Experimental study on the behaviour of granular column-treated soft clay under shear loading

IF 1.7 Q3 ENGINEERING, GEOLOGICAL

Geomechanics and Geoengineering-An International Journal Pub Date : 2022-01-06 DOI:10.1080/17486025.2021.2015977

Iman Hosseinpour, A. Ghorbani, Javad Zarei, Sunil Ranjan Mohapatra

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引用次数: 4

Abstract

ABSTRACT Compacted granular columns are frequently used to mitigate construction difficulties over soft soil deposits through a combination of densification, increasing load-bearing capacity and improvement in consolidation features. The behaviour of granular columns under vertical loading has been well recognised; however, this research is aimed to investigate the behaviour of granular column-reinforced soft soil subjected to shear stress. In this contribution, large-scale direct shear tests were performed, and the influence of undrained shear strength of clay, diameter of granular column and relative density of aggregates was examined. In general, the use of granular column has been shown to improve the shear resistance of the composite ground, which was found to be much significant at lower undrained shear strength of the soft clay. Increasing density of aggregates from Dr = 50% to 90% caused a large portion of the shear stress to be sustained by the accumulated friction of aggregates as the internal friction angle of the treated clay increased from 0 to 28°. In addition, test results revealed that the use of highly compacted column yields a lowered shear displacement at failure, which was indirect evidence of stiffness improvement of the composite ground.

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剪切荷载作用下颗粒柱处理软粘土行为的试验研究

摘要压实颗粒柱通常用于通过致密化、提高承载能力和改善固结特性来减轻软土沉积物的施工困难。颗粒柱在垂直荷载作用下的行为已得到充分认识；然而，本研究旨在研究颗粒柱加筋软土在剪切应力作用下的行为。在这一贡献中，进行了大规模的直剪试验，并考察了粘土的不排水抗剪强度、颗粒柱直径和骨料相对密度的影响。一般来说，颗粒柱的使用已被证明可以提高复合地基的抗剪性能，这在软粘土的不排水抗剪强度较低时非常显著。随着处理粘土的内摩擦角从0°增加到28°，骨料密度从Dr=50%增加到90%，导致大部分剪切应力由骨料的累积摩擦维持。此外，试验结果表明，使用高度压实的柱可降低破坏时的剪切位移，这是复合地基刚度改善的间接证据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geomechanics and Geoengineering-An International Journal ENGINEERING, GEOLOGICAL-

CiteScore

3.80

自引率

0.00%

发文量

期刊介绍： Geomechanics is concerned with the application of the principle of mechanics to earth-materials (namely geo-material). Geoengineering covers a wide range of engineering disciplines related to geo-materials, such as foundation engineering, slope engineering, tunnelling, rock engineering, engineering geology and geo-environmental engineering. Geomechanics and Geoengineering is a major publication channel for research in the areas of soil and rock mechanics, geotechnical and geological engineering, engineering geology, geo-environmental engineering and all geo-material related engineering and science disciplines. The Journal provides an international forum for the exchange of innovative ideas, especially between researchers in Asia and the rest of the world.