| Daqiang mine located in Shenyang City,Liaoning Province,Zhang Qiang Town, Yikeshu Village South, Kangping County.Monoclinic construction for coal layer,tilt from north to south,5°~15°for angle of dip,350m~1400m for depth, mine water inflow volume is 201.88m3/h,maximum volume of water inflow is 416.33m3/h,the temperature at coal seams is 17~58℃,average temperature is 35.39℃,northern well field belongs to normal areas of ground temperature,high-temperature areas of ground temperature in the southern part,Average geothermal gradient in northern well field value is 2.6℃/100m,the average geothermal gradient in the southern is 3.42℃/100m.Daqiang mine belongs to a typical mine which is more seriously damaged by high-temperature harm,as a result of complexity of the underground environment,to illustrate the problem,this paper started from a simple analysis of two fields,with the case of number xin-9 tunnel of Daqiang mine,by numerical simulation method,we conducted a multi-field coupling numerical analysis surrounding Daqiang mine thermal damage zone of deed tunnel's temperature field,and obtained the temperature distribution on surrounding rock under different coupling conditions,we also conduct a preliminary analysis about the mechanism of interaction between each field under different coupling conditions,to take appropriate cooling measures to provide some reference,the main research content and relevant conclusions are as follows:With the combination of Fluid mechanics,Heat transfer and Rock Mechanics,according to conservation of mass, linear momentum balance and the energy conservation law,and we respectively established heat conduction equation of tunnel surrounding rock under stress,seepage-temperature coupling mathematical model of tunnel surrounding rock,tress-seepage-temperature mathematical model of three coupled surrounding deep tunnel rock, And by finite element software,we conducted numerical simulation of temperature field surrounding deep tunnel rock under different coupling conditions,the results from the two coupling terms,if we only consider the impact of stress,stress has little effect on the temperature distribution,but temperature has the more obvious impact on stress,temperature field and stress field is essentially a one-way coupling,coupling probleme can be reduced to thermal stress problems;If we only consider the impact of seepage,as the presence of groundwater seepage,groundwater as the carrier of heat transfer will involve in the heat transfer process of rock system,the temperature of groundwater is generally lower than the temperature of the rock,In the process of groundwater seepage,the heat will be passed from rock to groundwater in the way of heat convection ,the temperature of groundwater gradually increased along the flow direction,similar to the temperature of the rock finally,the formation of heat exchange balance area,this indicates that seepage associated with the heat transfer.By the comparison of temperature distribution of surrounding deep tunnel rock under the conductions of two fields coupling and three fields coupling,in addition to the respective impact of stress and seepage on the temperature field,the coupling effect of stress field and seepage field will also affect the temperature distribution,this is because the stress will affect the fluid flow and aggregation,groundwater flow will in turn generate penetration effect of rock matrix,groundwater seepage at the same time along with heat and mass transfer.the three effects mentioned above occur simultaneously,in addition,for the presence of groundwater seepage in rock system,either for two fields coupling or three fields coupling,groundwater is all a "carrier" of heat transfer ,It is because of the presence of groundwater seepage,which makes the heat transfer process to run smoothly... |
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