Current Science

Open Access Open Access  Restricted Access Subscription Access

Monitoring and Analysis of Ground Subsidence and Backfill Stress Distribution in Jinchuan Mine, China


Affiliations
1 Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
 

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.
User
Notifications
Font Size

  • Liu, T. Y., Zhou, C. P. and Cai, S. J., New development of cemented fill in various Chinese metal mines. In Proceedings of the 6th International Symposium on Miming with Backfill, Brisbane, Australia, 1998, pp. 49–51.

  • Haslinda, N., Sam, C., Afshin, A., Zainnuddin, M. D. and Bujang, K. H., Effect of inundation on shear strength characteristics of mudstone backfill. Eng. Geol., 2013, 158, 48–56.

  • Woo, K., Eberhardt, E., Elmo, D. and Stead, D., Empirical investigation and characterization of surface subsidence related to block cave mining. Int. J. Rock Mech. Min. Sci., 2013, 61, 31–42.

  • Mohammadali, S., Derek, B. and Robert, A. H., Prediction of mininginduced surface and ground movements at a Canadian diamond mine using an elastoplastic finite element model. Int. J. Rock Mech. Min. Sci., 2017, 100, 73–82.

  • Salamon, M. D. G., displacements and stresses induced by longwall coal mining. In Proceedings of the 7th Congress, Aachen, Germany; 16–20 September, pp, 1199–1202.

  • Li, L. and Michel, A., An analytical solution for the nonlinear distribution of effective and total stresses in vertical backfilled stopes. Geomech. Geoeng. An Int. J., 2010, 5, 237–245.

  • Brady, B. H. G. and Brown, E. T., Rock Mechanics for Underground Mining, The Netherlands, Kluwer, Dordrecht, 3rd edn, 2004.

  • Berry, D. S., Ground movement considered as an elastic phenomenon. Min. Eng., 1963, 37, 28–41.

  • Jennings, J. E., Brink, A. B. A., Louw, A. and Gowan, G. D., Sinkholes and subsidences in the transvaal dolomites of South Africa. In Proceedings of the 6th International Conference on Soil Mechanics and Foundation Engineering, Montreal, Canada, 8–15 September, 1965, pp. 51–54.

  • 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.

  • Cao, S., Song, W., Deng, D., Yuankun, L. and Jianqiang, L., Numerical simulation of land subsidence and verification of its character for an iron mine using sublevel caving. Int. J. Rock Mech. Min. Sci., 2016, 26, 327–332.

  • 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.


Abstract Views: 267

PDF Views: 112




  • Monitoring and Analysis of Ground Subsidence and Backfill Stress Distribution in Jinchuan Mine, China

Abstract Views: 267  |  PDF Views: 112

Authors

Rong Lu
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Fengshan Ma
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Jie Guo
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Haijun Zhao
Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China

Abstract


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.

References





DOI: https://doi.org/10.18520/cs%2Fv115%2Fi10%2F1970-1977