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在取水工程中,采用管井作为取水设备是非常普遍的,因此正确地选择过滤器的尺寸,具有重要的意义。对于管井过滤器尺寸的计算,长期以来沿用C.K.阿勃拉典夫公式[1][2]进行: t≥Q/(πDV允),D≥Q/(πlV允) (1) 式中:l—过滤器长度,米; D—过滤器外径,米; Q—管井涌水量,米~3/昼夜; V允—含水层允许渗透速度,米/昼夜; V允=65 K~(1/3) (2) K—含水层渗透系数, 米/昼夜。但是,多年来的实践表明;根据式(2)的V允值计算得到的l(或D)值,往往过短(或过小)。特别是在透水性弱的细粉砂(K=1～5)和中砂(K=5～15)含水层中,这
In the water intake project, it is very common to use tube wells as the water intake equipment. Therefore, the correct selection of the size of the filter is of great significance. For the calculation of tube well filter size, the CK Ablat formula was used for a long time [1][2]: t≥Q/(πDV allowed), D≥Q/(πlVallowed) (1) Where: l— Filter length, meter; D-filter outer diameter, meter; Q—water flow from tube well, meter~3/day/night; V Yun—allowed aquifer penetration rate, meter/day/night; Vallow=65 K~(1/3 (2) K—aquifer permeability coefficient, m/day. However, practice over the years has shown that the value of l (or D) calculated from the V equivalence of equation (2) is often too short (or too small). Especially in aquifers with weak permeability (K=1～5) and medium sand (K=5～15), this is