基础工程中为提高土层承载力,方便施工，有必要降低地下水位,故选用一种好的排水系统十分重要。过去,经常采用带孔的钢管来作排水管。由于它抗腐蚀性能差,重量大,且开孔率小,已被普通带孔的塑料管代替,但这种塑料管耐久性差、脆性大,开孔率一般仅为１%～２%,排水效果并不显著。 In order to increase the bearing capacity of the soil and facilitate the construction in the foundation project, it is necessary to reduce the groundwater level. Therefore, it is very important to choose a good drainage system. In the past, steel pipes with holes were often used as drainage pipes. Because of its poor corrosion resistance, heavy weight, and low open porosity, it has been replaced by ordinary plastic pipes with holes, but this plastic pipe has poor durability and brittleness, and the opening rate is generally only 1% to 2%. The effect is not significant.