Abstract
The environmental conditions due to unreasonable mining in underground stopes, the slurry diffusion mechanism in the grouting reinforcement of a stope within its influence, the causes of large‐scale instability collapse, and the catastrophic stope process are analyzed, and limit upper line analysis theory and numerical analysis methods are comprehensively adopted, revealing the continuous catastrophic collapse mode of large‐scale underground stopes. The method of determining the stope instability collapse boundary and the slip surface within the range based on the theory of the maximum shear strain increment is proposed, and the diffusion radius and range of the grouting slurry during the reinforcement process, which considers the multifield coupling factors, are obtained. The results show that the U‐shaped hidden danger area formed after the collapse of the large‐scale underground stope. The influence range reaches six adjacent stopes, which are symmetrically distributed around the collapse; the mining instability is manifested as a catastrophic chain process of stress change, energy accumulation, state change, and instability collapse. The damage mode of instability collapse is a combination method of wedge collapse, circular arc rotation, triangular translation, and strip slip. According to the multiphysics coupling numerical calculation, the diffusion radius of the grouting slurry is 12 m, exhibiting an elliptical distribution. The research results can be used to comprehensively control the underground mining environment, thus effectively solving the safety problems faced by tunnel or roadway excavations above the goaf.
Highlights
Mineral resources are one of the most basic sources of human production and living materials and are an important material for economic development
To meet the growing demand of economic construction for mineral resources and to maintain stable economic growth, the exploitation of mineral resources should continue to extend deeper and fully recover the hidden resources left in the mining process under the existing technical and economic conditions [4, 5]
This paper presents a method to determine the potential slip surface by searching for the maximum shear strain increment
Summary
Mineral resources are one of the most basic sources of human production and living materials and are an important material for economic development. Ere is still no systematic theoretical research on the methods and means of repair, or the scope and depth of repair and reinforcement, with no standard available to be followed Based on this condition, which is one of the cutting-edge topics in sustainable mining development under the condition of increasingly exhausted resources as the mechanism of large-scale instability and collapse of underground stopes under complex environmental conditions, the reinforcement and restoration of the geological environment in the collapsed area are carried out to realize the safe and efficient mining of hidden danger resources in underground collapsed areas. A method to determine the sliding surface of a stope collapse boundary and scope based on the maximum shear strain increment theory is proposed to improve mining safety and reveal the mechanical behavior mechanism of collapse and control risks, which is combined with a metal ore mine as a case study, in view of the complex mining conditions of the collapsed area. e theory of the upper-bound theorem of limit analysis and rock pressure and rock mechanics theory are used, and the mechanical behavior mechanism of collapse and the diffusion mechanism of grouting in the collapse area are revealed to obtain the causes and catastrophic process of large-scale instability and collapse of stopes. en, based on the Richard model, the grout diffusion trend under time series is explored to guide roadway or tunnel grouting reinforcement and modification work in the future
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