The empty element model can be used to simulate the excavation of an ore body. Switching between different models can simulate the engineering behavior of a site. The Mathews stability diagram method combined with Barton limit span theory provides a means for effectively analyzing the exposed area of a stope.įLAC3D has a wide range of applications and has 11 elastoplastic constitutive models and five calculation modes, which can be applied in any combination to simulate soil, rock mass, or other materials. Therefore, calculating optimal exposed areas by using pure theoretical formula is complicated and difficult. Ground pressure is affected by multiple factors because geological conditions in mines are complex and variable. Therefore, designers must consider the safety factor according to the specific surrounding rock condition of a mine and design an optimal exposed surface size on the basis of production safety. In the mine empty field mining method, the ore recovery rate increases when the exposed area of the stope is large thus, this method provides economic benefits to the mining enterprise however, the safety hazard of the mine also increases. Then, FLAC3D calculation and analysis software were used for the simulation of the stope structure, and the most reasonable design of the exposed surface dimension was selected and used as reference for ensuring the safe production of the mine.
The reasonable size range of the exposed face of the stope was calculated by performing theoretical analysis on the ultimate span. The Mathews stability map method and Barton limit span theory were used.
In this study, we used a large-scale tungsten mine in Jiangxi Province as the engineering background and performed on-site engineering geological surveys and indoor ore rock mechanics tests in the middle section of mine 417 to obtain multiple engineering quality indicators for the mines and surrounding rocks. Mathews stability graphic method, based on the rock classification system, measures the stability of the ore roof area of a relatively simple calculation method and provides a theoretical basis for mine rational design stope structure size parameters.
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