Publication: Correlation of mineralogical characteristics with mechanical properties of meta-sedimentary rocks and granitic rocks from natm-1, Karak, Pahang and natm-4, Hulu Langat, Selangor
Date
2012-07-01
Authors
Hassan, Nurfarhana
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Abstract
The Inter-State Raw Water Transfer (ISRWT) Project is designed to assist the process of conveying water for domestic and industrial uses from Semantan River to the Selangor and Kuala Lumpur regions. This tunnel is intended for future demand in diminish water shortage. In this study, two different locations of study areas were chosen, NATM-1 at Karak and NATM-4 at Hulu Langat in order to study the relationship between mineralogical characteristics and mechanical properties of rock. NATM-1 is represented by meta-sedimentary rocks whereas NATM-4 is represented by granitic rocks. In order to study and determine the mineralogical characteristics of the rocks, thin section on both types of rocks were prepared. Some minerals that abundance were observed in the rocks are quartz, feldspar, mica, clay-rich minerals and accessory minerals. To investigate the mechanical properties, point load test and Brazilian tensile strength test were carried out. From the experimental studies, it is noticed that grain size and type of mineral present is strongly influenced the rock strength. Weathering state also took part in affecting the rock’s strength. For granitic rocks, the finer the grain size, the higher the strength of the rock and this is an agreement in both mechanical tests carried out. However, some of samples were highly weathered hence caused to the reduction of strength value of the tested rocks. This is believed due to the abundance of high percentage of altered feldspar. In this study, it can be conclude that fine grain size minerals provides high strength to the rock considering lower percentages of feldspar contents in a fresh state of rock condition.