By using this model the soil-water characteristics and permeability coefficient of unsaturated soil are deduced and expressed in fractal dimension and air-entry value.
本文建立了土体孔隙分布的分形模型，导出用分维和进气值表示的水分特征曲线和渗透系数的理论表达式。
Permeability is a key factor to air leakage, its value and distribution influences greatly the distribution of air leakage. The mechanized support influence air leakage from working face to gob.
渗透率是解算采空区流场的关键参数，渗透率的变化对采空区的流场有很大的影响，而综采支架的存在，影响工作面向采空区的漏风。
For optimized fly ashes, specific surface value determined by air permeability method is more desirable than fineness value by sieve analys...
对于优化粉煤灰，用透气法测定其比表面积比用筛析法测定的细度，更适宜于表征粉煤灰的品质。
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