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一、各种防渗处理方法及其适用性(一)截水槽从地基表面穿过砂砾层一直挖到基岩或不透水层,同填以防渗材料而成。一般截水槽所用填料多与壩体防渗材料相同,通常多用渗透系数小于i×10~(-5)的粘性土料,其有机质含量不大于1％,易溶盐含量不大于3％。基岩相当深的砂砾地基,一般习用一道截水槽,它的位置筑于离壩轴较上游的地方,糟之中心线平行于壩轴,横越谷底。在近壩墩处渐向壩轴线靠拢,以维持其上复盖土料的厚度。基岩或不透水层比较接近壩体底面时,常用二
First, all kinds of anti-seepage treatment methods and their applicability (A) cut off from the surface of the ground through the gravel layer has been dug into the bedrock or impermeable layer, filled with impermeable material. Generally, the packing used in the water cutoff is mostly the same as the seepage control material of the dam. Usually, the clay with the permeability coefficient less than i × 10 -5 is used. The content of organic matter is not more than 1% and the soluble salt content is not more than 3%. Basalt quite deep grit foundation, generally use a cutoff trough, its location is built in the upper part of the dam axis, bad centerline parallel to the dam axis, across the valley. Near the dam pier gradually closer to the dam axis, in order to maintain the thickness of the soil cover material. Bedrock or impermeable layer closer to the bottom of the dam, the commonly used two