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《Journal of Soil and Water Conservation》 2017-04
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Water Redistribution and Gas-Heat Diffusion of Reconstruction Soil Filled with Gangue

WANG Shun;CHEN Min;CHEN Xiaoyang;CHEN Qinghua;LIU Benle;HU Zhiyong;School of Earth and Environment,Anhui University of Science and Technology;Engineering and Technology Research Center on Coal Exploration of Anhui;College of Mechanical Engineering,Anhui University of Science and Technology;  
In order to characterize water redistribution and gas-heat diffusion of reconstruction soil filled with gangue in coal mining areas,guide engineering design and rebuild soil ripening technology,a simulator was designed in laboratory.Soil water content,temperature and soil CO_2 concentration could be constantly measured by laid sensors and detectors in different depth of soil column.The results showed that soil water infiltration process was slowed down and the water-holding capacity of the upper soil was increased because of good water resistance from coal gangue layer.However,the water content of coal gangue layer was significantly lower,approximately 10%,than that of topsoil due to the poor water-holding capacity of gangue.Coal gangue had higher thermal diffusivity,higher temperature than that of topsoil with heating,could form sustainable temperature gradient and temperature difference with topsoil layer in reconstruction soil.The effects of heated from below on topsoil was small,which it was mainly influenced from indoor temperature in the short run.In addition,the temperature changing curve of topsoil is similar with the temperature of laboratory and its biggest fluctuation range was for 2.89℃.The effects of aerating CO_2 from column bottom on CO_2 concentration of topsoil soil was also very small,because gas transport from coal gangue layers to soil ones would easily be cut off as so to gas accumulated in the soil layer below.The coal gangue could have a negative impact on microbial living environment to adjacent topsoil layers and declined microorganism activities.The effects of coal gangue on topsoil layer were brought down when the cover soilthickness was 60 cm.The influences gradually would be weakened with the thickness increased.
【Key Words】: reconstruction soil coal gangue temperature gradient gas diffusion soil infiltration
【Fund】: 国家自然科学基金项目(41572333 51274013 41402309)
【CateGory Index】: S152.7
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