About the author:

1.Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University,Shanghai 200092, China; 3.Shanghai Yuan Feng Underground Engineering Co., Ltd., Shanghai 201015, China;4. East China Architecture Design & Research Institute Co., Ltd., Shanghai 200011, China; 5.Shanghai EngineeringResearch Center of Safety Control for Facilities Adjacent to Deep Excavations, Shanghai 200011, China

Abstract:

Aiming at the problems of low digitization and uncontrollable construction disturbance oftraditional mixing piles, a digital micro⁃disturbance soil mixing pile （DMP method）was developed andsuccessfully applied in the fourth phase project of Shanghai Pudong Airport. The results indicate that theDMP method can achieve a small disturbance to the surrounding environment during the constructionprocess by configuring multi⁃channel special⁃shaped drill pipe, differential blade, and ground pressuremonitoring system. And the measured settlement of the MRT maintenance base is only 1 —— 2mm. Thedigital construction control system ensures that the equipment is automatically constructed according to theinput design parameters and the construction process is displayed in the cloud. The apparent quality ofthe pile after excavation is obviously better than that of the three⁃axis mixing pile, and the strength anduniformity of the pile core sample are better. The research results have practical significance forimproving the construction quality and construction digitization of mixing piles.