分级加载速率对无烟煤蠕变特性的影响规律试验研究
Experimental study on effect of graded loading rate on creep characteristics of anthracite
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摘要: 为研究分级加载速率对无烟煤蠕变特性的影响规律，通过进行4种不同分级加载速率下无烟煤三轴蠕变试验，分析了分级加载速率和应力水平对煤样瞬时应变、蠕变应变及蠕变速率的影响规律。结果表明：在同级应力水平下，分级加载速率越大，瞬时应变越小，蠕变应变越大，但蠕变应变的增加趋势逐渐放缓；分级加载速率相同时，随着应力水平的提高，煤样瞬时应变表现为快速减小—缓慢减小—增加的整体减小趋势，而煤样蠕变应变则表现为基本不变—缓慢增加—快速增加的整体增大趋势；蠕变速率的变化过程可分为急速衰减、缓慢衰减和稳定3个阶段，同级应力水平下，分级加载速率越大，最大蠕变速率越大，蠕变速率衰减越快。Abstract: In order to study the effect of graded loading rate on creep characteristics of anthracite, the effects of graded loading rate and stress level on instantaneous strain, creep strain and creep rate of coal samples were analyzed by triaxial creep tests of anthracite under four different graded loading rates. The results show that at the same stress level, the higher the graded loading rate is, the smaller the instantaneous strain is and the larger the creep strain is, but the increasing trend of creep strain gradually slows down; at the same loading rate, with the increase of the creep stress level, the instantaneous strain of coal samples shows an overall decreasing trend of rapidly decreasing-slowly decreasing-increasing, while the creep strain of coal samples shows an overall increasing trend of basically unchanged-slowly increasing-rapidly increasing; the change process of creep rate can be divided into three stages: rapid decay, slow decay and stability, at the same stress level, the higher the graded loading rate is, the higher the maximum creep rate is, and the faster the creep rate decays.
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Keywords:
- graded loading rate /
- anthracite /
- creep /
- instantaneous strain /
- creep strain /
- creep rate
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