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Search Results (2)

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Keywords = steeply inclined orebody

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23 pages, 9974 KiB  
Article
Study on Surface Deformation and Movement Caused by Deep Continuous Mining of Steeply Inclined Ore Bodies
by Yanhui Guo, Luo Luo, Rui Ma, Shunyin Li, Wei Zhang and Chuangye Wang
Sustainability 2023, 15(15), 11815; https://doi.org/10.3390/su151511815 - 1 Aug 2023
Cited by 3 | Viewed by 1715
Abstract
In order to study the surface movement and deformation law of deep continuous mining of steeply inclined orebodies in high-stress areas, the surface movement and deformation law of deep continuous mining by caving method in the Shizishan mining area was studied based on [...] Read more.
In order to study the surface movement and deformation law of deep continuous mining of steeply inclined orebodies in high-stress areas, the surface movement and deformation law of deep continuous mining by caving method in the Shizishan mining area was studied based on the field fissures investigation, GPS monitoring, and large-scale geotechnical engineering numerical simulation software FLAC3D 5.0. The results show that with deep continuous mining of the orebody, surface fissures, and monitoring displacement are rapidly increasing. After the stoping of different sublevel orebodies, there will be an obvious settlement center on the surface, and the horizontal surface displacement also shows a trend of gradual increase. The results indicate that surface subsidence at the mine site is in an active development phase. The research results are of great significance to the prevention and control of surface rock movement disasters in mining areas. Full article
(This article belongs to the Special Issue Geological Hazards Monitoring and Prevention)
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20 pages, 10352 KiB  
Article
Monitoring and Analysis of Deformation Evolution Law of Fault Activation Caused by Deep Mining in Shizishan Copper Mine, China
by Yanhui Guo and Luo Luo
Appl. Sci. 2022, 12(14), 6863; https://doi.org/10.3390/app12146863 - 7 Jul 2022
Cited by 8 | Viewed by 1805
Abstract
In order to study the deformation evolution law of fault activation caused by deep mining in Shizishan Copper Mine, China, a monitoring system for fault activation slip is designed and implemented on the basis of the field investigation of footwall fault activation of [...] Read more.
In order to study the deformation evolution law of fault activation caused by deep mining in Shizishan Copper Mine, China, a monitoring system for fault activation slip is designed and implemented on the basis of the field investigation of footwall fault activation of the main orebody in the mining area. The displacement and stress of the fault are monitored by the multipoint displacement meter, bolt stress meter, and borehole stress meter. According to the measured results, the activation deformation laws of fault F2, fault F3, and fault F4 during deep continuous mining are analyzed in detail. The results show that, when the influence range of underground mining spreads to the fault, the increase in the additional tensile stress on the fault plane will reduce the shear strength of the fault and increase the slip of the fault. When the shear stress exceeds the shear strength of the fault plane, the shear failure of the fault plane occurs, the rock mass on both sides of the fault loses stability, and the fault becomes active; when the orebody in the deep sublevel 14 and sublevel 15 were continuously stoped, the development of the mining influence area to fault F2 leads to fault F2’s activation. When stoping the orebody in sublevel 16, fault F3 also activates. With the continuous downward mining of the deep part, the slip amount increases continuously. The fault activation sequence is from fault F2 to fault F3, and then to fault F4. Full article
(This article belongs to the Special Issue Fracture and Failure of Jointed Rock Mass)
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