采矿与安全工程学报 ›› 2015, Vol. 32 ›› Issue (1): 126-131.

• 论文 • 上一篇    下一篇

深部节理岩体TBM滚刀破岩效果及最优刀间距研究

  

  1. 1.中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏 徐州 221116; 2.河南大学土木建筑学院,河南 开封 475001
  • 收稿日期:2014-06-11 出版日期:2015-01-15 发布日期:2015-03-09
  • 作者简介:孙建中 (1991—),男,江苏省淮安市人,研究生,从事岩石破坏方面的研究。
  • 基金资助:

    国家重点基础研究发展计划(973)项目(2014CB046905);河南省教育厅科学技术研究重点项目(13A560081);江苏省博士后科研计划项目(1302104C)

Research on deep jointed rock fragmentation by TBM cutters and cutters spacing optimization

  • Received:2014-06-11 Online:2015-01-15 Published:2015-03-09

摘要: 为了优化深部岩体中TBM刀盘滚刀的布置,提高TBM掘进效率,采用二维离散元软件UDEC分别研究了节理间距、倾角及贯入度对滚刀破岩的影响。研究结果表明:节理间距为50 mm时,裂纹均扩展到节理面,但节理面对裂纹的扩展有阻隔作用,不管节理的倾角如何,裂纹仍然沿着其倾斜的方向扩展;节理间距不大于100 mm时,岩石的裂纹可以扩展到节理面,节理对裂纹扩展起到控制作用;当节理间距不小于150 mm时,裂纹的扩展无法到达节理面,节理基本不影响裂纹扩展;对于水平节理,节理间距较小时,节理的存在不利于滚刀破岩,随着节理间距的增加,这种不利影响逐渐减弱、直至消失。节理倾角为30°时,由于节理倾角较小,节理间距的减小导致最优刀间距也在减小。节理倾角为60°时,节理间距越小越有利于滚刀的破岩。最佳贯入度随着节理倾角的变大存在逐渐上升的变化趋势,倾角0°变大至90°时,最佳贯入度从2 mm左右比较迅速地增大至7 mm左右。

关键词: 深部节理岩体, TBM滚刀, 最优刀间距, 最佳贯入度

Abstract: In order to optimize the layout of TBM cutters on deep jointed rock and improve the efficiency of TBM, two-dimensional discrete element software UDEC has been used to research the impact of joint spacing, angle and the cutter spacing on the rock fragmentation. The results show that when the joint spacing is 50 mm, cracks extend to the joint surface and spread along the tilt direction despite the barrier effect and the various angle of joints; when the joint spacing is not more than 100 mm, the rock cracks can extend to the joints but the crack propagations is controlled by the joints; when the joint spacing is no less than 150 mm, joints have no impact on the break rocks because the propagation of crack can’t reach the joints. When the spacing of horizontal joints is small, the joints will affect the rock fragmentation and the effects may gradually weaken until disappear with the increase of the joint spacing. The reducing joint spacing resulted in the best cutter spacing reduce when the small joint angle is 30° and the smaller joint spacing was better to break rock when the joint angle is 60°. The best penetration rises gradually with the joint angle increasing and increase more quickly from 2 mm to 7 mm when the joint angle increases from 0° to 90°.

Key words: deep jointed rock, TBM cutters, the best cutter spacing, the best penetration