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根据試坑注水实驗的資料計算未飽水砂土及亞砂土的渗透系数,对水工建筑物和灌溉渠道的設計具有重要的意义。然而在实踐中通常采用的方法,由于过分簡化了实际滲流情况以及运用了简单的水力学方法,因而計算的結果与实际情形相差很远:如鮑尔迭列夫方法沒有考虑水向兩侧的溢流,因而根据該方法計算大顆粒砂土的滲透系数所造成的誤差大概等于300%;湼斯捷諾夫方法沒有考虑滲透水流中間部分的扩張;而捷里索夫方法沒有根据水流
Calculating the permeability coefficient of unsaturated soil and sub-soil according to the data of experimental injection, which is of great significance to the design of hydraulic structures and irrigation channels. However, the commonly used method in practice, due to over simplification of the actual seepage situation and the use of a simple method of hydraulics, the calculation results far from the actual situation: If the Baldrev method does not consider the water to both sides The error caused by the calculation of the permeability coefficient of the macroparticle sand by this method is approximately equal to 300%; the Nesteinoff method does not take into account the expansion of the middle part of the permeate stream; and the method of the Terrysov method does not consider the water flow