基于颗粒离散元的矿柱群连锁失稳机理分析
Study on the mechanism of pillars cascading failure based on discrete particle flow code
-
摘要: 矿矿柱群连锁失稳是破坏后果最为严重的采空区失稳模式。本文利用颗粒流离散元PFC2D研究了矿柱群连锁失稳的动态过程以及不同的矿柱安全系数、不同的诱发位置、不同的顶板刚度对矿柱群连锁失稳的影响。结果表明:(1)矿柱群的连锁失稳从诱发矿柱开始,失稳矿柱的应力传递到相邻未失稳的矿柱上造成相邻矿柱失稳,由此引发连锁效应;(2)矿柱的储备安全系数与载荷传递量的相对关系是决定矿柱群是否发生连锁失稳的关键;(3)矿柱群大规模失稳与诱发位置有关,诱发矿柱位于采空区的中心位置更容易形成大规模失稳,而位于采空区的边界位置,由于边界矿柱约束支撑作用则不容易诱发大规模失稳;(4)顶板的刚度显著地影响矿柱群的连锁失稳过程,刚度小的软弱顶板条件下,载荷传递从诱发位置向空区边界依次传递,失稳过程具有显著的"多米诺骨牌效应",而刚度大的坚硬顶板条件下,载荷传递与矿柱失稳不再表现出显著的"多米诺骨牌效应"。本文的研究成果可供开展相关工作借鉴。
-
关键词:
- 矿柱群 /
- 连锁失稳 /
- 颗粒离散元刚度安全系数
-
-
[1] [1] Zipf RK. Toward pillar design to prevent collapse of room-and-pillar mines. 2011, NIOSH – Spokane Research Laboratory: Spokane.
[2] [2] Be′resta P, Brouardb B, Feugac B, Karimi-Jafaria M. The 1873 collapse of the Saint-Maximilien panel at the Varangeville salt mine[J]. International Journal of Rock Mechanics and Mining Sciences, 2008, 45(7): 1025-1043.
[3] [3] Isabel N. Alvarez-Garcia, Francisco L. Ramos-Lopez. The mine collapse at Lo Tacón (Murcia, Spain), possible cause of the Torre Pacheco earthquake (2nd May 1998, SE Spain)[J]. Engineering Failure Analysis, 2013, (28): 115-133.
[4] [4] Wang, J.A., X.C. Shang., H.T. Ma. Investigation of catastrophic ground collapse in Xingtai gypsum mines in China[J]. International Journal of Rock Mechanics and Mining Sciences, 2008, 45(8): 1480-1499.
[5] [5] Wei Chong-tao, Y.J.-h, Li Zhuang-fu, Li Lai-cheng.Comprehensive study on a collapse column in Kongzhuang coal mine.The 6th International Conference on Mining Science & Technology, 2009: 895-902.
[6] [6] Poulsen B A, Shen B. Subsidence risk assessment of decommissioned bord-and-pillar collieries[J]. International Journal of Rock Mechanics and Mining Sciences, 2013, (60): 312-320.
[7] [7] 丘帆,马海涛,欧阳明,杨海露,王虎.基于Voronoi图和时间效应的矿柱失稳预测[J]. 中国安全生产科学技术,2014,(02):38-43. QIU Fan, MA Haitao, OU Yangming, YANG Hailu, WANG Hu. Pillar instability prediction based on voronoi graph and time effect[J]. Journal of Safety Science and Technology, 2014,(02):38-43.
[8] [8] MA Hai-tao, WANG Jin-an, WANG Yun-hai. Study on mechanics and domino effect of large-scale goaf cave-in[J]. Safety Science, 2012, 50(4): 689-694.
[9] [9] 周子龙,李夕兵,赵国彦.民窿空区群级联失稳评价[J].自然灾害学报,2007, (05) :91-95. ZHOU Zilong, LI Xibing, ZHAO Guoyan. Assessment of cascading failure of goaf[J]. Journal of Natural Disasters,2007, (05) :91-95.
[10] [10] Zilong Zhou, Lu Chen, Yuan Zhao, Tongbin Zhao, Xin Cai, Xueming Du. Experimental and Numerical Investigation on the Bearing and Failure Mechanism of Multiple Pillars Under Overburden[J].International Journal of Rock Mechanics and Mining Sciences,?2013, (60): 363-369.
[11] [11] 周子龙,陈璐,赵源,董陇军,杜雪明,蔡鑫.双矿柱体系变形破坏及承载特性的试验研究[J].岩石力学与工程学报,2017,(02):420-428. ZHOU Zilong, CHEN lu, ZHAO Yuan, DONG Longjun, DU Xueming, CAI Xing. Experimental study on the failure characteristics and load bearing capacity of double pillar system[J]. chinese journal of rock mechanics and engineering,2017,(02):420-428.
[12] [12] Reed Guy, Mctyer Kent, Frith Russell. An assessment of coal pillar system stability criteria based on a mechanistic evaluation of the interaction between coal pillars and the overburden[J]. International Journal of Mining Science and Technology, 2017, (27): 9–15.
[13] [13] Li Chong, Xu Jinhai, Wang Zhongliang, Qin Shuai. Domino instability effect of surrounding rock-coal pillars in a room-and-pillar gob[J]. International Journal of Mining Science and Technology, 23 (2013): 913-918.
计量
- 文章访问数: 678
- HTML全文浏览量: 9
- PDF下载量: 417
下载:
邮件订阅
RSS