The Numerical Simulation and Supporting Design of Gob-Side Entry Retaining in Gradient Medium Thick Coal Seam

Abstract:

In order to solve the technical problem of gob-side entry retaining in inclined coal seam, combined with the practical mining conditions in a certain mine, this paper adopts the discrete element method, applies numerical simulation to analyze inclined coal seam gob-side entry retaining with three different supporting ways, and studies surrounding rock deformation characteristics of gob-side entry retaining. The research results show that the filling body upper boundary for right side can control the roadway surrounding rock deformation better compared with the boundary is used as the hypotenuse; Meanwhile, the pressure of surrounding rock of coal seam gob-side entry retaining is mainly from the impact of the immediate roof natural fall of the upper goaf tilt and the weight of caving coal gangue and coal seam of immediate roof above; According to the surrounding rock deformation characteristics of coal seam remain gateway along goaf, it is determined to use combined supporting method of concrete filling in roadway sides and anchor wire rope supporting inside the roadways, providing the design basis of gob-side entry retaining in coal seam for the similar geological conditions.

• Periodical: Applied Mechanics and Materials (Volumes 368-370)
• Pages: 1812-1815
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.368-370.1812
• Online since: August 2013
• Authors: Yong Qin Zhang, Le Le Sun, Wei Zhong Zhang, Li Dan Cao
• Keywords: Concrete Filling, Discrete Element Method (DEM), Gob-Side Entry Retaining, Inclined Coal Seam, Numerical Simulation

References

[1] Bo Jianbiao, Zhou Huaqiang Hou Chaojiong, et al. Development support technology beside roadway in goaf-side entry retaining for next sublevel [J]. Journal of China University of Mining & Technology, 2004, 33（2）: 183-186.

[2] Wang Zhiyin, Li Yunpeng, Zhang Enqiang. Numerical simulation on the stability of opening in steep coal seam[J]. Chinese Journal of Rock Mechanics and Engineering, 2000, 19（6）: 718-721.

[3] GREEN P. Sublevel caving method extracts coal from 55-deg pitching seam [J]. Coal Age, 1985, 90 (9): 86-89.

[4] HUANG Qing-xiang, LI Dong, LIU Teng-fei, et al. The ground pressure law and support method for re-main entry in critical angle steep seam mining [J]. Ground Pressure and Strata Control, 2004, 21(4): 44-46.