Experimental Study on the Enlarged Head Pumping and Drainage Model of Static Drilling Rooted Pile

Static drilling and rooted pile is a green and environmentally friendly pile foundation construction method, which is mainly composed of PHC pipe pile and cement soil around the pile, and the expansion head treatment is added near the pile end. In order to accelerate and enhance the solidification of cement soil at the head of static drilling pile and further enhance the bearing capacity of pile foundation, the technology of vertical drainage channel and vacuum negative pressure drainage at the expanding head of pile end is proposed. Model tests were carried out to compare the bearing capacity of static drilling pile and static drilling pile with extended head pumping and drainage. The test results show that: The vacuum negative pressure drainage can accelerate the hardening of soil-cement around the enlarged head pile and make it reach the final strength earlier than the traditional static drilling pile. Vacuum negative pressure drainage consolidation strengthens the soil around the pile and the soil at the end of the pile to a certain extent. The ultimate bearing capacity of the enlarged head drainage pile at 28 days of pile formation is about 59% higher than that of the ordinary pile.