Site Measurement Study on Mechanical Properties of SMW Piles of Building Structures in Sandy Soil Areas

SMW (soil mixing wall) piles have been widely used in soft soil areas such as Jiangsu, Shanghai, Tianjin and so on, they many advantages, retaining the structures of foundation pits. In order to promote application sandy Henan province, were a deep pit project high-rise building Zhengzhou. Three middle area selected for site measurement determine mechanical properties areas. Several typical test sections determined along height pile. The vibrating string type reinforcement dynamometers set on H-shaped steel each section, stress distribution depth was obtained via testing. axial force, bending moment shearing force further calculated, affecting factors development laws internal analyzed detail. research shows that, at stage excavation, overall increases gradually. an pile is mainly affected by weight steel, crown beam first support system, breast second frictional resistance cemented soil. are lateral pressure concentrated forces two systems. When excavated base, changes law with regard analyzed. its maximum, maximum absolute values terms −481 KN, 371 KN·m 123 KN. process excavation backfilling, point contraflexure moves down gradually, fixed end corresponding also stabilizes below base. These results may provide reference design construction