摘要
Abstract
In view of the problems of large settlement and deformation in the excavation of the foundation pit in the soft soil area,resulting in wall cracking and pile inclination,this paper takes a residential building as the engineering background,uses the cement soil pile embedded in the micro steel pipe pile and combines the prestressed anchor to form a composite support system,and carries out the on-site pile stress test and indoor bending stiffness test of the micro steel pipe pile,and analyzes the variation law of the internal force of the pile and the horizontal displacement of the foundation pit with the excavation depth and the bending stiffness of the steel pipe pile.The results show that with the in-crease of excavation depth,the axial force of the pile shows an increasing trend,and the upper half of the bending moment value changes great-ly,and the middle and lower part change small.The horizontal displacement of the foundation pit gradually decreases with the excavation depth,and the maximum horizontal displacement occurs at the top of the foundation pit.With the increase of the number of layers at the same excavation depth,the horizontal displacement of the foundation pit gradually decreases.The flexural strength of grouting steel pipe is better than that of hollow steel pipe.关键词
钢管桩/基坑变形/现场监测/承载特性Key words
Steel pipe pile/Foundation pit deformation/On-site monitoring/Load-bearing characteristics分类
建筑与水利
