Abstract
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. 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. The Mathews stability map method and Barton limit span theory were used. The reasonable size range of the exposed face of the stope was calculated by performing theoretical analysis on the ultimate span. 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.
Highlights
In the mine empty field mining method, the ore recovery rate increases when the exposed area of the stope is large; this method provides economic benefits to the mining enterprise; the safety hazard of the mine increases [1]
1) The exposed area of the roof is closely related to the limit span and the hydraulic radius
The larger the limit span is, the wider the range of exposure is within a reasonable hydraulic radius
Summary
In the mine empty field mining method, the ore recovery rate increases when the exposed area of the stope is large; this method provides economic benefits to the mining enterprise; the safety hazard of the mine increases [1]. The Mathews stability diagram method [5] combined with Barton limit span theory [6] provides a means for effectively analyzing the exposed area of a stope. FLAC3D 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. When combined with the corresponding calculation model, the failure criterion [8] in the Mohr-Coulomb model is compatible with the elastoplastic material properties of rock and can effectively analyze the progressive failure instability and the geotechnical problems of simulating large deformation. OPTIMIZATION CALCULATION OF STOPE STRUCTURE PARAMETERS BASED ON MATHEWS STABILIZATION GRAPH METHOD.
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