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一、问题的提出适当加大缝式滤水管的缝隙宽度,不仅提高孔隙率,而且对减小缝隙堵塞、积垢和产生过大的水头损失具有重要意义。在中砂以上地层不围填滤料情况下缝宽t的设计已有标准可循。最常使用的缝宽计算公式为:含水层颗粒均匀时,t=(1.25-1.5)D_(50);含水层颗粒不均匀时,t=(1.5—1.0)D_(50)。而在围填滤料的情况下,缝式滤水管的缝宽设计至今还没有正规标准可依。在这种情况下若沿用填砾缠丝过滤器间隙的规范标准(表
First, the problem proposed to increase the gap width of the slit filter pipe, not only improve the porosity, but also to reduce the gap plugging, fouling and produce excessive head loss is of great significance. The design of the slit width t in the case where the medium-sand-above stratum is not surrounded by the filter material has already been followed. The most commonly used formula for calculating the slit width is: when the aquifer particles are uniform, t=(1.25-1.5)D_(50); when the aquifer particles are not uniform, t=(1.5-1.0)D_(50). In the case of filling the filter material, there is no formal standard for the width of the slit filter. In this case, if the grit filter gap is used, the gap standard specification (table