土壩是就地取材的建筑物?髦蔚氐愦蠖純Σ刈磐翂尾牧?但是不一定所有的土料都适於筑壩,因此选擇土壩材料是設計土壩时的一个重要步驟。虽然只要土壤中不含有大量有机混合物和水溶性鹽类,任何土壤都可用以筑壩,但是由於要把不同性質的土壤配置在壩的不同部位,例如,透水性大的土壤不适於做防滲材料;粘土含量太大的土壤不适於放在壩的坡面上;細砂粉砂用來筑壩需达到一定的技術 However, not all of the soil is suitable for damming, so the choice of earth dam material is one of the time when designing the earth dam Important steps. Although any soil can be used to dam as long as the soil does not contain a large amount of organic mixture and water-soluble salt, it is not suitable for seepage prevention because different soil types are arranged in different parts of the dam, for example, Material; soil with too much clay content is not suitable for placement on the slope of the dam; sand and silt used to dam certain techniques to be achieved