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首页> 外文期刊>Rock Mechanics and Rock Engineering >Estimation of Crack Initiation and Propagation Thresholds of Confined Brittle Coal Specimens Based on Energy Dissipation Theory
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Estimation of Crack Initiation and Propagation Thresholds of Confined Brittle Coal Specimens Based on Energy Dissipation Theory

机译：基于能量耗散理论的狭窄脆性煤试样的裂纹启动与传播阈值的估计

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摘要

A new energy-dissipation method to identify crack initiation and propagation thresholds is introduced. Conventional and cyclic loading-unloading triaxial compression tests and acoustic emission experiments were performed for coal specimens from a 980-m deep mine with different confining pressures of 10, 15, 20, 25, 30, and 35 MPa. Stress-strain relations, acoustic emission patterns, and energy evolution characteristics obtained during the triaxial compression tests were analyzed. The majority of the input energy stored in the coal specimens took the form of elastic strain energy. After the elastic-deformation stage, part of the input energy was consumed by stable crack propagation. However, with an increase in stress levels, unstable crack propagation commenced, and the energy dissipation and coal damage were accelerated. The variation in the pre-peak energy-dissipation ratio was consistent with the coal damage. This new method demonstrates that the crack initiation threshold was proportional to the peak stress (sigma(p)) for ratios that ranged from 0.4351 to 0.4753 sigma(p), and the crack damage threshold ranged from 0.8087 to 0.8677 sigma(p).
机译：引入了一种识别裂纹启动和传播阈值的新能量耗散方法。常规和循环载荷卸载三轴压缩试验和声发射实验是针对980米深矿井的煤试样进行的，具有10,15,20,25,30和35MPa的不同狭窄压力。分析了三轴压缩试验期间获得的应力应变关系，声发射图案和能量进化特性。储存在煤样中的大部分输入能量采用弹性应变能的形式。在弹性变形阶段之后，通过稳定的裂纹繁殖消耗部分输入能量。然而，随着应力水平的增加，开始不稳定的裂缝扩展，加速了能量耗散和煤损伤。预峰值能量消耗比的变化与煤损伤一致。该新方法表明裂缝起始阈值与峰值应力（Sigma（P））比例为0.4351至0.4753 sigma（P），并且裂缝损伤阈值范围为0.8087至0.8677 sigma（P）。

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  • 作者

    Ning Jianguo; Wang Jun; Jiang Jinquan; Hu Shanchao; Jiang Lishuai; Liu Xuesheng;

  • 作者单位

    Shandong Univ Sci &

    Technol State Key Lab Min Disaster Prevent &

    Control Shandong Prov &

    Minist Sci &

    Technol Qingdao 266590 Peoples R China;

    Shandong Univ Sci &

    Technol State Key Lab Min Disaster Prevent &

    Control Shandong Prov &

    Minist Sci &

    Technol Qingdao 266590 Peoples R China;

    Shandong Univ Sci &

    Technol State Key Lab Min Disaster Prevent &

    Control Shandong Prov &

    Minist Sci &

    Technol Qingdao 266590 Peoples R China;

    Shandong Univ Sci &

    Technol State Key Lab Min Disaster Prevent &

    Control Shandong Prov &

    Minist Sci &

    Technol Qingdao 266590 Peoples R China;

    Shandong Univ Sci &

    Technol State Key Lab Min Disaster Prevent &

    Control Shandong Prov &

    Minist Sci &

    Technol Qingdao 266590 Peoples R China;

    Shandong Univ Sci &

    Technol State Key Lab Min Disaster Prevent &

    Control Shandong Prov &

    Minist Sci &

    Technol Qingdao 266590 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 岩石（岩体）力学及岩石测试;
  • 关键词

    Acoustic emission; Coal damage; Energy accumulation and dissipation; Crack damage initiation; Crack damage stress;

    机译：声学发射;煤损伤;能量积累和耗散;裂纹损伤启动;裂纹损伤压力;

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