冻结褐色泥岩非线性加速蠕变西原模型优化
发布时间:2019-06-19 17:53
【摘要】:为研究冻结褐色泥岩加速蠕变特性,以陕西某煤矿主井井筒褐色泥岩为研究对象,基于不同的轴压水平,采用WDT-100冻土试验机分别在-5,-10,-15℃的负温条件下进行了单轴等载荷蠕变试验。试验结果表明:低轴压水平下的冻结褐色泥岩蠕变呈现出瞬时弹性、减速、稳定3阶段特性,高轴压水平呈现出瞬时弹性、减速、等速、加速4阶段特性,轴压水平因素对冻结褐色泥岩轴向应变增加的影响程度远大于温度因素。基于经典西原模型,串联一个带应变启动的非线性黏滞阻尼器,得到7元件优化西原模型,通过最小二乘法对模型参数进行非线性回归分析,分析结果表明,7元件优化西原模型拟合曲线与试验结果吻合良好,更适合于描述冻结褐色泥岩非线性加速蠕变特性的变化规律,对深井煤矿冻结褐色泥岩的蠕变破坏预报具有参考价值。
[Abstract]:In order to study the accelerated creep characteristics of frozen brown mudstone, the uniaxial equal load creep test was carried out on the main shaft of a coal mine in Shaanxi Province under the condition of negative temperature of-5, 鈮,
本文编号:2502536
[Abstract]:In order to study the accelerated creep characteristics of frozen brown mudstone, the uniaxial equal load creep test was carried out on the main shaft of a coal mine in Shaanxi Province under the condition of negative temperature of-5, 鈮,
本文编号:2502536
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