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Investigations of Weathering Effects on Engineering Properties of Supare Granite Gneiss
並列摘要
Weathering and alteration in granite‐gneiss has a deep impact on both the physical and mechanical properties of the rock. To investigate the impacts of weathering on engineering properties of granite gneiss, three samples each of weathered and un‐weathered granite gneiss were collected from Supare. The collected samples were prepared in the laboratory for the determination of physicomechanical properties of weathered and un‐weathered rock samples. From the results of the analysis, weathered sample has average uni‐axial compressive strength (UCS) value of 128 MPa while the Un‐weathered indicated a UCS of 166 MPa. The Water Absorption for the weathered sample is 0.19 % while the Un‐weathered is 0.11 %. The deformation characteristics of the rock sample for weathered and fresh rock were studied and result showed that the peak strain at failure is 5.11× 103 for the weathered sample and the Unweathered is 4.53×103. The result of the testing confirm that the degree of weathering and the associated changes in the physico‐mechanical properties of the granite‐gneiss is directly related to the reduction in Uniaxial Compressive Strength, Point Load Index, Abrassion Resistance and Absorption of the weathered samples. The mode of failure of the rock has been found to be influenced by weathering extent in the rocks. The Un‐weathered sample showed a brittle fracture at failure while the weathered showed a ductile behaviour. The study revealed that deformation characteristics are important characteristics for assessment of the behaviour of weathered granite‐gneiss rock and thus for its suitability for engineering applications.
延伸閱讀
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