Experimental Research on Long Spiral Drilling Pressure Grouting Pile of a Project in Xi’an

The commonly used technology of bored piles in sand and pebble fields is mud protection wall rotary excavation or reverse circulation drilling technology. This type of drilling technology requires a large amount of mud and high-quality control, which is prone to quality problems such as collapse and excessive sludge, resulting in single pile bearing capacity not meeting the design requirements. The long spiral drilling and pressure grouting pile technology have no slurry cake and sediment, greatly improving the quality of the pile and the bearing capacity of a single pile. However, for ultra-long piles, the full-length steel cage cannot be used in this progress, which to some extent limits the use of this technology. Based on the experimental research of the Xi'an Olympic Sports Center project, the reinforcement of the entire length was changed to 2/3 of the pile length and not exceeding 25 meters, guaranteeing the use of this method in the project.