Uniaxial Compressive Strength (UCS) Correlation Analysis on Ground Vibration in Blasting Activities

Abstract

Abstract Pit C2 is one of the active mining area at Sambarata Mine Operation Site which is included in block B1 whose mining sequence are increasingly leading to community and implementing blasting activities in mining operations, so that the ground vibrations are very important in the pit blasting activities. So far, the scale distance method of the signature hole combination used to analyze ground vibrations from blasting activities is considered to be quite good in some interburdens which is indicated by a deviation value of less than 10%. However, in some sandstone and mudstone rock types with relatively high uniaxial compressive strength values (26.92 – 33.87 MPa) showed abnormalities/deviation between the analysis method and the actual ground vibration (more than 10%) compared to other areas (11.17 to 14.67 MPa). After performing a regression analysis comparing the UCS values and the variance of the predicted results, it was found that there was a positive correlation between the UCS values and the variance of the blasting vibration analysis using the equation y = 27,142 x 19,876 with value of R = 0.725. So that the UCS value in the rock needs to be considered in determining vibration and blasting design.

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