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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)

ISSN:2141-7016

Article Title: Determination of Shear Strength and Rock Mass Parameters of Two Nigerian Limestone Deposits
by Saliu, Muyideen Alade and Shehu, Shaib Abdulazeez

Abstract:
The research work determined the shear strength parameters (angle of friction and cohesion), and the rock mass parameters (Tensile Strength, Global Strength and Deformation Modulus) of Obajana and Ewekoro limestone deposits of Nigeria. The Hoek - Brown constants were also evaluated and the Mohr - Coulomb Envelope plotted for the deposits. Obajana Deposit is unique while that of Ewekoro is of three different categories based on hardness, density and mere visual inspection. Schmidt hammer hardness and Density tests were performed. The results obtained were used to evaluate the Uniaxial Compressive Strength (UCS) and consequently, the Point load index (Is) of the rock studied. The shear strength parameters for the kinematic analyses were obtained using Roclab 1.0 from Rocscience with the evaluated intact uniaxial compressive strength, estimated geological strength index, material constants, disturbance factor of the rock and the intact modulus as input parameters. This gives friction angles of 28.980, 24.720, 31.860 and 28.980; and cohesion of 3.414MPa, 1.928Mpa, 5.566MPa and 2.902MPa for Obajana, Ewekoro Type I, Ewekoro Type II and Ewekoro Type III deposits respectively. The intact modulus of 12000mPa and highest level of disturbance by blasting (1) were used. These two chosen values are to ensure maximum factor of safety if the result of the shear strength and rock mass parameters are used in mining and civil design works.
Keywords: friction angle, cohesion, density, in-situ, fracture, strength
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom

 

 

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