Study on Numerical Simulation and Safety Analysis of Floor Water Inrush above Confined Water in Deep Mine

Abstract:

Mine water accident due to the mining above confined water is one of the main factors which affects and threatens safety in the coal production, especially for deep mine. Finding out the mine hydrogeological conditions, deepening the research of water inrush mechanism, and taking the effective safety measures of water bursting prevention, are all the key issues of mining under water pressure safely. Based on fractured rock mass equivalent continuum theory, according to drilling imaging method and water pressure test in borehole, in this paper we focus on discussing the water inrush of the floor rock , determining the floor rock permeability tensor with correction method and simulating the floor inrush problem by coupling stress field and seepage field theory and using anisotropic seepage model with FLAC3D. The results show that, the depth of destroyed floor in normal area and fractured zone in fault are about 30m and 58m respectively. According to empirical equation and numerical simulation, we get the results that the effective protection layer thicknesses are 82m and 115m respectively, and it has presented dangers in fault fractured zone based on the water bursting coefficient method.

• Periodical: Advanced Materials Research (Volumes 616-618)
• Pages: 267-271
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.616-618.267
• Online since: December 2012
• Authors: Jian Jun Shen, Wei Tao Liu, Yun Juan Liu
• Keywords: Anisotropic Seepage Model, Corrected Permeability Coefficient Tensor, Coupling Stress Field and Seepage Field, Equivalent Continuum Media, Numerical Simulation of the Floor Inrush

References

[1] Guo Weijia, Liu Weitao, Zhang Wenquan. Special coal mining, Coal industry press, Beijing, 2008. (in Chinese)

[2] Chen Ping, Zhang Youtian. Coupling analysis of seepage/stress for jointed rock[J]. Journal of Rock Mechanics and Engineering, 1994, 13(4): 299-308. (in Chinese)

[3] Weitao Liu, Research on mechanism of lag water bursting of through coal floor fracture and numerical simulation, China University of Mining and Technology , Beijing, 2005. (in Chinese)

[4] Yanqing Wu, Daoyuan Zhang, Introduction of rock mass hydraulics, Southwest jiaotong university press, Chengdu, 1995. (in Chinese)

[5] Itasca Consulting Group, Inc.. Fast Languagian Analysis of continua in 3 dimensions, version 3.0, user'mannual, Intsca Consulting Group ,Inc.,2005.

[6] State administration of work safety, National coal mine safety supervision. Prevention and control of coal mine water regulations[M]. Beijing: Coal industry press.2009. (in Chinese)

[7] State bureau of coal industry. Buildings, water, railway and main shaft sinking and roadway coal pillars and procedure of coal mining [M]. Beijing: Coal industry press.2000. (in Chinese)