东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2013, Vol. 34 ›› Issue (10): 1485-1489.DOI: -

• 资源与土木工程 • 上一篇    下一篇

节理岩体中隧洞围岩的损伤破坏机理

马天辉1，张文东1，徐涛2   

  1. (1.大连理工大学土木工程学院，辽宁大连116024；2.东北大学资源与土木工程学院，辽宁沈阳110819)
  • 收稿日期:2013-03-29 修回日期:2013-03-29 出版日期:2013-10-15 发布日期:2013-05-24
  • 通讯作者: 马天辉
  • 作者简介:马天辉(1977-)，男，吉林农安人，大连理工大学讲师，博士.
  • 基金资助:
    国家重点基础研究发展计划项目(2011CB013500)；国家自然科学基金委创新研究群体基金资助项目(51121005)；国家自然科学基金资助项目(41202202，41172265)；中央高校基本科研业务费专项资金资助项目(DUT12ZD102).

Damage and Failure Mechanism of Tunnels in Jointed Rock Mass

MA Tianhui1， ZHANG Wendong1， XU Tao2   

  1. 1. School of Civil Engineering， Dalian University of Technology， Dalian 116024， China; 2. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.
  • Received:2013-03-29 Revised:2013-03-29 Online:2013-10-15 Published:2013-05-24
  • Contact: MA Tianhui
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摘要： 结合细观节理形态的变化，在二轴围压条件下，数值模拟了节理岩体中隧洞围岩损伤破坏过程，研究了节理岩体中隧洞围岩体的破坏机理，分析了岩体中节理倾角对隧洞围岩稳定性的影响规律.结果表明:裂隙的产生和发展延伸主要是拉应力的作用，裂隙延伸方向大致与节理面垂直；节理倾角较小时，岩体中破裂以垂直于节理面的拉裂隙为主；节理倾角较大时，岩体裂隙以沿节理面的滑动裂隙为主；不同倾角的节理面对岩体破坏的脆性也有较大影响；岩体破坏前有大量微裂隙产生，同时伴随着声发射能量的释放，利用微震监测技术抓住这些微破裂前兆信息，能够较好地进行隧洞塌方、冒顶、岩爆等灾害预测，提前做好支护等应对措施，以保障人员、设备安全.

关键词: 节理岩体, 损伤破坏, 数值模拟, 声发射, 微震监测, 岩爆

Abstract: In consideration of the the variation of mesoscopic patterns of joints， the damage process of surrounding rock of an underground opening in jointed rock mass was numerically simulated， and the failure mechanism of surrounding rock was investigated. The effect of the dip angles of joints on the stability of surrounding rock was examined. The results showed that the tensile stress causes mainly the initiation and propagation of the cracks， and the propagation direction of the cracks is roughly normal to the joint surface. The tensile cracks normal to the joint surface are the dominant fracture behaviors around the opening in the rock model with a low joint dip angle， while， the joint sliding are the dominant in the model with a high joint dip angle. The dip angle of joint surfaces also affects the fragility of rock mass. With the initiation of microfracture before the rock failure， a lot of energy will be released as acoustic emission. By using microseismic monitoring technology to get the information of energy release， the collapses， roof falling， rock burst and other disasters can be possibly forecasted， thus the supporting measures could be taken in advance to keep staff and equipment safe.

Key words: jointed rock mass, damage, numerical simulation, acoustic emission, microseismic monitoring, rockburst

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