Overburden Normalization for In-Flight Centrifuge Miniature Cone Penetration Testing in Sand

Overburden Normalization for In-Flight Centrifuge Miniature Cone Penetration Testing in Sand
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沙中飞行离心机微型锥体贯入测试的覆盖层归一化

DOI:
10.1061/9780784484036.024
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发表时间:
2022
期刊:
Geo-Congress 2022
影响因子:
--
通讯作者:
Dubief, Yves
Dubief, Yves
中科院分区:
--
文献类型:
--
作者:
Chen, Jiarui;Olson, Scott M.;Banerjee, Soham;Dewoolkar, Mandar M.;Dubief, Yves

文献摘要

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微型锥入度测试(CPT)现在广泛用于离心机建模。解释测试结果的常用方法是将测得的锥尖阻力 qc 标准化为在相同土壤中以 1 atm,qc1 的有效垂直应力测得的值。然而,大多数覆盖层归一化方法源自在校准室中执行的 CPT 或在相对均匀的沉积物中在现场执行的 CPT。本文总结了在净砂离心机模型中进行的飞行中微型 CPT 的测量结果,在该模型中,连续测量尖端阻力,使其有效垂直应力大于 1 atm,而没有任何显着的边界效应或颗粒尺寸效应。基于这些测试结果,作者提出了一种离心机 CPT 特定覆盖层标准化,适用于各种砂子相对密度(约 40%–90%)。飞行中的微型 CPT 数据表明,覆盖层归一化指数通常对相对密度不敏感,并且略大于使用文献方法计算的值。
Miniature cone penetration testing (CPT) is now widely used in centrifuge modeling. A common approach for interpreting the test results is to normalize the measured cone tip resistance,qc, to the value that would be measured in the same soil at an effective vertical stress of 1 atm,qc1. However, most overburden normalization methods are derived from CPTs performed in calibration chambers or from CPTs performed in the field in relatively uniform deposits. This paper summarizes measurements from in-flight miniature CPTs performed in clean sand centrifuge models where tip resistances were measured continuously to an effective vertical stress larger than 1 atm without any significant boundary effect or particle size effect. Based on these test results, the authors present a centrifuge CPT-specific overburden normalization for a wide range of sand relative densities, ~40%–90%. The in-flight miniature CPT data suggest that the overburden normalization exponentmgenerally is insensitive to relative density and is somewhat larger than the values computed using methods from the literature.
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