| 非规则砂岩节理剪切变形本构关系试验研究 |
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| 引用本文： | 程坦,郭保华,孙杰豪,田世轩,孙崇轩,陈岩.非规则砂岩节理剪切变形本构关系试验研究[J].岩土力学,2022,43(1):51-64. |
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| 作者姓名： | 程坦 郭保华 孙杰豪 田世轩 孙崇轩 陈岩 |
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| 作者单位： | 1. 河南理工大学 能源科学与工程学院，河南 焦作 454000；
2. 河南理工大学 煤炭安全生产河南省协同创新中心，河南 焦作 454000 |
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| 基金项目： | 国家自然科学基金项目(No.51904092,52104127);河南省高校基本科研业务费专项资金资助(No.NSFRF180336,No.NSFRF210303);河南省自然科学基金资助项目(No.202300410183);河南省高校重点科研项目基金资助项目(No.21A440003)。 |
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| 摘 要： | 岩石节理剪切变形对岩体工程的安全性和稳定性具有重要影响。为研究常法向应力下岩石节理剪切变形本构关系，采用RDS-200型岩石直剪仪对非规则砂岩节理进行了不同法向应力下的直剪试验。根据岩石节理剪切应力?位移全程曲线形状特征，将其依次划分为峰前压密阶段、线性阶段、屈服阶段和峰后软化阶段；根据剪切应力在峰后软化阶段降低幅度和速率大小，将岩石节理剪切应力?位移曲线划分为3种类型：峰后平台型、峰后缓降型和峰后跌落型。基于岩石节理剪切应力?位移曲线各阶段剪切变形特征，采用分段函数建立了岩石节理剪切变形本构模型。与其他模型相比，新提出的岩石节理剪切变形本构模型对试验数据拟合精度更高，更好地描述了岩石节理剪切应力?位移全程曲线。另外，在通过岩石节理直剪试验由经验公式确定模型参数之后，所提出本构模型可在不同法向应力下实现对不同粗糙度岩石节理剪切应力?位移曲线的预测。研究结果对岩石节理剪切变形的数值模拟和工程估计具有一定的实用价值。
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| 关 键 词： | 岩石力学 岩石节理 剪切变形 本构关系 经验公式 |
| 收稿时间： | 2021-06-03 |
| 修稿时间： | 2021-09-09 |
Establishment of constitutive relation of shear deformation for irregular joints in sandstone |
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| CHENG Tan,GUO Bao-hua,SUN Jie-hao,TIAN Shi-xuan,SUN Chong-xuan,CHEN Yan.Establishment of constitutive relation of shear deformation for irregular joints in sandstone[J].Rock and Soil Mechanics,2022,43(1):51-64. |
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| Authors: | CHENG Tan GUO Bao-hua SUN Jie-hao TIAN Shi-xuan SUN Chong-xuan CHEN Yan |
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| Institution: | 1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo, Henan 454000, China;
2. The Collaborative Innovation Center of Coal Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo, Henan 454000, China |
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| Abstract: | The shear deformation of rock joints is significant for the safety and stability of rock engineering. In order to study the constitutive relation of shear deformation in jointed rock mass under a normal stress, the direct shear tests under different normal stresses were carried out on the sandstone specimens with irregular joints using the RDS-200 rock direct shear test system. Based on the shear stress - deformation curve of the jointed rock, it can be divided into four stages including pre-peak compaction stage, linear stage, yield stage and post-peak softening stage. The post-peak softening stage can be further divided into three types including platform type, gradual decline type and drop type based on the decreasing magnitude and rate of shear stress at the post-peak period. The shear deformation constitutive model of the sandstone with irregular joints was established using piecewise function based on the shear deformation characteristics at different stages. Compared with the existing constitutive models, the new proposed shear deformation constitutive model of the jointed rock mass has a much higher fitting accuracy for the experimental results, which can better describe the deformation characteristics of the jointed rock in the whole shear process. The shear stress-shear displacement curve of irregular joints with different roughness coefficients under different normal stresses can be predicted after determining the relevant model parameters in the corresponding empirical formula after some direct shear tests. The research is practical for understanding the shear deformation of joints in rocks by numerical simulation and the safety evaluation of engineering. |
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| Keywords: | rock mechanics rock joints shear deformation constitutive relation empirical formula |
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