深部矿井煤岩体温度场特征及其控制因素研究

Research on Coal and Rock Mass Temperature Fields Characteristics and Control Factors in Deep Mine

为给深部矿井热害防治提供科学的依据,分析了深部矿井煤岩体温度场的特征及其控制因素,研究了渗流场与温度场间相互作用机理,数值模拟了岩体热物理性质及裂隙网络几何参数对温度场的控制特征。结果表明:热导率低的岩层中地温梯度较大;岩体裂隙中水流温度变化随对流换热系数的增加而增加,当对流换热系数大于500 W/(m2·K)时,对流换热系数对水流温度影响不明显;当渗透率远小于10-14m2或裂隙宽度远小于0.000 1m时,深部岩体渗流场对温度场的影响较小。

In order to provide scientific basis for the prevention of heat harm problem in deep mine, the characteristics and major factors affected to temperature fields were analyzed.The interaction mechanism between the flow field and temperature field of deep coal and rock mass was studied.The rock thermo physical properties and the control action of temperature fields on the fracture network geometry parameters were numerical simulated.The results showed that geothermal gradient was higher in the strata with lower thermal conductivity.The fis- sure water temperature would be greater with the convective heat transfer coefficients increased. The convective heat transfer coefficients would have no significant effects on the water temperature when it was greater than 500 W/（ m2· K） .The deep rock mass seepage field would have little effects on the temperature field when the permeability was far lower than 10-14 m2 or the facture width was far lower than 0. 000 1 m.