过去在改良软弱地基采用砂桩时,存在着砂桩直径大,用砂量多,易产生瓶颈和剪断等缺点。 日本最近采用了一种化学纤维(聚乙烯)网管中填砂的新施工方法,其特点是: (1)在比较坚韧的网管中填砂做排水管,使砂桩不会剪断,可以维持连续排水 In the past, when sand piles were used to improve soft ground, there were disadvantages such as large diameter of sand piles, large amount of sand, and bottlenecks and shearing. Japan recently adopted a new construction method for sand filling in a chemical fiber (polyethylene) network pipe, which is characterized by: (1) Filling sand in relatively tough network pipes as drainage pipes so that the sand piles will not be sheared and can be maintained continuously drain