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Rammed aggregate pier installation effect on soil properties

机译：夯实骨料墩安装对土壤特性的影响

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This paper describes the changes in in situ index properties following installation of rammed aggregate piers in a loose sand deposit in New Madrid, Missouri, with a particular focus on the time-dependent strength gain, commonly called sand ageing, as indicated by increased cone penetration test (CPT) tip resistance and dilatometer test (DMT) indices. The method of disturbing the soil and the magnitude of disturbance significantly influence the magnitude of sand-ageing effects. This paper provides the first data on sand ageing following the installation of displacement rammed aggregate piers. In this study, CPT and DMT were performed both immediately before and after the installation of piers. Additionally, CPTs were performed 1 month following the installation of piers. The DMT horizontal stress index increased roughly 100% and the dilatometer modulus increased 200% in a loose clean sand layer immediately following the installation of the piers. The CPT tip resistance increased roughly 100% in this layer immediately following the pier installation and a further 33% in the month following the installation.
机译：本文介绍了在密苏里州新马德里的一块疏松砂岩矿床中夯实的集料墩安装之后，原位指数特性的变化，并特别关注了随时间变化的强度增加，通常称为砂龄，这是通过增加锥入度来表明的测试（CPT）尖端电阻和膨胀计测试（DMT）指标。扰动土壤的方法和扰动的幅度会显着影响沙质老化效应的幅度。本文提供了位移夯实的集料墩安装后的砂老化的第一个数据。在这项研究中，在码头安装之前和之后立即进行了CPT和DMT。此外，码头安装后1个月进行了CPT。安装桥墩后，在松散的干净沙层中，DMT水平应力指数大约增加了100％，而膨胀计模量则增加了200％。刚安装墩台后，该层的CPT尖端阻力大约增加了100％，安装后一个月又增加了33％。

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