Double layer load cell test of self-balanced method for bearing capacity of super-long bored piles

2019 5th International Conference on Energy Materials and Environment Engineering

能源学;生态环境科学

Cheng, Yuzhu^1

Zhejiang Provincial Institute of Communications Planning, Design and Research, Hangzhou

310015, China^1

关键词: Double layers;    Large diameter;    Post grouting;    Post-grouting technologies;    Self-balanced methods;    Static load tests;    Top-down methods;    Ultimate bearing capacity;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/295/4/042038/pdf
DOI  :  10.1088/1755-1315/295/4/042038

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The large diameter super-long bored pile's bearing capacity is generally very high. The self-balanced method is a new type of static load test method, and it is suitable for the test. At Yueqing Bay No. 1 Bridge, a pile with diameter of 2500 mm and length of 112.0 m was discussed in detail. The post grouting technology at pile bottom was used. The self-balanced method was carried out before and after post grouting. The double layer load cell test method was introduced. The ultimate bearing capacity of the upper, the middle, and the lower part piles were obtained. The test results were converted to the traditional top-down method. The ultimate bearing capacity before grouting was 46932 kN, and it was 70680 kN after grouting. The increment percentage was 50.6%.