Abstract
It is critical for the material to be of active supporting capacity before initial collapse of main roof with superhigh water material backfill mining, and the maximum bending moment should be first calculated in order to determine the initial collapse span. In the light of principal of virtual work, the simple expression of deflection, bending moment of elastic clamped plate were deduced under the condition of vertical uniform distributed load, horizontal pressure and supporting by elastic foundation, and then, the maximal bending moment expression was derived too. At the same time, the influence degree on square clamped plate by adding horizontal pressure and elastic foundation were analyzed. The results show that the effect of horizontal pressure on maximal bending moment can be ignored when the value of horizontal pressure is two orders of magnitude less than that of coefficient of elastic stiffness existing elastic foundation.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
He F L, 1988. Analysis of the factors and first weighting span of main roof. Master’s Thesis, China University of Mining & Technology.
Jia X R, Liu M Y, Wang L, 2010. Measurement and analysis of three-dimensional dynamic regularity of the support load on longwall face. Journal of Taiyuan University of Technology, 41(3): 228–240.
Jia X R, Zhai Y D, 1999. The review of ground pressure theory of thin slab in coal mining and its application. Ground Pressure and Strata Control, (3–4): 22–25.
Miao X X, Qian M G, 2003. Broken feature of key strata and its influence on rock pressure in super-length fully-mechanized coal face. Chinese Journal of Rock Mechanics and Engineering, 22(1): 45–47.
Qian M G, Miao X X, Xu J L, 1996. Theoretical study of key stratum in ground control. Journal of China Coal Society, 21(3): 225–230.
Qian M G, Shi W P, 2003. Mining pressure and strata control. Xuzhou: China University of Mining & Technology Press.
Qian M G, Zhu D R, Wang Z T, 1986. The fracture types of main roof and their effects on roof pressure in coal face. Journal of China University of Mining & Technology, (2): 9–18.
Qiao F X, 1985. Modeling study of rock pressure in longwall face. Journal of China University of Mining & Technology, (3): 44–48.
Wang Z T, Qian M G, 1989. The calculating methods of the first weighting span of main roof. Journal of China University of Mining & Technology, 18(2): 9–18.
Yin L Z, Qiao F X, Wang W, 1996. Thin plate model analysis on deflection and displacement of first collapse. Ground Pressure and Strata Control, (3): 21–23.
Wang Z T, Xin L, Fu Z K, Du Y D, Wu J Y, 2010. Calculation and prediction on main roof failure and falling periodical distance of hard igneous rock. Coal Engineering, (7): 58–60.
Zhang Y D, Cheng J Y, Wang X X, Feng Z J, Ji M, 2010. Thin plate model analysis on roof break of up-dip or down-dip mining stope. Journal of Mining & Safety Engineering, 27(4): 487–493.
Zhang F F, 1963. Elastic plate. Beijing: Science Press.
Zhu D R, Qian M G, Xu L S. 1991. Discussion on control of hard roof weighting. Journal of China Coal Society, 16(2): 11–20.
Author information
Authors and Affiliations
Corresponding author
Additional information
Supported by the National Natural Science Foundation of China (41071273); the Special Research Fund for the Doctoral Program of Higher Education of China (200090095110002)
Rights and permissions
About this article
Cite this article
Zhang, Ly., Deng, Kz. Calculation method of first collapse span with superhigh water material backfill mining. J Coal Sci Eng China 18, 374–378 (2012). https://doi.org/10.1007/s12404-012-0407-2
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12404-012-0407-2