深部矿井巷道围岩与风流温度场数值模拟

发布时间：2018-07-28 12:15

【摘要】：随着矿井开采的不断延伸，井巷围岩放热成为矿井热害的主导因素。深部岩体富含大量空隙，当有地下水渗流时，会改变岩体温度场分布，进而影响巷道内风流温度场，影响井下工作环境。因此，地下水渗流作用下的巷道围岩与巷道内风流温度场研究，对进一步揭示深部矿井流热耦合作用机理，合理有效的利用矿井降温技术及开发地热资源有重要的理论价值及现实意义。 本文在国内外岩体渗流及矿井热环境研究的基础上，，应用传热学、流体力学、水文地质学等理论，对地下水渗流作用下深部巷道围岩温度场及巷道内风流热环境进行了数值研究。理论分析了岩体渗流模型及规律，推导了地下水流场、温度场及其渗流作用下深井巷道围岩温度场、巷道风流流场及温湿场数学模型，确定其影响因素；采用FLUENT软件研究了不同渗流速度和渗流温度作用下巷道围岩温度场分布；进而对工程现场条件下的周源山煤矿-800m北大巷风流温度场进行了数值模拟，研究了不同送风参数（送风量、送风温度、送风相对湿度）对掘进巷道热环境的影响。 研究表明：地下水渗流改变了巷道围岩温度场的分布形式，使其由对称分布变为非对称分布。地下水渗流速度、温度均对围岩温度场分布有着重要影响，当流速小于2×10-8m/s时，对巷道围岩温度场的影响是微小的。伴随着送风量增大，巷道内空气温度降低，相对湿度及其在回风方向上的增减梯度减小；当送风量达到7m3/s后继续增大，巷道内风流均温变化很小，增大送风量的降温效果有限。送风温度降低，巷道内空气温度随之降低，风流温度在回风路径上的递增幅度逐渐增大，空气相对湿度呈现先增后降趋势。送风相对湿度降低，巷道内风流温度基本保持不变，而空气相对湿度明显降低。确定了适宜的送风参数为：送风量为7m3/s，送风温度为24℃，送风湿度为50%。
[Abstract]:With the continuous extension of mine mining, the heat release of surrounding rock becomes the dominant factor of thermal damage. The deep rock mass is rich in a large number of voids, when there is groundwater seepage, it will change the distribution of rock mass temperature field, and then affect the temperature field of air flow in the roadway and the underground working environment. Therefore, the study on the temperature field of surrounding rock and air flow in roadway under the action of groundwater seepage will further reveal the mechanism of fluid-heat coupling in deep mine. Reasonable and effective use of mine cooling technology and exploitation of geothermal resources have important theoretical and practical significance. Based on the study of rock mass seepage and mine thermal environment at home and abroad, the theories of heat transfer, hydrodynamics, hydrogeology and so on are applied in this paper. The temperature field of surrounding rock of deep roadway and the thermal environment of wind flow in roadway under the action of groundwater seepage are studied numerically. The seepage model and law of rock mass are analyzed theoretically, and the mathematical models of surrounding rock temperature field, wind flow field and temperature moisture field of deep well roadway under the action of underground flow field, temperature field and seepage flow are deduced, and the influencing factors are determined. The temperature field distribution of roadway surrounding rock under different seepage velocity and percolation temperature is studied by using FLUENT software, and the temperature field of wind flow in Zhouyuanshan Coal Mine -800m North roadway under the condition of engineering site is numerically simulated. The influence of different air supply parameters (air supply rate, air supply temperature, air supply relative humidity) on the thermal environment of tunneling roadway is studied. The results show that the distribution of temperature field in surrounding rock of roadway is changed from symmetrical distribution to asymmetric distribution by groundwater seepage. The velocity and temperature of groundwater seepage have an important influence on the temperature field distribution of surrounding rock. When the velocity of flow is less than 2 脳 10-8m/s, the influence on the temperature field of roadway surrounding rock is small. With the increase of air supply rate, the air temperature in the tunnel decreases, the relative humidity and its gradient decrease in the direction of return air, and when the air supply volume reaches 7m3/s, the average temperature of the air flow in the tunnel changes little, and the cooling effect of increasing the air supply rate is limited. With the decrease of air supply temperature, the air temperature in roadway decreases, the increasing amplitude of air flow temperature in the return air path increases gradually, and the relative humidity of air increases first and then decreases. The relative humidity of air supply decreases, the air flow temperature in the tunnel remains unchanged, and the relative humidity of air decreases obviously. The suitable air supply parameters are determined as follows: air supply volume is 7 m3 / s, air supply temperature is 24 鈩

本文编号：2150109