Field tests on the effects of diameter of drill pipe on number N of SPT in Xi’an
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摘要: 目前西安地区进行标准贯入试验（SPT）大多使用ϕ50型钻杆，与规范规定的ϕ42型钻杆有所差异。选取西安地区三处工程场地，分别在砂土和黄土状粉土地层中进行两种钻杆直径标贯击数N值对比试验，统计分析了两种杆径测得标贯击数的相互关系及对液化判定的影响。结果表明，钻杆直径对标贯试验击数N值的影响，在不同地层和不同试验深度下结果不同。10 m深度范围内，ϕ50钻杆和ϕ42钻杆测得标贯击数N值较为接近，砂土层中比值N50/N42介于0.98～1.02，黄土状粉土层中比值N50/N42介于1.01～1.05；10～20 m范围内，两种杆径测得标贯击数N值偏差较大，两类土层中比值N50/N42分别介于1.03～1.05和1.05～1.10。此外，采用ϕ50钻杆和ϕ42钻杆数据进行砂土和黄土状粉土地基土液化判定时整体上均为不液化，但在液化边界线附近局部区域，ϕ42钻杆标贯数据判别为液化时，ϕ50钻杆标贯数据判别结果为不液化。Abstract: Currently the application of ϕ50 drill pipe used in the Xi’an for standard penetration test (SPT) is wide, which is different from the code that ϕ42 drill pipe is specified. Based on the three projects in Xi’an, the results of the N values of SPT with drill pipes of ϕ50 and ϕ42 were compared in sand and loess-like silt layer, and the relations beteeen them were statistically analyzed, as well as the effects of diameters on liquefaction. The results show that the diameters of drill pipes have a certain influence on the number N of SPT, and the effects are different due to different strata and test depths. Within the test depth from 0 to 10 m, the number N of SPT with drill pipes of ϕ50 and ϕ42 is close, and the ratio N50/N42 is between 0.98～1.02 in sand and 1.01～1.05 in loess-like silt. When the test depth is from 10 to 20 m, the number N of SPT with both diameters has larger deviation with the ratio N50/N42 between 1.03～1.05 in sand and 1.05～1.10 in loess-like silt. Furthermore, it is generally in non liquefaction state when using ϕ50 and ϕ42 drill pipes for liquefaction discrimination in sand and loess-like silt foundation soil. However, the number N of ϕ42 is evaluated to be in liquefied state in local areas around the liquefaction boundary line, the discrimination result of the ϕ50 drill pipe is non liquefaction.
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Key words:
- standard penetration test /
- drill pipe /
- diameter /
- penetration number /
- liquefaction
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图 1 两种杆径试验标贯击数分布图
Figure 1. Distribution of SPT blow counts of two kinds of drill pipes
图 3 两种杆径试验标贯击数分布图
Figure 3. Distribution of SPT blow counts of two kinds of drill pipes
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