渗流作用下陷落柱温度场分布特征数值模拟

Numerical Modeling of Distribution Characteristics for Collapse Column Temperature Field Under the Action of Seepage

为了揭示渗流作用下煤矿陷落柱内部温度场的分布特征,基于多孔介质岩体渗流与传热学等理论,建立了陷落柱渗流-温度场耦合数学模型。以某煤矿II51陷落柱作为数值模拟原型,深部奥灰水为高温热源,得到了不同渗透率条件下,渗流速度与温度场在陷落柱内部空间分布特征。结果表明:随着渗透率增加,陷落柱内部渗流速度变大,使得高温异常区扩散范围也随之变大;渗流作用对陷落柱垂向上的温度场影响要强于水平方向上,同时陷落柱内部温度梯度值低于正常围岩区地温梯度值;在水平方向上距离陷落柱边界越近,温度递增现象越明显。在距陷落柱50 m范围内,温度差值可达2~8℃,由此认为通过温度来进行陷落柱的预测预报具有可行性。

To reveal the distribution characteristics of temperature field in collapse columns under the action of seepage,a coupled seepage-temperature mathematical model is established based on porous media seepage of rock mass and heat transfer theory.The space distribution characteristics of seepage velocity and temperature field in the collapse columns were investigated under different permeability by taking II5_1 collapse column as model and Ordovician limestone aquifer as heat resource.The research results indicate that the increasing permeability increases the groundwater seepage velocity,and then extends the relative high-temperature area.The seepage effect on the temperature distribution is clearer in the vertical direction than that in horizontal direction,and the temperature gradient in the collapse column is lower than that in the surrounding rock.The temperature of the surrounding rock is higher when it is closer to the collapse column.Temperature difference reaches 2 ℃ to 8 ℃ when it is in the range of 50 m away from collapse column.So it is feasible to predict collapse columns by temperature detection.