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Mechanical behavior of micaceous clays

Journal of Rock Mechanics and Geotechnical Engineering 2019年第5期11卷 1044-1054页

作者： Jiahe Zhang Amin Soltani An Deng Mark B.Jaksa School of Civil Environmental and Mining EngineeringThe University of AdelaideAdelaideSA 5005Australia Department of Infrastructure Engineering The University of MelbourneParkvilleVIC 3010Australia

This study aims to investigate the effect of mica content on the mechanical properties of *** available ground mica was blended with a locally available clayey soil,at varying mica contents by mass of 5%,10%,15%,20%,25%and 30%,to artificially prepare various micaceous clay *** preliminary testing phase included consistency limits and standard Proctor compaction *** primary testing program consisted of unconfined compression(UC),direct shear(DS)and scanning electron microscopy(SEM)*** test results showed that the liquid and plastic limits exhibited a linear,monotonically increasing trend with increase in mica *** rate of increase in the plastic limit,however,was found to be greater than that of the liquid limit,thereby leading to a gradual transition towards a non-plastic,cohesionless *** soft,spongy fabric and high water demand of the mica mineral led to higher optimum water contents and lower maximum dry unit weights with increasing mica *** low confinement conditions,*** UC test and the DS test at low normal stresses,the shear strength was adversely affected by ***,the closer packing of the clay and mica components in the matrix under high confinement conditions offsets the adverse effects of mica by inducing frictional resistance at the shearing interface,thus leading to improved strength resistance.

关键词： micaceous clay Mica content Consistency limits Compaction Shear strength Confinement Frictional resistance

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