三都矿区地温分布规律

Research on geothermal distribution of Sandu coal field

通过现场实测地温数据,分析了三都矿区地温场、地温梯度分布特征以及影响矿区地温分布的因素.研究发现:地温随煤层的埋深增加而增加,三都矿区的地温梯度值在正常范围内,井田-420^-650 m水平为一级热害区,二级热害区分布在-650 m水平以下,地质构造是影响地温分布的主因.低于原始岩温的地下水,渗流速度对岩壁的温度场的影响是随着渗流速度的增加,壁面温度降低,但当渗流速度大于约0.7×10^(-5)m/s时壁面温度保持恒定.研究为三都矿区的深部开采过程中,对地温的预测以及热害防治工作提供了参考.

According to the data obtained by field measurements,this paper analyzes the geothermal field distribution,the characteristic of geothermal gradient,and the factors affecting geothermal distribution in Sandu coal field. Results show that geothermal increases with the depth of coal. Geothermal gradient of Sandu mine is within the normal limits,and the coal field between- 420 m and- 650 m altitude belongs to thermal damage category I,and the thermal damage category II was under- 650 m. The main factors affecting the distribution of geothermal are geological factors. When the temperature of groundwater is lower than that of original rock,the groundwater seepage velocity has influence on the temperature of the tunnel wall,i. e the flow rate increases,the temperature of tunnel wall decreases. However,when the seepage velocity is greater than 0. 7 × 10- 5m / s,the wall temperature is kept constant. This paper has provided both the forecast for the ground temperature and the references for heat injury prevention in Sandu coal field.