煤炭工程 ›› 2015, Vol. 47 ›› Issue (11): 48-51.doi: 10.11799/ce201511016

• 施工技术 • 上一篇    下一篇

复合顶板动压巷道锚索失效机理及合理预应力研究

郭相平,张占涛   

  1. 天地科技股份有限公司
  • 收稿日期:2015-05-08 修回日期:2015-06-12 出版日期:2015-11-12 发布日期:2015-12-07
  • 通讯作者: 郭相平 E-mail:gxp_guoxp2005@126.com

Study on rock cable failure mechanism and reasonable preload of compound roof and dynamic pressure roadway

  • Received:2015-05-08 Revised:2015-06-12 Online:2015-11-12 Published:2015-12-07

摘要: 受强烈动压影响的复合顶板巷道锚索经常会发生大面积支护失效,致使此类巷道在使用过程中需多次维修,成本高,影响安全。文章分析了锚索失效的机理,指出动压影响复合顶板锚索施工过程中预紧力不足是导致锚索支护失效的主要原因。并通过数值模拟和试验研究了导致锚索支护失效的关键影响因素,提出了合理的锚索长度应该在4~6m。现场试验证明,合理的锚索预紧力不仅可以缩短锚索长度,而且可以显著改善巷道的支护效果。

关键词: 复合顶板, 锚索支护, 失效机理, 合理预应力, 强烈动压

Abstract: The rock cables were usually failure in large area in compound roof and dynamic pressure roadway. And the roadway must be repaired for several times, this would result in high costs and affect safety. For this problem, the rock cable failure mechanism was analyzed in this paper. It was shown that the main reason for rock cable failure is inadequate cable preload applied. The key factors which caused rock cable failure were studied by numerical simulation and laboratory tests, and the reasonable length of rock cable was proposed, the length is 4-6m. The field tests shows that reasonable rock cable preload can shorten rock cable length, and the supporting effect of roadway would be significantly improved.

Key words: compound roof, rock cable supporting, failure mechanism, reasonable preload

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