Numerical Simulation Of Temperature Field Of Surrounding Rock And Airflow In Deep Mine

With the increase in mining depth, exothermic surrounding rock hasbecome the dominant factor of mine heat harm. There are a large number ofinterspaces in deep rock mass; groundwater seepage will influence thedistribution of temperature field of surrounding rock and airflow, whichinfluence work environment underground. Therefore, the research of bothsurrounding rock and airflow temperature field under seepage has importanttheoretical value and realistic significance to further reveal coupling effect offluid-heat in deep mine, and reasonably develop new mine cooling technologyand geothermal resources.The surrounding rock temperature field and airflow thermal environmentunder the influence of groundwater seepage are numerically investigatedbased on the research of rock seepage and thermal environment of mine inhome and abroad, and through the application of heat transfer, fluidmechanics, hydrology geology and other disciplines theory knowledge. First,the model and rules of the rock mass seepage are analyzed theoretically. Themathematical model of surrounding rock temperature field and roadway flowfield and temperature and humidity field under the influence of groundwaterflow field and temperature field and their seepage is deduced in detail. Thenthe rock mass temperature fields under the influence of different velocity anddifferent temperature of groundwater seepage are simulated by using FLUENTsoftware. Finally, the airflow temperature and humidity fields of North Laneof800m deep in Zhouyuanshan coal mine are simulated under actualconditions and the effect of different air supply parameters (air volume, airtemperature, air relative humidity) on tunnel thermal environment isnumerically studied.The research shows that: the groundwater seepage changes thedistribution of temperature field of surrounding rock from symmetricdistribution to asymmetric distribution; the velocity and temperature ofgroundwater seepage has an important influence on the temperature field of surrounding rock; when the flow rate is less than2×10-8m/s, its influence onthe temperature field of surrounding rock is small; the air temperature in thetunnel reduces as the air volume increases, and the relative humidity and itschange gradient in return air direction decrease; but when the air supplyvolume reaches more than7m3/s, the average temperature change of the tunnelairflow is very small and the cooling effect of increasing air flow is limited;the tunnel airflow temperature decreases with the air temperature reducing;the increasing range of air temperature in the return air path increasesgradually; the relative humidity of tunnel air increases first then decreases.When the relative humidity of air decreases, the airflow temperature of tunnelchanges little basically, and air relative humidity decreases. Thus, the suitableair supply parameters are determined: the air supply volume is7m3/s, the airtemperature is24℃, the air humidity is50%.