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http://dx.doi.org/10.7474/TUS.2020.30.5.473

Numerical Study on Vertical Stress Estimation for Panel Pillars at Room and Pillar Mines  

Yoon, Dong-Ho (Department of Energy Systems Engineering, Seoul National University)
Song, Jae-Joon (Department of Energy Systems Engineering, Seoul National University)
Publication Information
Tunnel and Underground Space / v.30, no.5, 2020 , pp. 473-483 More about this Journal
Abstract
This paper examines the vertical stress change concentrated on mine pillar which occurs due to the stress disturbance from opening excavation at room and pillar mine by FLAC3D, a finite difference method (FDM) software. The mesh size combination is decided with a careful consideration of relative error and run-time, then its performance is verified. A series of numerical analyses is conducted and the vertical stress at central pillar was observed for the test cases of 1×1 to 11×11 mine pillars, 40 m to 320 m depth with 40 m difference. The results show that the vertical stress of pillar approaches to the similar value with the value estimated by tributary area theory(TAT) when the development area (NP) is increased or the height of overburden (HOB) is decreased, while it is overestimated in the opposite case. Furthermore, it also represents that the vertical stress factor (VSF) converges to a specific value when the depth is increased whille keeping the development area identical.
Keywords
Underground mine; Room and pillar mining; Mine pillar; Vertical stress; Numerical simulation;
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Times Cited By KSCI : 9  (Citation Analysis)
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