Quantifying CPT cone factors in clays derived from weathered mudstone

IF 1.3 4区 工程技术 Q3 ENGINEERING, GEOLOGICAL
Kevin M. Briggs, Yuderka Trinidad González, William Powrie, Simon Butler, Nick Sartain
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Abstract

The empirical interpretation of cone penetration test (CPT) cone factors ( N k ) can be subject to considerable variability for clays derived from weathered mudstones, leading to significant deviations in the estimation of undrained shear strength ( S u ). This paper presents a comparison of triaxial and CPT data from a site investigation in clays derived from weathered mudstones in central England. Corrected cone factors ( N kt,UU ) were derived from a one-to-one comparison of 94 pairs of unconsolidated, undrained triaxial and CPT data from equivalent depths. The performance of the cone factors was evaluated using a training set (75 pairs) and a test set (19 pairs). A parametric study was used to explore the variability of N kt,UU , quantified using the coefficient of variation (COV Nkt,UU ), for varied separation distance thresholds ( D s ) between individual triaxial and CPT data. The absolute deviation between the laboratory shear strength ( S u(Lab) ) and that predicted from CPT profiles (S u(CPT) ) was not sensitive to N kt,UU values in the range 25 < N kt,UU < 31. The parametric study showed that D s could be increased from 50 to 250 m, to include more data pairs for estimates of N kt,UU , without substantially increasing COV Nkt,UU .
风化泥岩粘土中CPT锥因子的定量分析
对于来自风化泥岩的粘土,锥贯试验(CPT)锥因子(N k)的经验解释可能存在相当大的变异性,导致不排水抗剪强度(S u)的估计存在显著偏差。本文介绍了在英国中部对风化泥岩粘土进行现场调查所得的三轴和CPT数据的比较。校正后的锥因子(nkt,UU)是通过对等效深度的94对未固结、不排水的三轴和CPT数据进行一对一比较得出的。使用训练集(75对)和测试集(19对)对锥因子的性能进行评估。采用参数化研究探讨了Nkt,UU的变异性,并使用变异系数(COV Nkt,UU)量化了个体三轴和CPT数据之间不同的分离距离阈值(D s)。实验室抗剪强度(S u(Lab))与CPT剖面预测抗剪强度(S u(CPT))之间的绝对偏差对nkt不敏感,UU值在25 <范围内;N & t;31. 参数化研究表明,在不显著增加COV Nkt,UU的情况下,D s可以从50 m增加到250 m,以包含更多的数据对来估计Nkt,UU。
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来源期刊
CiteScore
3.40
自引率
14.30%
发文量
66
审稿时长
6 months
期刊介绍: Quarterly Journal of Engineering Geology and Hydrogeology is owned by the Geological Society of London and published by the Geological Society Publishing House. Quarterly Journal of Engineering Geology & Hydrogeology (QJEGH) is an established peer reviewed international journal featuring papers on geology as applied to civil engineering mining practice and water resources. Papers are invited from, and about, all areas of the world on engineering geology and hydrogeology topics. This includes but is not limited to: applied geophysics, engineering geomorphology, environmental geology, hydrogeology, groundwater quality, ground source heat, contaminated land, waste management, land use planning, geotechnics, rock mechanics, geomaterials and geological hazards. The journal publishes the prestigious Glossop and Ineson lectures, research papers, case studies, review articles, technical notes, photographic features, thematic sets, discussion papers, editorial opinion and book reviews.
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