Numerical Modeling of Equivalent Lagging Support for Mine Gates Based on Core Replacement
In order to simulate the effect of lagging support for the in-situ mine gates in a more realistic fashion, the Core Replacement modeling technique in the Phase 2D finite element software was used to develop 5 models in this research, including the non-support model, the non-lagging support one, and three lagging support ones with a lagging support distances of 2.0 m, 4.0 m and 6.0 m, respectively.The support effect and stability of surrounding rocks under different support patterns were assessed.Firstly, for the non-support case, the maximum development of plastic zone and displacement of the surrounding rocks were found at 9.6 m and 0.058 m, respectively.The mine gate was clearly deformed and broken.Secondly, for comparison, the stability of the mine gate was significantly improved for the non-lagging support model, with the maximum plastic zone and displacement observed at 5.5 m and 0.026 m.Finally, the magnitudes of the plastic zones and displacement for the lagging support models were observed between the previous two models.As the lagging support distance increased from 2.0 m to 6.0 m, the most extension of the failed zones grew from 7.5 m to 7.8 m, and the maximum displacement from 0.041 m to 0.046 m.Therefore, a smaller lagging support distance leaded to a safer and more stable mine gate.The lagging support model accurately simulated the effect of gate support and the in-situ deformation response in a more realistic way, thus providing a valuable reference to mine gate support design and optimization.
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