加载速率和围压对煤能量演化影响试验研究

发布时间：2019-05-31 15:07

【摘要】：借助TAW-2000型电液伺服岩石力学试验系统进行了不同加载速率和不同围压下煤样的单轴压缩和三轴压缩试验,研究了加载速率和围压对煤样能量耗散特征的影响规律,探讨了煤样耗散应变能转化速率随加载速率和围压的变化规律。研究表明:单轴压缩试验第Ⅰ阶段试件的弹性应变能随加载速率的增加呈现先增大后减小的特点,耗散应变能转化速率均处于较低水平,且与加载速率呈负相关,第Ⅱ阶段耗散应变能随加载速率的增加也呈先增大后减小的趋势,各煤样耗散应变能转化速率的最大值均出现在峰值点或峰后轴向应力陡然跌落点。耗散应变能转化速率对围压十分敏感,围压越大,耗散应变能的转化速率也越大,煤样变形损伤越快。
[Abstract]:The effects of loading rate and confining pressure on the dissipation characteristics of coal-like energy are studied by means of the TAW-2000 electro-hydraulic servo-rock mechanical test system. The change of the rate of transformation of the coal-like dissipation strain with the loading rate and the confining pressure is discussed. The results show that the elastic strain energy of the test piece at the first stage of the uniaxial compression test can be increased with the increase of the loading rate, and the dissipation strain energy conversion rate is at a lower level and is negatively correlated with the loading rate. At the second stage, the dissipation strain can decrease with the increase of the loading rate, and the maximum value of the energy transformation rate of the coal-like dissipation strain occurs at the peak point or the peak rear-axle stress drop point. The dissipation strain energy conversion rate is very sensitive to the confining pressure, the larger the confining pressure, the higher the conversion rate of the dissipation strain energy, and the faster the coal-like deformation.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;贵州大学矿业学院;中国矿业大学(北京)力学与建筑工程学院;中国矿业大学(北京)煤炭资源与安全开采国家重点实验室;
【基金】：国家重点基础研究发展计划(“973”计划)项目(2010CB226801)
【分类号】：TD315

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