岩土工程学报2017，Vol.39Issue(z1)：53-58,6.DOI:10.11779/CJGE2017S1011
钻杆直径对标准贯入试验N值影响的试验研究
Field tests on the effects of diameter of drill pipe on number N of SPT
聂庆科 1贾向新 2秦禄盛 1王英辉 2梁书奇1
作者信息
- 1. 河北建设勘察研究院有限公司,河北 石家庄 050031
- 2. 河北省岩土工程技术研究中心,河北 石家庄 050031
- 折叠
摘要
Abstract
Currently the application of φ 50 drill pipe is more in the standard penetration test (SPT) in the geotechnical engineering investigation, which is different from the code that φ 42 drill pipe is specified. Based on the project in Xiaoyi of Shanxi province, the results of SPT with drill pipes of φ 50 and φ 42 are compared, and the effects of diameters on the number N of SPT are statistically analyzed. The results show that the diameter of drill pipes has a certain influence on the number N of SPT, and the effects are different due to different test depths and strata. When the test depth is from 0.0 to 30.0 m, the ratio of the average values of number N of φ 42 to φ 50 drill pipe is between 0.85~0.87, and the ratio is 1.09 when the test depth is from 30.0 to 40.0 m. In silty clay and silt, the number N of SPT measured by φ 50 drill pipe is greater than that byφ 42 drill pipe, while in dense sand, the number N of the two kinds of drill pipe is close.关键词
岩土工程勘察/标准贯入试验/钻杆/直径Key words
geotechnical investigation/standard penetration test/drill pipe/diameter分类
建筑与水利引用本文复制引用
聂庆科,贾向新,秦禄盛,王英辉,梁书奇..钻杆直径对标准贯入试验N值影响的试验研究[J].岩土工程学报,2017,39(z1):53-58,6.
