COMPRESSION AND TENSION TESTS ON AN OPEN-ENDED TUBE PILE IN CHALK

COMPRESSION AND TENSION TESTS ON AN OPEN-ENDED TUBE PILE IN CHALK
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粉笔开口管桩的压缩和拉伸试验

DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
M. S. Atkinson
M. S. Atkinson
中科院分区：
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文献类型：
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作者：
N. Hobbs;M. S. Atkinson

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压缩和拉伸试验结果的开放式钢管桩打入白垩在英迪姆，亨伯赛德，CIRIA报告PG 6，“桩在白垩”的建议进行了比较，并从类似的桩在布莱顿的测试结果。只有前一个试验桩的结果似乎与PG6一致。两个试验桩的结果之间的差异被定性地认为是在两个地点的白垩的差异和它在打桩过程中经历的变化。对Imperial试验桩结果的分析表明，其性能与CIRIA报告PG 6中针对低位移打入桩给出的设计规则所预期的基本相同。尽管如此，Imperial A型白垩中的N值远远超过PG 6中考虑的N值。对于Imperial试验桩，计算出的内部轴阻力约为外部轴阻力的60%。Imperial的结果本身并不能证明在其它地方使用PG6设计规则来处理高N值白垩是合理的。相反，Brighton桩似乎违反PG6规则，这将导致显著低估测得的轴阻力。因此，对强未风化白垩土中的打入桩进行初步载荷试验是必要的。考虑桩周围的白垩类型及其在打桩过程中所遭受的变化，为Imperial和Brighton试验桩结果之间的差异提供了定性解释。
The results of compression and tension tests on an open ended steel tube pile driven into chalk at Immingham, Humberside, are compared with both the recommendations of CIRIA Report PG6, "Piling in Chalk", and the test results from a similar pile in Brighton. Only the results from the former test pile appear consistent with PG6. The differences between the results for the two test piles are considered qualitatively in terms of differences in the chalk at the two sites and the changes which it undergoes during pile driving. Analysis of the results for the Immingham test pile shows it to perform largely as would be expected from the design rules given in CIRIA Report PG6 for a low displacement driven pile. This is notwithstanding that the N values in the Immingham type A chalk far exceed those considered in PG6. For the Immingham test pile the internal shaft resistance is calculated to be about 60% of that developed externally. The Immingham results do not of themselves justify the use elsewhere of the PG6 design rules for chalk with high N values. On the contrary the Brighton pile appears to defy the PG6 rules which would lead to a significant underestimate of the measured shaft resistance. Preliminary loading tests for driven piles founding in strong unweathered chalk are therefore considered to be eseential. Consideration of the type of chalk surrounding a pile and the changes it suffers during pile driving offer a qualitative explanation of the differences between the Immingham and Brighton test pile results.