斯德哥尔摩粘土指标及变形特性的岩土力学表征

IF 0.9 Q4 GEOSCIENCES, MULTIDISCIPLINARY
S. Hov, David Gaharia
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引用次数: 0

摘要

本文介绍了斯德哥尔摩粘土的指标和变形特性的岩土力学特征。这些粘土在地理上和深度上都表现出很大的变化。粘土的范围从高塑性的高有机粘土到低塑性的粉质粘土。首先,概述了粘土的地质条件,以定性地解释斯德哥尔摩地区遇到的典型土壤地层学。其次,介绍了两个大型通用数据库,分别包含3,500和1,600个数据点。数据来源于商业项目中进行的常规测试和恒速率应变计测试。对数据进行了分析,并与高质量块采样结果进行了比较。可以看出,粘土的一个共同特征是低不排水抗剪强度,因此低屈服应力和流量计模量。此外,一些变形特性,如预固结压力和几个流量计模量,被证明取决于土壤的天然含水量及其塑性。样品质量的差异会严重影响某些特性,突出了样品质量采样和处理的重要性。根据预固结压力前后的测径模量,提出了这类粘土试样质量的判据。希望本文能对世界范围内类似土壤的工程技术人员提供有益的参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geotechnical characterization of index and deformation properties of Stockholm clays
This paper describes the geotechnical characteristics of index and deformation properties of Stockholm clays. These clays exhibit large variations both geographically and with depth. The clays range from highly organic clays with high plasticity to silty clays with low plasticity. First, the geological conditions of the clays are outlined to qualitatively explain the typical soil stratigraphy encountered in the Stockholm area. Second, two large generic databases are presented, containing 3,500 and 1,600 data points, respectively. The data originates from routine testing and constant rate of strain oedometer tests conducted in commercial projects. The data is analyzed and compared with results from high quality block sampling. It is seen that a common feature of the clays are low undrained shear strengths, and consequently low yield stresses and oedometer moduli. Further, several deformation properties such as preconsolidation pressure and several oedometer moduli is shown to depend on the soils natural water content and its plasticity. Differences in sample quality is shown to highly affect some properties, highlighting the importance of quality sampling and handling of samples. Criteria for sample quality for this type of clay is proposed based on the oedometer moduli before and after the preconsolidation pressure. The paper can hopefully work as a useful reference to engineers working on similar soils worldwide.
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来源期刊
AIMS Geosciences
AIMS Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
自引率
7.70%
发文量
31
审稿时长
8 weeks
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