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首页> 外文期刊>Environmental earth sciences >The length of pre-existing fissure effects on the dilatancy behavior, acoustic emission, and strength characteristics of cracked sandstone under different confining pressures
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The length of pre-existing fissure effects on the dilatancy behavior, acoustic emission, and strength characteristics of cracked sandstone under different confining pressures

机译：在不同围压下，裂隙长度对裂隙砂岩的剪胀特性，声发射和强度特性的影响

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摘要

It is significant to study the dilatancy behavior and strength characteristic of cracked rock to ensure the stability and safety of engineering rock mass. Consequently, the effects of the length of pre-existing fissures and confining pressure on the strength characteristic of sandstone specimens were analyzed, and the dilatancy and acoustic emission (AE) behaviors of sandstone specimens with different lengths of pre-existing fissures under different confining pressures were discussed. The rationality of the stress of dilatancy onset can be as the strength parameter of rock is explained from the cohesion and internal friction characteristics of rock material and its dilatancy behavior. The results show that the strength parameters of sandstone specimens are negative related to the length of pre-existing fissures, but positive related to the confining pressure. The difference between the stress of dilatancy onset and peak strength decreases with the increase of length of pre-existing fissures, but increases with confining pressure, which is related to the internal friction characteristic of rock material. Under the condition of uniaxial compression or low confining pressure, the obvious stress drop easily occurs after the dilatancy onset, and the frequency of this phenomenon is positive related to the length of pre-existing fissures. However, this phenomenon gradually decreases with the increase of confining pressure, it correspondingly transforms to the emergence of yield platform. No matter what occurrence of stress drop or yield platform, all the cracked rock specimens show the special characteristics of drastic increase of volume dilatancy, active AE signals, and full evolution of cracks. After the dilatancy onset, it seems to be more insecure from the way to obtain the higher strength parameters by the frequent occurrence of cohesive particles fracture in rock, and the rock material can still rely on crack friction to load. In addition, from the dilatancy behavior of rock material, it seems that the large deformations always appear after the dilatancy onset, which is more likely to cause the potential engineering danger.
机译：研究裂隙岩的剪胀特性和强度特性对保证工程岩体的稳定性和安全性具有重要意义。因此，分析了预先存在的裂缝的长度和围压对砂岩标本强度特性的影响，并研究了不同围压下不同长度的现有裂缝的砂岩标本的扩容和声发射行为。进行了讨论。从岩石材料的内聚力，内摩擦特性及其剪胀性来解释岩石的强度参数，是剪胀开始应力的合理性。结果表明，砂岩试件的强度参数与既有裂缝的长度成负相关，与围压大小成正相关。剪胀开始应力与峰值强度之间的差异随着既有裂缝长度的增加而减小，但随着围压的增加而增大，这与岩石材料的内摩擦特性有关。在单轴压缩或低围压的条件下，剪胀开始后应力明显下降，且这种现象的发生频率与既有裂缝的长度成正比。然而，随着围压的增加，这种现象逐渐减少，并相应地转变为屈服平台的出现。无论出现什么应力下降或屈服平台，所有破裂的岩石样本都具有体积膨胀率急剧增加，有效的AE信号以及裂纹完全演化的特殊特征。膨胀开始后，由于岩石中经常发生内聚性颗粒破裂，获得更高强度参数的方法似乎更加不安全，岩石材料仍可以依靠裂纹摩擦来加载。另外，从岩石材料的剪胀特性来看，似乎在剪胀开始后总是出现大的变形，这很可能引起潜在的工程危险。

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  • 来源
    《Environmental earth sciences》 |2018年第12期|430.1-430.14|共14页
  • 作者

    Wu Jiangyu; Chen Zhanqing; Feng Meimei; Wang Yiming; Han Guansheng;

  • 作者单位

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Sch Mech & Civil Engn, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Rock mechanics; Pre-existing fissures; Strength; Dilatancy behavior; Acoustic emission;

    机译：岩石力学;既有裂缝;强度;剪胀行为;声发射;

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