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在采动影响下,采场冒落带内碎岩和遗煤呈现出初始冒落到不断被压实的非均质状况。为了更准确地模拟采场流动换热状况,本文将孔隙率和渗透率视为在二维空间内不均匀分布的连续变量,并建立相应的计算模型。基于多孔介质流动传热模型对典型U型采场流场与温度场进行数值模拟和实测对比。通过给出不同孔隙率模型下的计算结果,表明采空区冒落带的孔隙率分布模型对采场内流动传热模拟结果有较大影响。采用冒落带孔隙率二维连续非均匀模型后,工作面采空区侧的各点温度模拟与实测值相差<0.5℃,因而其结果更符合实际。
Under the influence of mining, the rock fragments and coal left in the caving area of the stope showed the initial caving to the continuously compacted heterogeneous condition. In order to more accurately simulate the convective heat transfer in stope, porosity and permeability are regarded as continuous variables which are unevenly distributed in two-dimensional space and a corresponding calculation model is established. Numerical simulation and comparison of flow field and temperature field in a typical U - shaped stope based on the porous medium flow heat transfer model. Through the calculation results under different porosity models, it is shown that the porosity distribution model of caving zone has a great influence on the simulation results of the flow and heat transfer in the stope. After adopting two-dimensional continuous non-uniform model of the porosity of caving zone, the simulation of temperature at each point on the side of the working face differs from the measured value by 0.5 ℃, so the result is more realistic.