The Impact Analysis of Ground Stability Caused by Exploiting Underground Coal

Abstract:

Disaster caused by exploiting underground coal is due to original mechanical equilibrium of underground rock has been destroyed when underground coal is exploited. And Stress redistribution and stress concentration of wall rock in the goaf happened too. As many complex factors exist such as complex structures of ground, multivariate stope boundary conditions, many stochastic mining factors and so on, it is difficult to evaluate the damage of the geological environment caused the excavation by surrounding underground coal accurately. Besides that, the coexistence of continuous and discontinuous of deformation and failure of wall rock make a strong impact on the ground, and the co-exist of tension, compression and shear failure also pay a great deal contribution to the destroy. Due to the mechanical property and deformation mechanism of goaf are complex , changeable, nonlinear and probabilistic, which changes with in space and time dynamically, it can not be studied analytically by the classical mathematical model and the theory of mechanics computation. Through finite element analysis software ABAQUS, a numerical simulation of the process of underground coal mining have been made. After make a research of the simulation process, it shows the change process of stress environment of wall rock and deformation and failure process of rock mass during the process of coal mining. The numerical simulation of the process can provide theoretical basis and technical support to the protection and reinforcement of laneway the process of coal excavation. Besides that, it also provides a scientific basis and has a great significance to reasonable Excavation and control of mind-out area.

• Periodical: Advanced Materials Research (Volumes 243-249)
• Pages: 3147-3150
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.243-249.3147
• Online since: May 2011
• Authors: Shu Xian Liu, Xiao Gang Wei, Shu Hui Liu, Li Ping Lv
• Keywords: Coal Excavation, Numerical Analysis, Randomicity, Stress Concentration

References

[1] H.Guo-qing, Y.Lun: Mining Engineering Subsidence Study. Xuzhou: China University of Mining and Technology Press.(1994). (In Chinese)

[2] Coal industry Department: Code for Buildings, Water, Railways, Main Goal Lane and Coal Mining. Coal Industry Press.(1985). (In Chinese)

[3] Claris.H. Mining Damage and Protection. Translation by MA Wei-ming interprets. Beijing: Coal Industry Press. (1984).(In Chinese)

[4] GB50007-2002 Code for design of building foundation. Beijing: China Architecture and Building Press.(2002). (In Chinese)

[5] Y. Guang-ming, Y. Lun: Estimation ofDamage Degree of Building and StructuresDue toMining Subsidence and the Study of Damage Mechanism. Journal of Fu Xin Mining Institutes, 1(1)p: 41-45. (1992). (In Chinese)

[6] Z. Chuan-l, X. Wei: Analyses of the anti-deformation function of frame construction. Shanxi Architecture, 32(13)pp.61-62. (2006) . (In Chinese)

[7] L. Li-ming: Matter-element evaluation method and application to damaged buildings caused by ground subsidence . Journal of Disaster Prevention and Mitigation Engineering, 23(2)pp.94-99. (2003). (In Chinese)

[8] G.Wen-bing, W. Cai-fang, Ka-zhong DENG: Artificial neural network prediction model of mining- induced damage of buildings . Chinese Journal of Rock Mechanics and Engineering, 23(4)p: 583-587. (2004). (In Chinese)