Support capacity at roof cutting in mining of shallow coal seam

被引：0
|
作者：
Yang D.-F. [1 ]
Chen Z.-H. [1 ]
Zhu D.-J. [1 ]
Zhang L.-F. [1 ]
Liu X. [1 ]
机构：
[1] School of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2016年 / 38卷
关键词：
Catastrophic theory; Dynamic load; Roof cutting; Shallow coal seam; Support capacity;
D O I：
10.11779/CJGE2016S2047
中图分类号：
学科分类号：
摘要：
Aiming at the support capacity at roof cutting during periodic weighting in mining of shallow coal seam, according to the nonlinear variation characteristics of immediate roof under unstable failure of abutment pressure, a systematic mechanical model composed of upper roof-immediate roof support-waste rock is established. The expressions for support compression quantities under the static and dynamic loading before and after the system instability are derived by using the correlation analysis methods of catastrophic theory and rock dynamics. The formula for calculation the support capacity at roof cutting is obtained and the main factors for the support capacity are analyzed. The results show that the unstable failure of immediate roof leads to the roof cutting. The jump value of the displacement of immediate roof rock directly determines the amount of dynamic loading. The support capacity relates to the cyclic weighting interval, upper load, thickness of immediate roof, stiffness ratio of immediate roof and support and material parameters when the system fails. The rationality of the theoretical derivation is verified by engineering example. The test results are of great significance to the support capacity at roof cutting and the selection of support types. © 2016, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
引用
收藏
页码：286 / 292
页数：6
相关论文
共 15 条
  • [1] Huang Q.-X., Study on Roof Structure and Ground Control in Shallow Seam Longwall Mining, (2000)
  • [2] Gao Q., Yang Z.-Q., Yang Z.-F., Instability forecast and risk evaluation of the surrounding rock masses for a large space stope, Chinese Journal of Geotechnical Engineering, 22, 5, pp. 523-527, (2000)
  • [3] Zhao C.-Z., Li Z.-Q., Wei F.-H., Et al., Catastrophe model of support and surrounding rock of underground engineering, Rock and Soil Mechanics, 26, pp. 17-20, (2005)
  • [4] Qin S.-Q., He H.-F., The study of rockburst on narrow coal pillar by the catastrophe theory, Hydrogeology and Engineering Geology, 18, 5, pp. 17-20, (1995)
  • [5] Yang Z.-L., Yu X.-Y., Guo H.-M., Et al., Study on catastrophe mechanism for roof strata in shallow seam longwall mining, Chinese Journal of Geotechnical Engineering, 29, 12, pp. 1763-1766, (2007)
  • [6] Qi Q.-X., Dou L.-M., Theory and Technology of Rockburst, pp. 32-38, (2008)
  • [7] Dou L.-M., He J., Cao A.-Y., Et al., Mechanism and prevention methods discussion on coal mine rockburst induced by dynamic load, Proceedings of the 50th Anniversary of the Founding of China Coal Society, pp. 294-299, (2012)
  • [8] Pan Y.-S., Lu X.-F., Li Z.-H., Et al., Experimental study of dynamic failure process of roadway under high velocity impact loading, Rock and Soil Mechanics, 32, 5, pp. 1281-1286, (2011)
  • [9] Liu S.-H., Nonlinear catastrophy model and chaotic dynamic mechanism of compound coal-rock unstable failure under coupled static dynamic loading, Journal of China Coal Society, 39, 2, pp. 292-300, (2014)
  • [10] Wang J.-C., Theory and Technology of Thick Seam Mining, pp. 186-190, (2009)
12