−),男,河南人,讲师,博士,主要从事岩体水力压裂与流固耦合理论研究(E-mail: zhichaoli@hpu.edu.cn)

    王立平(1979−),男,山西人,讲师,博士,主要从事岩体工程稳定性方面的研究(E-mail: wlp1116@163.com)

    荣腾龙(1988−),男,河南人,讲师,博士,主要从事多场耦合岩体力学特性研究(E-mail: rongtl@hpu.edu.cn)

    通讯作者:

    王云飞(1978−),男,内蒙古人,副教授,博士,主要从事岩体工程稳定性方面的研究(E-mail: wyf_ustb@126.com)

  • 中图分类号: TU45

EXPERIMENTAL STUDY ON SHEAR STRAIN ENERGY AND MAXIMUM SHEAR STRAIN CHARACTERISTICS OF RED SANDSTONE

  • 摘要: 为了明确干燥和饱水红砂岩剪切强度、剪切储能与剪应变特征,在岩石剪切试验系统进行了不同法向应力作用下干燥和饱水红砂岩剪切试验,详细分析了法向应力和饱水作用对红砂岩剪切强度、剪切应变能密度和剪应变的影响规律。结果表明:剪力-剪切位移曲线,干燥状态线性段明显,饱水状态屈服段明显,法向应力在10 MPa~20 MPa,剪切强度和剪切位移增加显著,法向应力在20 MPa~40 MPa切向位移变化很小;压剪应力状态下的粘聚力和内摩擦角明显低于三轴压缩应力状态下的粘聚力和内摩擦角,饱水使三轴应力路径下的粘聚力和内摩擦角都弱化,而压剪应力路径下只对内摩擦角弱化。法向应力小于20 MPa时,剪切强度劣化率随法向应力的增加线性增大,法向应力在20 MPa~40 MPa时,剪切强度劣化率在一定值上下波动。峰值剪切应变能密度与法向应力之间存在良好线性变化规律,随法向应力增大,饱水对峰值剪切应变能密度的影响增加。干燥和饱水红砂岩峰值剪切应变能密度分别趋于定值1.4579 MJ/m3和1.0033 MJ/m3,饱水使峰值剪切应变能密度的劣化率趋于31.18%。根据峰值剪应变随法向应力的变化规律,构建了干燥和饱水红砂岩剪应变经验强度准则。所得成果对红砂岩工程设计及工程稳定性分析具有一定参考价值。
  • 图  1  干燥和饱水红砂岩试样

    Figure  1.  Dry and saturated samples of red sandstone

    图  2  剪切试验系统

    Figure  2.  The shear test device

    图  3  干燥和饱水红砂岩剪力与剪切位移曲线

    Figure  3.  Shear force -displacement curves of dry and saturated red sandstone under different normal stresses

    图  4  红砂岩剪切破坏试样

    Figure  4.  Shear failure samples of dry and saturated red sandstone

    图  5  红砂岩剪切破坏剪应力与法向应力关系

    Figure  5.  Variation of red sandstone shear stress with normal stress in direct shear tests

    图  6  红砂岩三轴压缩的最大和最小主应力关系

    Figure  6.  The relationship between the maximum and minimum principal stresses of red sandstone under compression tests

    图  7  强度劣化率与围压/法向应力关系

    Figure  7.  Relationship between strength degradation rate and confining pressure/normal stress

    图  8  红砂岩剪应变计算图

    Figure  8.  Diagram for shear strain calculation of red sandstone

    图  9  峰值剪切应变能密度与法向应力关系

    Figure  9.  Relationship between shear strain energy density at peak and normal stress

    图  10  峰值剪切应变能密度与压缩应变能密度关系

    Figure  10.  Relationship between shear strain energy density at peak and compressive elastic strain energy

    图  11  最大剪应变随法向应力的变化规律

    Figure  11.  Peak shear strain curves vs. normal stress

    表  1  压缩和剪切试验红砂岩的强度参数对比

    Table  1.   Comparison of strength parameters of red sandstone in compression and shear tests

    工况系数k系数m/MPa粘聚力c/MPa内摩擦角$\varphi $/(°)
    三轴压缩(干燥)5.3190.3319.5943.09
    三轴压缩(饱水)4.7864.7014.7940.86
    剪切试验(干燥)6.2029.15
    剪切试验(饱水)6.0224.20
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-06-23
  • 修回日期:  2021-09-04
  • 网络出版日期:  2021-09-17
  • 刊出日期:  2023-02-01

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