金属学报  1983, Vol. 19 Issue (2): 89-105

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分段崩落采矿法的稳定性分析

陈俊彦;孙孟澄

中南矿冶学院;美国矿业局丹佛研究中心

STABILITY ANALYSIS OF THE SUBLEVEL CAVING METHOD

CHEN Junyan (Central South Institute of Mining and Metallurgy; Changsha); SUN Mengcheng (Denver Research Centre; Bureau of Mines; U. S. A.)

陈俊彦;孙孟澄. 分段崩落采矿法的稳定性分析[J]. 金属学报, 1983, 19(2): 89-105.
, . STABILITY ANALYSIS OF THE SUBLEVEL CAVING METHOD[J]. Acta Metall Sin, 1983, 19(2): 89-105.

摘要 参考文献 相关文章 Metrics 全文: PDF(1542 KB)   摘要: 本文归纳了用线弹性和非线性的弹-塑性有限元法对于在不同应力场条件下的分段回采巷道的应力分析的结果。从分析中发现,在废石已崩落的分段水平或崩矿的分段水平下面的分段回采巷道将出现临界应力集中。在爆破和放矿的循环中,如果中央回采巷道开采滞后时,将在该进路巷道出现拉伸和剪切破坏。在水平应力场条件下,回采巷道顶板的所有拉伸破坏都不再出现,只有在回采巷道底板上将出现轻微的屈服。与在重力应力场下的分析结果互相比较,当水平应力随着深度增加以后,在分段回采巷道附近的屈服破坏带将会大大变小。然而,预料将有另一种破坏出现,这就是在矿石柱体的测面的中部可能出现过分大的剪应力而导致的剪切破坏。 从分段崩落法稳定性的研究中,可以得出两个主要结论:(1)回采巷道的宽度必须仔细地控制在一定的范围内,并且要选择好恰当地回采顺序;(2)分段崩落法可以用于开采深部矿体,如果将矿柱宽度随开采深度而作相应的增加的话。 Abstract：Ground control problems in subievel caving become evident as the rock pressure increases with depth. Recently, a finite element analysis of the stability problems of the sublevel caving method was completed by the authors. This paper summarizes the results of stress analysis in sublevel extraction drifts under different stress field conditions by using linear elastic and nonlinear elasto-plastic finite element modeling techniques. A critical stress concentration will occur in the uppermost sublevel drifts beneath the caved area or blasted ore area. During the blasting and drawing cycle, a tensile and shear failure condition could develop in the central extraction drift when it would be mined last. Under a high horizontal stress field condition, almost all tensile stress in the back of the extraction drifts will be eliminated and only slight yield can be seen in the floor of the extraction drifts. Compared to the cases under the gravitational stress field condition, the total yielding zone will be grtly reduced because of the increase of horizontal confining stress with depth. However, it is predicted that the centre of each ore column side will experience excessive shear stress that probably will result in ore failure.The two major conclusions drawn from this study to improve the overall stability of sublevel caving are: (1) the width of extraction drifts must be carefully controlled and an appropriate stoping sequence selected; and (2) the sublevel caving method can be used in deep mining if the pillar width is increased correspondingly with mining depth. 收稿日期: 1983-02-18      服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 陈俊彦 孙孟澄 44.8K 链接本文: https://www.ams.org.cn/CN/      或      https://www.ams.org.cn/CN/Y1983/V19/I2/89 1 Janelid, I.; Kvapil, R., Int. J. Rock Mech. Min. Sci., 3 (1965) , 129． 2 Drucker, D. C.; Prager, W. J., Q. Appl. Math., 10 (1952) , 157． 3 Reyes, S. F., Elastic-Plastic Analysis of Underground Openings by the Finite Element Method, Ph. D. Dissertation, Univ. of Ill., Urbana, Illinois, 1966． 4 Bathe, K. J., ADINA (A Finite Element Program for Automatic Dynamic Incremental Nonliner Analysis), Massachusetts Institute of Technology, Cambridge, Massachusetts, Dec, 1978． 5 Herget, G. et al., 10th Canadian Rock Mechanics Symposium, Kingston, 1975． No related articles found! Viewed Full text Abstract Cited   Shared      Discussed