The Effect of Moisture Content on the Strength and Anisotropy Index of Tropically Weathered Shale

 

Edy Tonnizam Mohamad

Assoc. Prof., Dr. atDepartment of Geotechnics and Transportation Faculty of Civil Engineering; Universiti Teknologi Malaysia, Skudai, Johor
edy@utm.my

Mohd Firdaus Md Dan@Azlan

Postgraduate Student at Department of Infrastructure and Geomatic Faculty of Civil Engineering and Envionment; Universiti Tun Hussein Onn Malaysia,Johor; firdausd@uthm.edu.my

Azizan Abd. Aziz

Assoc. Prof. Ir. At Department of Infrastructure and Geomatic Faculty of Civil Engineering and Envionment; Universiti Tun Hussein Onn Malaysia,Johor; azizanaz@uthm.edu.my

Olumorin Michael Maiye

Postgraduate Student at Department of Geotechnics and Transportation; Faculty of Civil Engineering; Universiti Teknologi Malaysia, Skudai, Johor

Maybelle Liang

Postgraduate Student at Department of Geotechnics and Transportation Faculty of Civil Engineering; Universiti Teknologi Malaysia, Skudai, Johor
maybelle_liang@hotmail.com

 

 ABSTRACT

Moisture content is one of the most important factors and a powerful mechanism manipulating the engineering properties of rock on its physical and mechanical properties. This issue becomes more significant in shale as it possesses fine lamination structures which tend to split unevenly, parallel to the weakness plane. It becomes more severe when the rock material is subjected to higher weathering process. This paper aims to investigate the effect of moisture on the strength, and anisotropy index, Ia(50) of fresh to highly weathered shale collected at Ayer Hitam, Johor, Malaysia. A total of 96 samples representing various weathering grades were tested for this purpose. The samples were tested at varying moisture by immersing them in water at different duration of time. The results revealed that there is a significant relationship among weathering grades, moisture absorption, strength and anisotropy index of shale. The moisture absorption is dependent on the clay minerals present in the rock material which indirectly affects the strength. However, the result shows a unique pattern on the range of anisotropy index for various weathering grades. Shale with higher moisture content and weathering grade exhibits higher range of anisotropy index.

Keywords: Moisture content, tropically weathered shale, strength, anisotropy

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