Analysis and Application of the Dynamic Stability of Overlying Multilayer Spatial Structures in Deep Coal Mine

Abstract:

With the deepening of mining, dynamic disasters appear in a large number in the coal mine, and the stress distribution and stress concentration caused by mining act as the important factors that induce the dynamic disasters. The range of overlying strata movement related to the appearing of mine press go beyond the range of traditional plane model, and influence the mining stress field as overlying strata spatial structures. The movement and distribution of overlying strata spatial structures are the theory bases of studying stress condition and dynamic condition of dynamic disaster. According to the characteristics of sediment rock and the movement of strata of overlying multilayer spatial structures in deep coal mine. By using the dynamic stability judgment rules controlled by the top coals recovery ratio, the author worked out the judgment curves of dynamic stability of overlying multilayer spatial structures and explained their application. This paper also analyzes the factors influencing the dynamic stability of overlying multilayer spatial structures. The suggested judgment rule and curve of dynamic stability have been tested by field experiments which achieved safe caving in isolated caving face by adjusting the top coals recovery ratio. The theoretical basis of designing the safe top coals recovery ratio can be provided according to different overlying strata, and the safe overlying strata controlling can be achieved in deep coal mining.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 2433-2436
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.2433
• Online since: August 2013
• Authors: Hong Shi*, Yan Hui Ge, Jun Li
• Keywords: Dynamic Disaster, Dynamic Stability, Judgment Curve, Overlying Multilayer Spatial Structure, Top Coals Recovery Ratio

References

[1] SONG Zhen-qi. Practical Ground Pressure [M]. Xuzhou: China University of Mining And Technology Press. 1988. 41-78.

[2] JIANG Fu-xing, ZHANG Xing-min, YANG Shu-hua, et al. Research On Overlying Strata Spatial Structures Of Longwall In Coal Mine[J]. Chinese Journal of Rock Mechanics and Engineering, 2006(5)：979-984.

[3] CHENG Yunhai, JIANG Fuxing, ZHANG Xingmin, et al. C-shaped strata spatial structure andstress field in long wall face monitored by microseismic monitoring[J]. Chinese Journal of Rock Mechanics and Engineering, 2007, 26(1)：102–107.

[4] SHI Hong, JIANG Fu-xing. Study on Abutment Pressure Rule of Overlying Strata Spatial Structures Based on Microseismic Monitoring[J]. Chinese Journal of Rock Mechanics and Engineering, 2008, 27(supp. 1)：3274-3280.

[5] SHI Hong, JIANG Fu-xing. Study on relationship between roof stability and top coal's recovery ratio at first weight period in fully-mechanized sublevel caving face[J]. Chinese Journal of Geotechnical Engineering, 2005, 27(4): 414-417.

[6] SHI Hong, JIANG Fu-xing. Application and analysis on rupture regularity of hard and massive overlying strata in fully-mechanized sublevel caving face[J], Chinese Journal of Geotechnical Engineering, 2006, 28(4): 525-528.

[7] YANG Shu-hua, JIANG Fu-xing. Research on The Relationship Between Sublevel Caving Support Load And Roof Structure[J]. Chinese Journal of Rock Mechanics and Engineering. 1999(3): 287-290.

[8] SHI Hong, JIANG Fu-xing. Study On Relationship Between Roof Stability And Top Coal'S Recovery Ratio During Cyclic Weighting In Fully-Mechanized Sublevel Caving Face[J]. Chinese Journal of Rock Mechanics and Engineering. 2005(23)(4231-4237).