Comparing CPT and pile base resistance in sand

IF 0.3 Q4 ENGINEERING, GEOLOGICAL
D. White, M. Bolton
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引用次数: 61

Abstract

The comprehensive database of load tests on closed-ended piles in sand has been re-examined to study the relationship between CPT resistance, qc, and ultimate base capacity, qb. The aim is to establish the origin of low reported values of qb/qc which contrast with continuum models that suggest qb = qc for steady deep penetration. Partial embedment of the pile tip into a hard layer underlying weak material has been accounted for by weighting qc. Partial mobilisation has been accounted for by defining failure according to a plunging criterion. When these two mechanisms are considered, the resulting values of qb/qc have a mean value of 0·90 and show no trend with pile diameter. The remaining slight underprediction of the ‘continuum’ model (qb = qc) could be attributed to the underestimation of plunging load in pile tests for which steady penetration is not reached. This exercise makes two contributions: first, it is suggested that any reduction of qc when estimating the end bearing capacity of closed-ended p...
比较CPT与桩基在砂土中的阻力
对砂土中闭端桩荷载试验综合数据库进行了复核,研究了CPT阻力qc与极限基础承载力qb之间的关系。目的是建立低报告值qb/qc的起源,这与连续统模型相反,表明qb = qc稳定深穿透。桩尖部分嵌入弱材料下的硬层,用加权qc来解释。部分动员是根据暴跌的标准来定义失败的。考虑这两种机制时,得到的qb/qc值均值为0·90,且与桩径无关。“连续体”模型(qb = qc)的剩余轻微低估可归因于在未达到稳定渗透的桩试验中对俯冲荷载的低估。这项工作有两个贡献:首先,建议在估计封闭式p的端部承载力时,qc的任何降低…
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来源期刊
Geotechnical Engineering
Geotechnical Engineering ENGINEERING, GEOLOGICAL-
CiteScore
0.50
自引率
0.00%
发文量
0
期刊介绍: The objectives of the Association shall be the promotion of co-operation among geotechnical societies in SE Asia; and the assistance to member societies who have limited number of members. Now there is only one combined web titled: AGSSEA-SEAGS. SEAGS & AGSSEA encourage the submission of scholarly and practice-oriented articles to its journal. The journal is published quarterly. Both sponsors of the journal, the Southeast Asian Geotechnical Society and the Association of Geotechnical Societies in Southeast Asia, promote the ideals and goals of the International Society of Soil Mechanics and Geotechhnical Engineering in fostering communications, developing insights and enabling the advancement of the geotechnical engineering discipline.
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