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Lu, Rong
- Monitoring and Analysis of Ground Subsidence and Backfill Stress Distribution in Jinchuan Mine, China
Abstract Views :156 |
PDF Views:66
Authors
Affiliations
1 Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, CN
1 Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, CN
Source
Current Science, Vol 115, No 10 (2018), Pagination: 1970-1977Abstract
Backfilling is widely used in mining operations. Deformation of a large volume of backfill leads to rock movement and ground subsidence. This study analysed ground subsidence and backfill deformation, combined with ground subsidence monitoring and numerical simulation. The results showed that the ground subsidence trough was located at the centre of the hanging wall of the ore body. The maximum vertical displacement exceeded 2000 mm. Underground excavation and filling led to stress redistribution. The shear stress concentrated at the backfill boundary and contact zone of the backfill and surrounding rock. The shear stress distribution changed with the shape of the backfill. The corner of the backfill boundary was the key position of shear stress concentration. The Mohr’s circle showed the envelope line where cohesion of 500 kPa could meet the strength requirement in the shallow part of the backfill; in the deep part, the cohesion required was 1500 kPa. The deep part of the backfill therefore failed more easily than the shallow part.Keywords
Backfill Deformation, Ground Subsidence, Mining, Stress Redistribution.Full Text
References
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- Yang, W. and Xia, X., Prediction of mining subsidence under thin bedrocks and thick unconsolidated layers based on field measurement and artificial neural networks. Comput. Geosci., 2013, 52, 199–203.
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- Fengshan, M., Haijun, Z., Tenmao, Y. and Jie, G., Ground movement resulting from underground backfill mining in a nickel mine (Gansu Province, China). Nat. Hazards, 2015, 77, 1475–1490.
- Fengshan, M., Haijun, Z., Yamin, Z., Jie, G., Aihua, W., Zhiquan, W. and Yonglong, Z., GPS monitoring and analysis of ground movement and deformation induced by transition from open-pit to underground mining. J. Rock Mech. Geotech. Eng., 2012, 4, 82– 87.
- Li, X., Wang, S. J., Liu, T. Y. and Ma, F. S., Engineering geology, ground surface movement and fissures induced by underground mining in the Jinchuan Nickel Mine. Eng. Geol., 2004, 76, 93– 107.
- Geometric Characteristics of Slope Toppling Failure and its Interpretation
Abstract Views :285 |
PDF Views:96
Authors
Affiliations
1 Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, CN
2 University of Chinese Academy ofSciences, Beijing 100049, CN
1 Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, CN
2 University of Chinese Academy ofSciences, Beijing 100049, CN
Source
Current Science, Vol 118, No 10 (2020), Pagination: 1569-1574Abstract
Several studies have simulated and studied the phenomenon of toppling failure caused by open-pit excavation. However, these studies do not involve or neglect the interpretation of some special geometric characteristics and laws of this deformation. Only by understanding the subtle geometric characteristics and geometric laws of slope toppling failure, can we understand the conditions, processes and mechanisms of such deformation. In this study, a soft material, small model, deformable element method is successfully used to simulate the phenomenon of the bending each layer element from the lower part of the slope to the upper, with the dislocation distance (scraps on the slope) being bigger. This method overcomes the short-coming of the rigid body element that traditional methods cannot simulate. Finally, the conditions and mechanism of this phenomenon are further analysed and explained by structural unit of inclined composite cantilever and elastic theory. Under the action of the body force component fx which is parallel to the longitudinal direction of the cantilever, the geometric characteristics of the single cantilever in the composite cantilever are changed such that the upper part of it is narrowed and the lower part of it is widened. Under the action of the body force component fy which is perpendicular to the longitudinal direction of the cantilever, the cantilever is bent. Under the action of these two body force components, the composite cantilever is bent as a whole after open-pit excavation. Because of the change in the geometric shape of the cantilever, any single cantilever has a larger deflection than the other single cantilever below it; that is, greater the deflection of each cantilever along the slope upwards, greater is the curvature of the corresponding point. Finally from the lower part of the slope to the upper, the scraps on the slope are bigger.Keywords
Cantilever Beam, Elastic Theory, Geometric Characteristics, Rigid Body Element, Soft Material Small Model, Toppling Failure.Full Text
References
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