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http://dx.doi.org/10.7474/TUS.2018.28.2.142

A Study on the Stratum Thickness Arrangement and Roof Bolt Support Design using Robust Design  

Jang, Myoung Hwan (Mining & Geotechnical Team, Korea Resources Corporation)
Publication Information
Tunnel and Underground Space / v.28, no.2, 2018 , pp. 142-155 More about this Journal
Abstract
The ${\bigcirc}{\bigcirc}$ mine has irregularly developed stratum around the ore body. The purpose of this study is to array irregular stratum thickness systematically for effective roof bolting and to implement a supporting system corresponding to it. The number of 81 cases combined with stratum thicknesses was limited to 9 cases by robust design. For each case, the load height which can act as a roof load was determined by the characteristics of stratum and RMR. The load range due to the load height is calculated assuming block shaped and arch shape. The support load of the roof bolt was considered as the average load of the two methods. Numerical analysis results of the support design showed that the cable bolt was more effective for the roof supporting fully grouted than the anchoring type. As a result of the construction, it was possible to control the roof, but all of the roof was gradually sinking downward due to the deformation of the side wall of the mine tunnel.
Keywords
Roof bolt; Stratum thickness; Robust design; Roof load; Fully grouted;
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