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火电厂每年都产生大量粉煤灰,这些粉煤灰除少部分被综合利用外,大部分都贮放于灰场或用于工程回填。由于粉煤灰中含有有害元素,当粉煤灰与水接触后,灰中有害元素溶出并通过渗透扩散。在估算有害离子扩散范围及扩散量时,渗透系数是比较关键的参数之一,渗透系数选取的正确与否直接影响分析成果的合理性。目前,在进行灰场地下水污染分析时,采用的渗透系数一般为常规的短期渗透系数,不考虑渗透系数随时间变化的性质。
Thermal power plants generate large amounts of fly ash every year. Most of these fly ash are stored in the ash yard or used for engineering backfilling, except for a few of them. Because fly ash contains harmful elements, when the fly ash comes into contact with water, harmful elements in the ash dissolve out and diffuse through the infiltration. When estimating the diffusion range and diffusion amount of harmful ions, the permeability coefficient is one of the more critical parameters. The correctness of the selection of the permeability coefficient directly affects the rationality of the analysis results. At present, in the analysis of ash field groundwater pollution, the adopted permeability coefficient is generally the conventional short-term permeability coefficient, and does not consider the nature of the permeability coefficient change with time.