长江科学院院报 ›› 2014, Vol. 31 ›› Issue (11): 120-124.DOI: 10.3969/j.issn.1001-5485.2014.11.0242014,31(11):120-124

• 地下洞室围岩稳定 • 上一篇    下一篇

基于岩体开挖卸荷效应的岩爆机理研究

汪洋,尹健民,李永松,周春华,艾凯   

  1. 长江科学院 水利部岩土力学与工程重点实验室,武汉 430010
  • 收稿日期:2014-08-07 修回日期:2014-11-05 出版日期:2014-11-01 发布日期:2014-11-05
  • 作者简介:汪洋(1979-),男,湖南益阳人,高级工程师,博士,主要从事岩石力学、地应力测试与地下工程稳定性等方面的研究,(电话)027-82927783(电子信箱)hust_wangyang@163.com。
  • 基金资助:
    国家重点基础研究发展计划973项目(2011CB710603);国家自然科学基金项目(51204025);中央级公益性科研院所基金项目(CKSF2013033, CKSF2014064)

Mechanism of Rock Burst Caused by Excavation Unloading Effect

WANG Yang,YIN Jian-min,LI Yong-song, ZHOU Chun-hua,AI Kai   

  1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan 430010, China
  • Received:2014-08-07 Revised:2014-11-05 Published:2014-11-01 Online:2014-11-05

摘要: 针对锦屏二级水电站深埋引水隧洞开挖卸荷引发的岩爆问题,通过数值模拟研究了洞壁围岩卸荷范围和卸荷程度对岩爆的影响效应。研究结果表明随着围岩卸荷范围和卸荷程度的增大,潜在的岩爆动力源区逐步向围岩深部转移,发生岩爆的可能性进一步减小。相比较而言,围岩的卸荷程度比围岩的卸荷范围对岩爆的影响效果更为显著。研究成果为深部地下工程岩爆防治提供了理论依据。

关键词: 岩石力学, 开挖卸荷, 切缝局部应力解除, 岩爆

Abstract: In view of the rock bursts caused by excavation unloading in the deep diversion tunnel of JinpingⅡhydropower station, we carried out numerical simulation to research the effects of unloading range and unloading degree of surrounding rock on rock burst. Research indicates that the potential power source zone of rock burst gradually transfers to the deep and the probability of rock burst is further reduced when the unloading range and unloading degree increase. Moreover, the impact of unloading degree on rock burst is more significant than that of unloading range. The research provides theoretical foundation for preventing rock burst in deep underground projects.

Key words: rock mechanics, excavation unloading, slit local stress relieving, rock burst

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