重庆永川煤矿煤岩热物性参数特征

Characteristics of coal and rock thermal properties in Yongchuan mine

煤岩热物性参数是矿井降温、防灭火治理工作所需要的重要基础资料.以重庆永川煤矿为研究对象,采用井下现场测定和实验室测试对该矿目前采掘区域内煤岩密度、比热、导热系数、导温系数以及原始温度、地温梯度等参数进行了测试.测试结果表明,在矿井标高–400 m 水平,煤岩样的密度、比热、导热系数、导温系数均处在正常范围之内;在标高–357- –438 m,煤岩密度、比热、导热系数、导温系数不随标高的变化而变化.在标高–400 m 水平,煤岩原始温度为35-36 ℃;矿井恒温带深度以下,–400 m 水平以上的地温梯度为2.32 ℃/hm,–400 m 水平以下的地温梯度值为2.65 ℃/hm,存在-个稍微递增的趋势,但仍然处于正常地温梯度范围.结合矿井地勘资料确定煤岩原始温度的实测值较理论计算值偏小,但误差不超过3%,精度符合工程实际要求.

Coal and rock thermal physical parameters are basic data for mine cooling fire prevention and control Coal and rock density, specific heat, heat conductivity coefficient, thermal diffusivity, original temperature, temperature gradient in present mining area of Yongchuan coal mine were measured through in situ underground measurement and laboratory tests. Results of the tests show that: at the level –400 m of coal mine, the density, specific heat, coefficient of thermal conductivity and thermal diffusivity of coal samples are within the normal range; at the level –357 m to –438 m, the thermophysical parameters, such as the coal density, specific heat, coefficient of thermal conductivity, do not change with the elevation, at the level –400 m, the original temperature of coal and rock is about 35~36℃; below the zone of constant temperature in the mine, the geothermal gradient is 2.32℃/100 m above the level –400 m and 2.65℃/100 m below the level –400 m, tends to increase slightly, but still in the range of the normal geothermal gradient. Incombination with the geological exploration data, the measured value of the original temperature of coal and rock is smaller than the theoretically calculated value, but the error is not more than 3%, so the precision meets the demands of engineering.