不同粒径配比型煤渗流特性与体积应变关系试验研究

发布时间：2018-06-28 18:55

本文选题：粒径 + 型煤　；参考：《煤矿安全》2015年03期

【摘要】：采用重庆市打通一矿K1煤层制作的不同粒径配比的型煤为研究对象,利用重庆大学自行研发的含瓦斯煤热流固耦合三轴伺服渗流装置进行试验,根据试验过程中型煤的变形形状提出了一种新的体积应变计算方法,探讨不同粒径配比型煤渗流特性与体积应变的关系。试验研究结果表明:试件渗流速度与粒径大小和粒径配比有关。粒径均匀的试件,粗粒径的渗流速度大于细粒径的渗流速度;不同粒径配比的试件,180~250μm(细粒径)含量越多渗流速度越慢;渗流速度与体积应变有较好的分段线性关系。体积应变减小阶段,各种粒径配比下的试件渗流速度均线性减小;体积反向增大阶段,180~250μm(细粒径)含量高于一定值的试件渗流速度不变,反之低于该值时渗流速度增大,但增大斜率较前面降低斜率较平缓。
[Abstract]:Taking the briquette with different particle size ratio made from K1 coal seam in Daotong Coal Mine of Chongqing as the research object, the experiment was carried out by using the gas-bearing coal heat-fluid-solid coupling three-axis servo percolation device developed by Chongqing University. According to the deformation shape of medium coal, a new calculation method of volume strain is put forward, and the relationship between seepage characteristics and volume strain of briquette with different particle sizes is discussed. The experimental results show that the percolation velocity of the specimen is related to the particle size and particle size ratio. The percolation velocity of coarse particle size is larger than that of fine particle size, the flow velocity of specimen with different particle size ratio of 180 渭 m (fine particle size) is slower, and there is a good piecewise linear relationship between seepage velocity and volume strain. At the stage of decreasing volume strain, the mean linearity of seepage velocity of specimens with various particle size ratios decreases, while the seepage velocity of specimens with 180 ~ 250 渭 m (fine particle size) content above a certain value does not change at the stage of reverse increase of volume, whereas the seepage velocity increases when the volume ratio is lower than this value. However, the slope of increasing the slope is lower than that of the front.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;重庆大学煤矿灾害动力学与控制国家重点实验室;云南驰宏锌锗股份有限公司;
【基金】：重庆大学大学生科研训练计划资助项目(121910)
【分类号】：TD712

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