Assessment of the efficacies of correction procedures for multiple thin layer effects on Cone Penetration Tests

Assessment of the efficacies of correction procedures for multiple thin layer effects on Cone Penetration Tests
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锥入度试验中多个薄层效应校正程序的有效性评估

DOI:
10.1016/j.soildyn.2021.106677
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发表时间:
2021
影响因子:
4
通讯作者:
Cooper, Jon
Cooper, Jon
中科院分区:
工程技术2区
文献类型:
--
作者:
Yost, Kaleigh M.;Green, Russell A.;Upadhyaya, Sneha;Maurer, Brett W.;Yerro-Colom, Alba;Martin, Eileen R.;Cooper, Jon

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砂存款中的多个互层细粒层对测得的静力触探(CPT)尖端阻力(qc)具有“平滑”效应,导致对砂层的预测抗液化能力的显著低估。De Lange [14]通过分层砂-粘土剖面的校准室试验确定的趋势在本文中用于开发qc的新薄层校正程序(“Delaware”程序)。使用校准室试验的CPT数据直接评估Delaware和独立开发的Boulanger和DeJong [6]程序的有效性,并从新西兰基督城基于CPT的液化案例历史中间接推断。结果突出了不足40 mm厚的薄层CPT qc校正程序的局限性。多层互层薄层也会影响测得的CPT套管摩擦力(fs),但影响方式比影响qc更为复杂。到目前为止,没有程序已经提出来解决所有的薄层效应现象的measuredfs,在正确表征thefsof一个层固有的影响预测的液化敏感性和潜在的层的准确性的错误。总的来说,迄今为止提出的薄层效应校正程序通常导致对具有高度分层剖面的情况下所观察到的液化严重性的预测稍微不太准确,这与预期和期望的相反。
Multiple interbedded fine-grained layers in a sand deposit have a “smoothing” effect on the measured Cone Penetration Test (CPT) tip resistance (qc), resulting in a significant underestimation of the predicted liquefaction resistance of the sand layers. Trends identified by De Lange [14] through calibration chamber tests on stratified sand-clay profiles are used herein to develop a new thin-layer correction procedure forqc(the “Deltares” procedure). The efficacies of the Deltares and the independently-developed Boulanger and DeJong [6] procedures are both directly assessed using CPT data from calibration chamber tests and indirectly inferred from CPT-based liquefaction case histories in Christchurch, New Zealand. The results highlight limitations of the assessed thin-layer CPTqccorrection procedures for layers less than 40 mm thick. Multiple, interbedded thin layers also influence the measured CPT sleeve friction (fs), but in a more complex way than they influenceqc. To-date, no procedures have been proposed to address all the thin-layer-effects phenomena on the measuredfs, with errors in properly characterizing thefsof a layer inherently influencing the accuracy of predicting the liquefaction susceptibility and potential of the layer. In totality, the thin-layer-effects correction procedures proposed to-date generally result in slightly less accurate predictions of the observed liquefaction severity for cases having highly stratified profiles, opposite of what would be expected and desired.
基督城粉质土壤的液化特征:盖恩斯伯勒储备
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发表时间: 2015
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发表时间: 2015
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发表时间: 2018-06
期刊: --
影响因子: --
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