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首页> 外文期刊>Arabian Journal for Science and Engineering >Study of the Mechanical Properties and Fracture Evolution of Sandstone with Different Moisture Contents Under True Triaxial Stress
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Study of the Mechanical Properties and Fracture Evolution of Sandstone with Different Moisture Contents Under True Triaxial Stress

机译：不同水分含量下砂岩机械性能和骨折演化研究真正的三轴应力

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摘要

The typical sandstone of the Shendong mining area, China, was considered as the research object in order to determine the mechanical properties and fracture evolution characteristics under true triaxial stress and different moisture contents by X-ray diffraction, true triaxial mechanical test, and CT scanning. The results show that the main mineral components of the sandstone are quartz, plagioclase, potassium feldspar, siderite, and clay minerals (kaolinite, illite, and chlorite), with clay minerals accounting for 25.7%. When σ_2 > σ_3, after sandstone failure, compressive deformation occurs in the ε_2 direction, while expansion deformation occurs in the ε_3 direction. A larger σ_3 corresponds to a higher moisture content and a greater ductility of sandstone. σ_3 influences the sandstone failure mode more significantly, compared with σ_2 and moisture content. For a constant moisture content, the sandstone’s compressive strength and the Young’s modulus increase with increase in σ_3. On the contrary, as σ_2 increases, the compressive strength and the Young’s modulus first increase and then decrease for all moisture contents. Additionally, when the stress state is kept the same, as the moisture content increases, the compressive strength and the Young’s modulus of the sandstone decrease. Similarly, for the same moisture content, with increase in σ_2, the smaller the number of fractures after sandstone failure and the more regular the fracture distribution. Moreover, under the same stress conditions, dry sandstone has the least regular fracture development after failure, followed by saturated sandstone, while the sandstone with natural moisture content has the most regular fracture development after failure.
机译：中国神社矿区的典型砂岩被认为是研究对象，以确定真正的三轴应力和X射线衍射不同水分含量的机械性能和骨折进化特性，真正的三轴机械测试和CT扫描。结果表明，砂岩的主要矿物成分是石英，Plagioclase，钾钾，赤铁矿和粘土矿物质（高潮，伊利钠和氯酸盐），粘土矿物质占25.7％。当Σ_2>Σ_3，在砂岩故障后，在ε_2方向上发生压缩变形，而在ε_3方向上发生膨胀变形。较大的σ_3对应于更高的水分含量和更大的砂岩延展性。与σ_2和水分含量相比，更显着，更显着，影响砂岩失效模式。对于恒定的水分含量，砂岩的抗压强度和杨氏模量随σ_3的增加而增加。相反，随着σ_2的增加，抗压强度和杨氏模量首先增加，然后对所有水分含量降低。另外，当应力状态保持相同时，随着水分含量的增加，抗压强度和砂岩的杨氏模量减少。类似地，对于相同的水分含量，随着σ_2的增加，砂岩失效后裂缝的数量越小，骨折分布越常见。而且，在相同的压力条件下，干砂岩在失败后具有常规骨折发育，其次是饱和砂岩，而具有天然水分含量的砂岩具有最严重的骨折发育。

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  • 来源
    《Arabian Journal for Science and Engineering》 |2021年第11期|11497-11518|共22页
  • 作者

    Weinan Wang; Qiangling Yao; Chuanjin Tang; Xuehua Li; Zhaohui Chong;

  • 作者单位

    Key Laboratory of Deep Coal Resource Mining Ministry of Education China University of Mining and Technology Xuzhou 221116 China School of Mines China University of Mining and Technology Xuzhou 221116 China;

    Key Laboratory of Deep Coal Resource Mining Ministry of Education China University of Mining and Technology Xuzhou 221116 China School of Mines China University of Mining and Technology Xuzhou 221116 China;

    Department of Civil Engineering University of Nottingham Nottingham NG7 2RD UK;

    Key Laboratory of Deep Coal Resource Mining Ministry of Education China University of Mining and Technology Xuzhou 221116 China School of Mines China University of Mining and Technology Xuzhou 221116 China;

    Key Laboratory of Deep Coal Resource Mining Ministry of Education China University of Mining and Technology Xuzhou 221116 China School of Mines China University of Mining and Technology Xuzhou 221116 China;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Water–rock interaction; True triaxial; CT scanning; Sandstone; Mechanical properties; Fracture evolution;

    机译：水岩相互作用;真正的三轴;CT扫描;砂岩;机械性能;骨折演变;

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