Study on Safe Thickness of Stope Roof and Ground Subsidence Based on Numerical Simulation

Abstract:

It is mainly discussed that the minimum safe thickness of the stope roof and the ground subsidence deformation during mine excavation. The concrete method is deducing the theoretical calculation formula of minimum thickness of the stope roof according to the bending and shearing structural mechanics model respectively so as to gain the minimum safe thickness; A detailed engineering geological 3d model for mining concessions is built by using Auto CAD,and next a numerical calculation model is established by using ANSYS finite element software,following by importing it to numerical simulation software FLAC3D for calculation. By this method,the whole process of mine excavation can be simulated. Finally,the ground subsidence deformation obtained by simulation satisfies the specification requirements.

• Periodical: Advanced Materials Research (Volumes 1065-1069)
• Pages: 71-75
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1065-1069.71
• Online since: December 2014
• Authors: Shuai Hua, Yun An Li*, Yue Wei Wang, Qin Gang Wang, Wei Wang, Feng Hu, Li Zhen Hu, Yin Lei
• Keywords: Ground Subsidence, Numerical Simulation, Roof, Thickness

References

[1] XIAO Yuan, DING Enbao. A research on jointed roofs and induced stability problems[J]. Chinese Journal of Rock Mechanics and Engineering, 1993, 12(4)：353–365.

[2] YANG Zhilin, YU Xueyi, GUO Heming. Study on catastrophe mechanism for roof strata in shallow seam longwall mining[J]. Chinese Journal of Geotechnical Engineering, 2010, 29(7)：1 424–1 434.

[3] FU Yuping, SONG Xuanmin, XING Pingwei, et al. Stability analysis on main roof key block in large mining height work face[J]. Journal of china coal society, 2009, 34(8)：1027–1031.

[4] QIAN Minggao, LIU Tingcheng. Pressure and control of Mining [M]. Beijing: China Coal Industry Publishing House, 1991：79-107.

[5] WANG Kai, KANG Tianhe, LI Haitao, et al. Study of control caving methods and reasonable hanging roof length on hard roof[J]. Chinese Journal of Rock Mechanics and Engineering, 2009, 28(11)：2320–2327.

DOI: 10.1016/j.proeng.2011.11.2236

[6] LIU Xiaobo, AN Long, ZHANG Fengpeng. Analysis on roof stability of gob area based on thin plate theory[J]. Journal of Northeastern University, 2012, 33(11)：1628–1632.

[7] LIU Jun. Mechanical analysis and application of roof based on the thin plate model[D]. Xuzhou: China University of mining and technology, (2008).

[8] PU Hai, HUANG Yaoguang, CHEN Ronghua. Mechanical analysis for X-O type fracture morphology of stope roof[J]. China University of Mining and Technology Press, 2011, 40(6)：835–840.

[9] ZHANG Minsi, ZHU Wancheng, HOU Zhaosong, et al. Numerical Simulation for Determining the Safe Roof Thickness and Critical Goaf Span[J]. Journal of Mining ＆ Safety Engineering, 2012, 29(4)：543–548.

[10] ZHANG Longju, WANG Xingang, LI Yunan. Evaluation of roof stability of karst cave in bridge abutment and its engineering treatment[J]. Yangtze River, 2010, 41(19)：37–40.