Research On Gangue Roadbed Impact On Groundwater

China is the largest producer and consumer of coal in the word. According to thestatistics of relevant departments, gangue has been stocked about45tons in theaggregate at present, and outputted of3tons every year, there are2tons coal ganguecan be used for power generation. coal gangue stacking is not only a waste of nationalresources, but also a waste of a lot of land, and it always cause the pollution ofenvironment. Using coal gangue as roadbed filler can not only solve the expresswayland soil difficulties, but also consume a large number of coal gangue as accumulation.The enormous economic benefits, environmental benefits and social benefits areproduced, but the harmful substances in coal gangue may lead to pollution ofgroundwater seepage, which affect human health. As people’s environmentalprotection consciousness inceasing gradually, the use of coal gangue is being alsomore and more attentioned. The surface water, groundwater and soil is polluted bywater leaching of coal gangue. It is one of the main problems of environmentalpollution. Through a long-term weathering and leaching of rainfall, a series ofphysical and chemical reactions is produced by coal gangue; a lot of soluble inorganicsalts and heavy metals is leached into groundwater and farmland, which will bring theserious influence to of nearby residents.According to xingfen highway, there is a analysis of the influence of coal ganguehighway on underground environment. First of all, An immersion test is made. It isused to study the changes of heavy metal and inorganic salt in coal gangue under theaction of underground water. And change characteristics of different pollutants indifferent stages of immersion. In prophase, the increasing speed of heavy metals andinorganic salts concentration is quite high; In the middle of the soaking, the change ofheavy metal element concentration is unstable, mainly because of the physical andchemical role in coal gangue; Later there will be a peak concentration.Secondly,leaching experiment, is used to simulate to observe the degree of pollution for theinfluence of pollution,s degree, which caused by the different heavy metals andinorganic salt. As can be seen from the leaching test, the change rate of Cr, Fe andsulfate is rapid; and the variation of Cu, As, chloride, nitrate fast first and then slowly; the concentration of Mn and Zn is a rise change but not stable.Thirdly, the software model for was built Xingfen highway to do numericalanalysis; Through the analysis, we know that the underground environment is pollutedby the coal gangue highway when rain, it will fall after rising fllowing the time.Solute contaminants can constantly moving downward in the surface layer soil frompollution. In the process of movement, with the increase of soil depth, theconcentration of the peak is gradually reduced. In profile pollution zone, pollutionconcentration is larger in the middle, the solute concentration distribution is thepresent state of normal distribution.Finally, by collecting two ground water samplesalong the highway, heavy metals and inorganic salt content is detected and analyzed.This analysis can be used to study the impact on actual groundwater quality. And itcan be used to study the relation of time factor on the pollution degree of influencethrough comparing the results of water under the coal gangue hillock.