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首页> 外文期刊>Bulletin of engineering geology and the environment >Experimental analysis and modeling of the mechanical behavior of breccia lava in the dam foundation of the Baihetan Hydropower Project
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Experimental analysis and modeling of the mechanical behavior of breccia lava in the dam foundation of the Baihetan Hydropower Project

机译：白鹤滩水电站坝基角砾岩熔岩力学特性的试验分析与建模。

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摘要

As a type of pyroclastic rock, the breccia lava in the dam foundation of the Baihetan Hydropower Project is characterized by relatively low density, high natural moisture content and porosity, and lower ultrasonic velocity. When it is used as a bearing rock, its mechanical behavior will be critical for the safety and stability of the world's second largest hydropower station. Therefore, uniaxial and triaxial compression tests were performed to study the mechanical behavior of the breccia lava and scanning electron microscope (SEM) tests were carried out to reveal the microscopic failure modes of this rock. The experimental results indicated that all critical stresses, including the crack initiation stress (sigma(ci)), crack damage stress (sigma(cd)), and peak stress (sigma(p)), exhibit strong dependence on the confining pressure. Experiential functions were used to describe the evolution of the elastic modulus and Poisson's ratio with confining pressure. Grain crushing and the growth and frictional sliding of microcracks were determined to cause the failure of the specimens. Based on the experimental results, a coupled elastoplastic damage model was proposed within a thermodynamic framework. In this model, two separate loading functions were employed to describe the damage and plasticity behavior of the breccia lava. A computational integration algorithm with high numerical accuracy and efficiency was developed to deal with the material under three different loading conditions: plasticity, damage, and coupled elastoplastic damage. The model was validated through comparison with the experimental data, and the good agreement between the two datasets confirms that the model can provide a good representation of mechanical behavior, particularly the post-peak behavior of the breccia lava.
机译：百河滩水电站坝基角砾岩熔岩是一种火山碎屑岩，具有密度低，天然含水量高，孔隙率高，超声波速低等特点。当用作承重岩时，其机械性能对于世界第二大水电站的安全性和稳定性至关重要。因此，进行了单轴和三轴压缩试验以研究角砾岩熔岩的力学行为，并进行了扫描电子显微镜（SEM）试验以揭示该岩石的微观破坏模式。实验结果表明，所有临界应力，包括裂纹萌生应力（sigma（ci）），裂纹破坏应力（sigma（cd））和峰值应力（sigma（p）），都与约束压力密切相关。经验函数用来描述弹性模量和泊松比随围压的变化。确定晶粒破碎以及微裂纹的生长和摩擦滑动会导致试样破坏。根据实验结果，在热力学框架内提出了耦合弹塑性损伤模型。在该模型中，采用了两个独立的加载函数来描述角砾岩熔岩的破坏和可塑性行为。开发了一种具有高数值精度和效率的计算集成算法，以处理三种不同载荷条件下的材料：可塑性，损伤和耦合弹塑性损伤。通过与实验数据的比较验证了该模型，并且两个数据集之间的良好一致性证实该模型可以很好地表示机械行为，尤其是角砾岩熔岩的峰后行为。

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    Jia Chaojun; Xu Weiya; Wang Susheng; Wang Rubin; Yu Jun;

  • 作者单位

    Hohai Univ, Res Inst Geotech Engn, Nanjing 210098, Jiangsu, Peoples R China|Hohai Univ, Res Inst Geotech Engn, Civil Engn & Transportat Dept, Rock Rheol Lab, Room 104,Sci Hall, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Res Inst Geotech Engn, Nanjing 210098, Jiangsu, Peoples R China|Hohai Univ, Res Inst Geotech Engn, Civil Engn & Transportat Dept, Rock Rheol Lab, Room 104,Sci Hall, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Res Inst Geotech Engn, Nanjing 210098, Jiangsu, Peoples R China|Hohai Univ, Res Inst Geotech Engn, Civil Engn & Transportat Dept, Rock Rheol Lab, Room 104,Sci Hall, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Res Inst Geotech Engn, Nanjing 210098, Jiangsu, Peoples R China|Hohai Univ, Res Inst Geotech Engn, Civil Engn & Transportat Dept, Rock Rheol Lab, Room 104,Sci Hall, Nanjing 210098, Jiangsu, Peoples R China;

    Hohai Univ, Res Inst Geotech Engn, Nanjing 210098, Jiangsu, Peoples R China|Hohai Univ, Res Inst Geotech Engn, Civil Engn & Transportat Dept, Rock Rheol Lab, Room 104,Sci Hall, Nanjing 210098, Jiangsu, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Breccia lava; Baihetan Hydropower Project; Mechanical behavior; Elastoplastic damage model;

    机译：角砾岩熔岩;白鹤滩水电站工程;力学行为;弹塑性损伤模型;

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