刀具动态作用下节理岩体破坏过程的数值模拟

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摘要基于细观损伤力学和动力有限元方法，模拟分析了节理岩体在刀具动态荷载作用下的损伤破裂过程，探讨了节理间距和节理角度的影响。在动力分析模型中，通过考虑黏弹性边界以排除边界应力波反射的影响，提高了计算精度。数值模拟结果表明，节理的存在改变了岩体中应力波的传播模式。一方面，节理面反射的拉伸应力波加剧了节理与刀具间岩体的碎裂；另一方面，软弱节理面破坏吸收了应力波能量，阻碍了应力波向下的传播，减弱了下部岩体的破坏程度。模拟结果还表明，节理间距越小，岩体破坏程度更加明显。倾斜节理的存在使刀具下部的裂纹出现不对称性扩展特征，影响了主裂纹向下扩展的能力，限制了其伸展的空间。节理岩体在刀具动态作用下的破坏过程研究还很少见到，研究结果对于节理岩体动态破坏的机理以及地下工程开挖等实际应用，具有一定的参考价值。

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	廖志毅
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	杨岳峰
	王岩
	唐春安

关键词 ：刀具破岩, 动态破坏过程, 节理岩体

Abstract：Based on the microscopic damage mechanics and the dynamic finite element method, the fragmentation process of jointed rock mass under dynamic loading is simulated. In the dynamic analysis model, the viscous boundary is considered to eliminate the influence of the reflected stress waves from the boundary. The numerical results show the joints change the stress wave propagation mode in the rock masses. On one side, the reflected tensile stress on the surface of the joints enhances the fracturing of the rock between the joint and the drill bit. On the other side, the fracturing toward the specimen bottom is restrained due to the fact that the dynamic wave propagation is absorbed by the weak joints. The fragmentation is also influenced by the joint spacing. The rock specimens are more obviously fractured with smaller joint spacing. The inclination of the joints leads to non-symmetric fragmentation at the two sides of the bit and affects the ability of the downward extension of the main crack. The simulation will be helpful for understanding the mechanism of dynamic failure of jointed rock mass and underground engineering.

Key words： rock fragmentation dynamic failure process jointed rock mass

收稿日期: 2012-08-06

TU45

基金资助:国家自然科学基金项目（51079017 51274053）；国家自然科学基金重大国际合作项目（50820125405）；全国优秀博士学位论文作者专项资金（200960）；教育部新世纪优秀人才支持计划项目（NCET-09-0258）

通讯作者: *通讯作者

作者简介: 廖志毅(1989- )，男，江西南昌人，硕士研究生，研究方向为岩石类准脆性材料动态荷载作用下破坏分析。E-mail: liaozhiyi496@163.com。

引用本文:

廖志毅, 梁正召, 杨岳峰, 王岩, 唐春安. 刀具动态作用下节理岩体破坏过程的数值模拟[J]. 岩土工程学报, 2013, 35(6): 1147-1155. LIAO Zhi-yi, LIANG Zheng-zhao, YANG Yue-feng, WANG Yan, TANG Chun-an. Numerical simulation of fragmentation process of jointed rock mass induced by a drill bit under dynamic loading. Chinese J. Geot. Eng., 2013, 35(6): 1147-1155.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2013/V35/I6/1147

[1] LIU H Y, KOU S Q, LINDQVIST P A. Numerical simulation of the rock fragmentation processinduced by indenters[J]. International Journal of Rock Mechanics, 2002,39(4):419-505.
[2] 孙金山),陈明,(陈保国),等. TBM滚刀破岩过程影响因素数值模拟研究[J]. (岩土力学), 2011,32(6):1891-1897. (SUN Jin-shan, CHEN Ming, CHEN Bao-guo, et al. Numerical simulaiton of influence factors for rock fragmentation by TBM cutter[J]. Rock and Soil Mechanics,2011,32(6): 1891-1897. (in Chinese)
[3] 张魁,(夏毅敏),(徐孜军) 不同围压及切削顺序对TBM刀具破岩机理的影响[J].土木工程学报,2011, 44(9): 100-106. (ZHANG Kui, XIA Yi-ming, Xu Zi-jun.
Effects of confining pressure and cutting sequence on the rock-breaking mechanism by TBM cutter[J] China Civil Engineering Journal,2011, 44(9): 100-106. (in Chinese))
[4] 刘喜武) 弹性波场论基础[M].青岛:中国海洋大学出版社,2008. (LIU Xi-wu.
Fundamentals of elastic wave field-theory[M] Qingdao: China Ocean University Press,2008. (in Chinese))
[5] WANG S Y, SLOAN W S, LIU Y H,et al. Numerical simulation of the rock fragmentation process induced by two drill bits subjected to static and dynamic (impact) loading[J]. Rock Mechanics and Rock Engineering, 2010,44(3):317-332.
[6] 杨岳峰),(唐春安),(梁正召). 冲击作用下的刀具破岩机理研究[J]. (岩土力学), 2012.(YANG Yue-feng, TANG Chun-an, LIANG Zheng-zhao.
Rock fragmentation mechanism induced by a drill bit subjected to dynamic loading[J]. Rock and Soil Mechanics, 2012.( (in Chinese))
[7] GONG Q M, ZHAO J, JIAO Y Y. Numerical modeling of the effects of joint orientation on rock fragmentation by TBM cutters[J]. Tunnelling and Underground Space Technology, 2005,20(2):183-191.
[8] GONG Q M, ZHAO J, JIAO Y Y. Numerical modeling of the effects of joint spacing on rock fragmentation by TBM cutters[J]. Tunnelling and Underground Space Technology, 2006,21(1):46-55.
[9] 邹飞,(李海波),(周青春),等. 岩石节理倾角和间距对隧道掘进机破岩特性影响的试验研究[J]. (岩土力学), 2012,33(6):1640-1646. (ZHOU Fei, LI Hai-bo, ZHOU Qing-chun, et al. Experimental study of influence of joint space and joint angle on rock fragmentation by TBM disc cutter[J]. Rock and Soil Mechanics,2012,33(6): 1640-1646. (in Chinese)
[10] 朱万成),(唐春安),(杨天鸿),等. 岩石破裂过程分析用(RFPA2D)系统的细观单元本构关系及验证[J]. (岩石力学与工程学报), 2003,22(1):24-29. (ZHU Wan-cheng, TANG Chun-an, YANG Tian-hong, et al. Constitutive relationship of mesoscopic elements used in RFPA2D and its validations[J]. Chinese Journal of Rock Mechanics and Engineering,2003,22(1): 24-29. (in Chinese)
[11] 唐春安),(王述红),(傅宇方) 岩石破裂过程数值试验[M].北京:科学出版社,2003. (TANG Chun-an, WANG Shu-hong, FU Yu-fang.
Numerical text of rock failure[M] Beijing: Science Press,2003. (in Chinese))
[12] LINDQVIST P A, SUAREZ L M, MONTOTO M. Rock indentation database-testing procedures,result and main conclusions[R]. SKB Project Report, 1994.