采矿与安全工程学报 ›› 2015, Vol. 32 ›› Issue (6): 950-954.

• 论文 • 上一篇    下一篇

采动压力对锚杆支护结构渐进损伤的数值模拟和实验研究

  

  1. 湖南科技大学煤矿安全开采技术湖南省重点实验室,能源与安全工程学院,湖南湘潭 411201
  • 收稿日期:2015-01-07 出版日期:2015-11-15 发布日期:2015-12-04
  • 作者简介:李青锋(1970-),男,湖南省新宁县人,副教授,从事矿山工程检测与监测方面的研究。
  • 基金资助:

    国家自然科学基金项目(51274096,51374104,51374105);煤矿安全开采技术湖南省重点实验室开放基金项目(201006)

Experimental and numerical simulation study on the progressive damage on the anchorage by the dynamic pressure in mining

  • Received:2015-01-07 Online:2015-11-15 Published:2015-12-04

摘要: 为分析底板巷道锚杆支护结构在采动压力作用下锚固段损伤机理及其承载模式,提高树脂锚杆支护在煤矿现场应用的可靠性,首先采用UDEC 数值模拟软件模拟了上覆煤层开采对前方底板巷道的影响,分析了采动应力对顶、帮锚杆支护结构的作用响应;然后采用FLAC 数值模拟软件模拟了树脂锚杆锚固段的承载及变形,得到了树脂锚杆在一定载荷和围压作用下动力响应;最后以混凝土试块模拟围岩,并在混凝土试块预留孔中锚固了树脂锚杆进行锚杆拉拔试验,并在拉拔同时采用弹性波无损检测仪进行锚杆无损动力检测。结果表明,树脂锚杆的锚固损伤是一种渐进式破坏过程,这种渐进式破坏和锚杆的有效锚固长度可以通过弹性波无损检测方法准确检测,并推断锚杆的实时承载力,从而提高树脂锚杆支护在煤矿现场应用的时效性。

关键词: 树脂锚杆, 锚固体损伤, 弹性波, 无损检测

Abstract: This research is conducted in order to analyze damage mechanism and bearing mode of resin bolt anchoring section of bolt support structure in floor railway under the dynamic pressure in mining, and to improve the reliability of resin bolting in coal mine field applications. First, the mine-induced stress of floor railway is simulated by UDEC while the overlying seam is mining, and the reaction of roof bolt and side bolt support structure is analyzed. Then, the bearing and deformation of resin bolt anchoring section are simulated by FLAC, and the dynamic response of resin bolt under certain load and confining pressure is obtained. Finally, surrounding rock with concrete block is simulated, and bolt pullout test is carried out in the prepared hole in which resin bolt have been anchored, at the same time elastic wave test instrument is used to do nondestructive test for the bolt. The test result shows that 1) the process of resin bolt anchoring damage is gradual, 2) the gradual failure and the effective anchoring length can be detected by elastic wave nondestructive test, and that 3) the real-time bearing capacity of the bolt can be deduced, so as to improve the timeliness of resin bolting in coal mine field applications.

Key words: resin bolt, anchorage body injury, elastic wave, nondestructive testing