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前言暗管排水引起地下水位降落的传统计算方法、通常假定暗管为完全渗透且地下水进入暗管没有阻力。然而暗管管壁因孔眼有限使进水量减少,这点早已被人们所认识。Kirkhan和Schwab(文献5、7、10)两人曾实验分析过暗管的排水作用,他们的理论和电拟试验结果证明。不论粘土管接缝渗水或管周渗水,其渗水率一般要比多孔管减少50％。Dennis和Fraffora(文献2)分析了在稳定降雨条件下各种形式的砾石反滤层的进水效果,他们的结论是:在排水管周围铺一层薄薄的砾石来降低暗管附近的水流阻力,可使排水管的间距增
Foreword The traditional method of calculation of groundwater level drop caused by draining of underground pipes usually assumes that the underground pipe is completely infiltrated and there is no resistance to groundwater entering the underground pipe. However, it has long been known that the dark pipe wall has a reduced amount of water due to the limited aperture. Kirkhan and Schwab (literature 5,7,10) have experimentally analyzed the draining effect of the pipe, and their theoretical and electrical test results prove it. Regardless of the seepage of the joints of the clay pipes or the seepage of the pipes, the water seepage rate is generally reduced by 50% compared with the porous pipes. Dennis and Fraffora (Ref. 2) analyzed the influent effects of various forms of gravel infiltrating layers under steady rainfall conditions. They concluded that a thin layer of gravel was placed around the drains to reduce the flow of water near the tubes. Resistance can increase the distance between drains