采矿与安全工程学报 ›› 2014, Vol. 31 ›› Issue (3): 366-372.

• 论文 • 上一篇    下一篇

顶板可接长锚杆耦合支护系统性能研究

  

  1. 中国矿业大学(北京)资源与安全工程学院,北京 100083
  • 出版日期:2014-05-15 发布日期:2014-05-20
  • 作者简介:刘洪涛(1981-),男,吉林省怀德县人,副教授,博士,从事矿山压力与巷道支护方面的研究。 通信作者:王飞 E-mail:wangfeialvin@163.com Tel:15652280365
  • 基金资助:

    国家自然科学基金项目(51204187,51234005);北京高等学校青年英才计划项目(YETP0928)

On the performance of lengthened bolt coupling support system in roadway roof

  • Online:2014-05-15 Published:2014-05-20

摘要: 针对大变形巷道顶板支护系统中锚杆与锚索受力和变形不协调的问题,研发了一种新型可接长锚杆。在对普通锚杆、锚索及新型可接长锚杆拉伸试验和力学分析的基础上,结合大变形巷道顶板围岩的变形破坏特征,提出了大变形巷道顶板可接长锚杆耦合支护系统,建立并分析了可接长锚杆耦合支护系统与锚索耦合支护系统的本构模型。研究表明:当巷道顶板变形量超过锚索最大延伸量时,锚索耦合支护系统中锚索由于延伸率低,过早于普通锚杆达到延伸极限而破断,而可接长锚杆能与普通锚杆在受力和变形2方面协调同步地支护顶板围岩;可接长锚杆能够提高顶板围岩的自承性能,并在保证较强支护力的同时提供更大的让压距离。可接长锚杆耦合支护系统成功应用于赵固一矿11031巷道试验段中,顶板变形量比原支护方案减少了20%左右,顶板围岩从开挖到稳定的时间缩短了33%,且顶板变形稳定后顶板下沉速率较原支护方案明显降低。

关键词: 可接长锚杆, 支护系统, 大变形巷道, 本构模型

Abstract: In view of the force-deformation incoordination problems of traditional anchor and cable in largely deformed roadway roof support system, a new type of lengthened bolt is invented. After a tensile test and mechanical analysis of traditional anchor, cable and new lengthened bolt and an analysis of the deformation and failure characteristics of surrounding rock in large deformation roadway roof, ,a support system for large deformation roadway roof called lengthened bolt coupling support system is devised. The constitutive models of lengthened bolt coupling support system and cable coupling support system are established and analyzed. The research result shows that when the roof deformation exceeds the maximum elongation of cable, the cable in the coupling support system reaches the elongation equilibrium and is broken earlier than the traditional bolt due to the low elongation, but lengthened and traditional bolt could coordinately support the surrounding rock of roof both in deformation and force aspects. Lengthened bolt could improve the self-loading performances of surrounding rock, and not only has a large amount of elongation, but ensures a strong supporting force. Lengthened bolt coupling support system has been successfully applied to the test area of 11031 in Zhaogu Mine. The deformation of new support program is 20% less than that of the ordinary program. Besides, time-cost decreases 33% from roadway excavation to a stable roof rock, and the subsidence speed turns to be much slower than that of an ordinary program.

Key words: lengthened bolt, support system, large deformation roadway, constitutive model