Mapping 3D Geological Structures and Predicting the Kinematics of the Pitwalls Using Photogrammetric Techniques: A Case Study
Journal Title: American journal of Engineering Research - Year 2018, Vol 7, Issue 7
Abstract
Traditional method of Mapping geological structures in the mine is usually inaccurate, time consuming and very risky, especially in highly unstable areas. The introduction of 3D structural mapping and pit wall monitoring at Perseus Mining Ghana Limited (PMGL), Ayanfuri has boosted safety and higher accuracy mapping in the mine. A suitable approach is the use of the photogrammetric mapping method. The geological structures of the pit walls were captured using Nikon D7000 camera and processed using SiroVision Version 5.1.11.0 software; and the kinematics analysis was done using Dips Version 5.103 software. In all three individual mosaics were created using stereo models of the faces forming a composite image. The structural mapping was performed using Siro Joint, a component of SiroVision; a total of 50 joints were mapped on the photographs. The orientation of the Dip and Dip directions were determined by plotting the mapped structures in Stereonet. This also helped to determine the areas of low to high concentrations using the Frictional Angle, Pit Slope, Daylight Envelope and the Critical Point. The strength of the intact rock was 54 MPa and the Rockmass Rating (RMR) was 57 which helped to define the class and the description within which the rock was found. The cohesion of the rock mass lies between 200-300 Pa and the frictional angle between 25-30 degrees. SET 1 and 2 were kinematically stable but SET 3 was unstable and hence failure is eminent on that plane.
Authors and Affiliations
Baffoe1 , P. E. ,, Boah . , Afam2 , M.
Keywords
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