人工挖孔桩扩底具有单桩承载力较大,施工速度快,简单直观和经济效益好等特点,但也存在一些明显的弱点,尤其当场地内地下水丰富时,易形成流泥、流砂,甚至坍塌,而且施工处理非常困难。我公司在福州某综合楼的人工挖扎桩扩底施工中,持力层出现流砂、 The excavation of manual digging piles has the characteristics of large pile bearing capacity, fast construction speed, simple and intuitive and good economic benefits, but there are also some obvious weaknesses, especially when the groundwater is rich in the site, it is easy to form flow mud, quick sand, and even Collapse, and the construction process is very difficult. In the construction of artificial digging piles in a comprehensive building in Fuzhou, the company developed quicksand,