不同含水率孔周煤岩体蠕变试验及蠕变模型研究
Research on creep damage model of coal and rock mass around hole with different moisture contents
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摘要: 为探究不同含水条件下孔周煤岩体蠕变特性，制作不同含水率含孔方形试样，开展分级加载蠕变破坏试验，获取蠕变加载下试样轴向应变曲线；同时基于改进西原模型，引入含水煤岩体蠕变损伤变量Dw和时效损伤变量Dt，建立不同含水率孔周煤岩体蠕变模型；对比分析试验结果和模型计算值，验证蠕变模型合理性。研究结果表明：同一加载应力水平下，所有试样进入稳定蠕变阶段的时间均在1 h左右，但干燥试样轴向应变量较小，到达加速蠕变阶段的时间也较高，表明水对煤岩体具有物理侵蚀和软化作用；所建蠕变模型参数与含水率之间呈指数关系，且模型理论曲线与试验数据曲线有较好的吻合性。Abstract: In order to explore the influence of water on the creep characteristics of coal and rock mass around the holes, the square samples with holes and different moisture contents were prepared, and the staged loading creep failure test was carried out to obtain the creep curves during the creep loading process of the samples; based on the improved Nishihara model, the damage variable Dw and the aging damage variable Dt two factors are introduced to establish the creep model of coal and rock mass around the hole under different water content conditions; the rationality of creep model was verified by comparing the test results with the calculated values of the model. The research results show that under the same stress level, the time for all samples to enter the stable creep stage is about 1 hour, but the axial strain of the dry sample is small, and the time to reach the accelerated creep stage is also higher, indicating that water has physical erosion and softening effect on coal and rock mass. There is an exponential correlation between the established creep model parameters and the water content. The theoretical curve of the model is in good agreement with the experimental data curve.
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Keywords:
- water content /
- coal and rock mass /
- creep test /
- improved Nishihara model /
- creep model
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