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

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

1.
河南理工大学土木工程学院，河南，焦作 454003
2.
河南理工大学能源科学与工程学院，河南，焦作 454003

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
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- 被引次数: 0
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

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

1.
School of Civil Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China
2.
School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454003, China

摘要

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。
- 红砂岩 /
- 干燥和饱水 /
- 强度 /
- 剪切应变能 /
- 剪应变
Abstract: Direct shear tests of dry and saturated red sandstone samples under different normal stresses were carried out in rock shear test system to determine shear strength, shear strain energy and maximum shear strain characteristics. The influences of normal stress and saturated water on shear strength, shear strain energy density, and shear strain of red sandstone were analyzed in detail. Results show that the shear force-shear displacement curve includes evidently linear and yielding sections in dry and saturation states, respectively. The shear strength and the shear displacement increase significantly when the normal stress is 10 MPa~20 MPa. The shear displacement slightly changes when the normal stress is 20 MPa~40 MPa. Red sandstone demonstrates significantly lower cohesion and internal friction angle under compression and shear stress than under triaxial compression stress. Saturated water weakens the cohesion and internal friction angle under triaxial stress path but only weakens the internal friction angle under compression and shear stress path. When the normal stress is less than 20 MPa, shear strength degradation rate increases linearly with the increasing of normal stress. When the normal stress is 20 MPa~40 MPa, shear strength degradation rate fluctuates at certain value. A good linear relationship exists between peak shear strain energy density and normal stress, and the effect of saturated water on peak shear strain energy density increases with the increasing of normal stress. The peak shear strain energy density of dry and saturated red sandstone samples remains constant at 1.4579 and 1.0033 MJ/m³, respectively, and the degradation rate of peak shear strain energy density is 31.18%. According to the variation in the peak shear strain energy density with normal stress, empirical strength criteria of shear strain for dry and saturated red sandstone samples were established when 20 MPa normal stress was taken as turning stress. The conclusions demonstrated certain reference significance for engineering design and stability analysis of red sandstone engineering.
- red sandstone /
- dry and saturated water /
- strength /
- shear strain energy /
- shear strain

HTML全文

图 1 干燥和饱水红砂岩试样

Figure 1. Dry and saturated samples of red sandstone

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图 2 剪切试验系统

Figure 2. The shear test device

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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

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图 4 红砂岩剪切破坏试样

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

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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

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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

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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

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图 8 红砂岩剪应变计算图

Figure 8. Diagram for shear strain calculation of red sandstone

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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

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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

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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

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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)	5.31	90.33	19.59	43.09
三轴压缩(饱水)	4.78	64.70	14.79	40.86
剪切试验(干燥)	−	−	6.20	29.15
剪切试验(饱水)	−	−	6.02	24.20

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