Dynamic coordination mechanism of paste strength and roof load for gob-side entry retaining

Authors: Zhang, N; Han, C; Yang, K

DOI https://doi.org/10.36487/ACG_rep/1752_31_Zhang

Cite As:
Zhang, N, Han, C & Yang, K 2017, 'Dynamic coordination mechanism of paste strength and roof load for gob-side entry retaining', in A Wu & R Jewell (eds), Paste 2017: Proceedings of the 20th International Seminar on Paste and Thickened Tailings, University of Science and Technology Beijing, Beijing, pp. 277-283, https://doi.org/10.36487/ACG_rep/1752_31_Zhang

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Abstract:
After filling, paste reaches its heyday with the paste wall capable of repeatedly withstanding the fracture pressure of goaf roof. The strength of paste wall should be no less than the roof weighting. In order to identify the dynamic coordination mechanism of filling wall strength and roof pressure, the movement principle of goaf roofs was studied in detail. The weighting characteristics of roofs at different stages were differentiated, with the weighting pressure of specific roof strata structure also obtained. Requirements for the mechanical properties of paste filling wall at different stages of its strength-developing period was also proposed. Paste materials that meet the dynamic coordination requirements were formed based on the experiments for aggregate size and ingredients ratio and consist of crushed stone, sand, cement, coal ash, additive and water. An industrial test was carried out, and the actual effect of paste wall proves the rationality of research results.

References:
Han, C.L., Zhang, N., Li, B.Y., Si, G.Y. and Li, B.G. 2015, ‘Pressure relief and structure stability mechanism of hard roof for gob-side entry retaining’, Journal of Central South University, vol. 22, no. 11, pp. 4445−4455.
Han, C.L., Zhang, N., Wang, X.Q., Li, B.Y. and Li, Z.B. 2013, ‘Bearing behavior of block wall structure in gob-side entry retaining and its application’, Journal of Mining and Safety Engineering, vol. 30, no. 5, pp. 673-678.
Han, C.L. 2013, ‘Stress Optimization and Structure Stability Control for the Surrounding Rock of Gob-side Entry Retaining’, PhD thesis, China University of Mining and Technology, Xuzhou.
Han, C.L., Zhang, N., Yao, Y.H., Zhang, N.C. and Ming, J. 2013, ‘Transfer bearing mechanism of thick composite roof in gob-side entry retaining’, Rock and Soil Mechanics, vol. 34, no. S1, pp. 318-323.
Hua, X.Z. and Li, Y.F. 2016, ‘Mechanics analysis on floor deformation of gob-side entry retaining and prevention and control of floor heave’, Journal of China Coal Society, vol. 41, no. 7, pp. 1624-1631.
Kang, H.P., Niu, D.L., Zhang, Z., Lin, J., Li, Z.H. and Fan, M.J. 2010, ‘Deformation characteristics of surrounding rock and supporting technology of gob-side entry retaining in deep coal mine’, Chinese Journal of Rock Mechanics and Engineering, vol. 29, no. 10, pp. 1977-1987.
Li, X.H., Ju, M.H., Yao, Q.L., Zhou, J. and Chong, Z.H. 2016, ‘Numerical Investigation of the Effect of the Location of Critical Rock Block Fracture on Crack Evolution in a Gob-side Filling Wall’, Rock Mechanics and Rock Engineering, vol. 49, no. 3, pp. 1041-1058.
Ning, J.G., Ma, P.F., Liu, X.S., Zhou, J. and Liu, W. 2013, ‘Supporting mechanism of “yielding-supporting” beside roadway maintained along the goaf under hard rocks’. Journal of Mining and Safety Engineering, vol. 30, no. 3, pp. 369-374.
Sun, X.M., Liu, X., Liang, G.F., Wang, D. and Jiang, Y.L. 2014, ‘Key parameters of gob-side entry retaining formed by roof cut and pressure releasing in thin coal seams’. Chinese Journal of Rock Mechanics and Engineering, vol. 33, no. 7, pp. 1449-1456.
Tan, Y.L., Yu, F.H., Ning, J.G. and Zhao, T.B. 2016, ‘Adaptability theory of roadside support in gob-side entry retaining and its supporting design’, Journal of China Coal Society, vol. 41, no. 2, pp. 376-382.
Tan, Y.L., Yu, F.H., Ning, J.G. and Zhao, T.B. 2015, ‘Design and construction of entry retaining wall along a gob side under hard roof stratum’. International Journal of Rock Mechanics and Mining Sciences, vol. 77, pp. 115-121.
Wang, P. and Zhang, Y.H. 2016, ‘Performance Improvement for High-water-content Filling Material Beside Gob-side Entry Retaining’, Safety in Coal Mines, vol. 47, no. 2, pp. 51-54.
Wang, W.M., Xu, F. and Qin, W.L. 2013, ‘Coal Rejects Backfill Support Technology of Gob-side Entry Retaining in High Gassy Mine’, Coal Science and Technology, vol. 41, no. 12, pp. 1-3.
Xie, S.R., Xu, L., Zhang, G.C., Gong, S.Y. and Yang, L.G. 2015, ‘Subsidence broken of deep gob-side entry retaining surrounding rock structure with large mining height and its control’, Rock and Soil Mechanics, vol. 36, no. 2, pp. 569-575.
Ye, G.X., Zhu, Q.J., Li, S. and Yu, Z. 2016, ‘Development and application of composite filling body in gob-side entry retaining with 1000 m-plus deep coal mine’, Journal of Mining and Safety Engineering, vol. 33, no. 5, pp. 787-794.
Zhang, D.S., Miao, X.X., Feng, G.M. and Song, Z.Q. 2003, ‘Stability control of packing body for gob-side entry retaining in fully-mechanized coal faces with top-coal caving’, Journal of China University of Mining and Technology, vol. 32, no. 3, pp. 232-235.
Zhang, N., Yuan, L., Han, C.L., Xue, J.H. and Kan, J.G. 2012, ‘Stability and deformation of surrounding rock in pillarless gob-side entry retaining’, Safety Science, vol. 50, no. 4, pp. 593-599.




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