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  Analysis of Rock Mass Based on Rock Characterization by Roofbolt Drilling and 3D Data Visualization in Tunneling

  3D visualization of the rock strata and ground conditions for determining the rock mass properties in underground construction, tunneling, and mining is a powerful tool that can help in optimization of ground support design. The required input data can be generated by combining the information obtained through original geotechnical exploration boring and drilling the boreholes such as blastholes and roofbolt holes in tunnels during the construction. The input data includes information of borehole coordinates, depth, orientation, various strata, rock types, their corresponding strength, and presence of joints or shear zones. The inaccuracies in the information on the rock mass layers and joints can be contained by using geo-statistical and graphical approaches to reduce the risk. This allows for incorporation of a substantial amount information generated by drilling without any extra cost and delays into such models. Given that the bolts are often installed in a prescribed pattern, they should be able to generate the information needed for generating a 3D model of the ground. This paper explains this concept and the preliminary work accomplished to include the roofbolt borehole data into a 3D model of the ground.

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