目前,一般采用砂井法来加速排水,提高软土地基的承载力。施工时先打出井孔,然后往井孔内填砂筑成砂井。关于打井孔的方法,铁道部第四勘测设计院是采用射水法施工,将高压水通过射水管后,形成高压水束冲击软土,同时利用射水管上的环刀配合切削形成井孔。施工时,将机械安装在平板车上,平板车在铺设的轨道上移动逐孔施工。但是,采用这种方 At present, sand and sand method is generally used to accelerate drainage and improve the bearing capacity of soft ground. When construction first hit the hole, and then sand into the well into the sand well. As for the method of drilling boreholes, the Fourth Survey and Design Institute of the Ministry of Railways adopts the water-jetting method to construct a high-pressure water jet impacting soft soil by passing high-pressure water through a water-jet pipe, and at the same time, a circular knife on a water-jet pipe is used to cut and form a well hole. Construction, the mechanical installation in the flatbed truck, flatbed truck in the laying of the track moving hole construction. However, the use of such parties