Characterization of Some Selected Limestone Deposits in ogun State, Nigeria for Prediction of Penetration Rate of Drilling
| Autor: | Olaleye B. M, Okewale I. A |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | IOSR Journal of Engineering. :25-30 |
| ISSN: | 2250-3021 2278-8719 |
| DOI: | 10.9790/3021-03712530 |
| Popis: | The research correlated physical and mechanical properties with penetration rate of drilling in some typical limestone quarries in Ogun State, Nigeria. The work was carried out using the field data and rock samples collected from the two locations (Sagamu (A) and Ewekoro (B)). Field data were used for the determination of penetration rate while rock samples were used for the laboratory analysis. The result of modal analysis from the thin section shows that sample A has the mineralogical composition of 79.5% calcite, 13.5% quartz and 7.0% opaque while sample B has 77.5% calcite, 17.0% quartz and 5.5% opaque. The average density, porosity and rebound hardness of samples from locations A and B as determined in the laboratory are 2.68g/cm 3 , 3.08%, 32.3 and 2.71g/cm 3 , 3.06%, 35.1 respectively. The result of Uniaxial Compressive Strength (UCS) as estimated from the correlation chart between average density and Schmidt hardness shows that location A has average strength of 61.8 MPa while B has 72.4 MPa. The point load strength index for location A has an average value of 1.6 MPa and B has an average value of 1.8 MPa while the tensile strength as estimated from point load strength index for A is 2.5 MPa and B is 2.7 MPa. The penetration rate as determined from field data shows that location A has an average penetration rate of 0.7 m/min and location B has an average penetration rate of 1 m/min. Statistical model was developed using Statistical Package for Social Sciences (SPSS) software and the result shows that there is a strong correlation between penetration rate and porosity, rebound hardness value and density. The result also shows that the porosity, rebound hardness value and UCS have negative influence on penetration rate while density has positive influence on penetration rate. |
| Databáze: | OpenAIRE |
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