| 不同围压及切削顺序对TBM刀具破岩机理的影响 |
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| 引用本文： | 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, 0(9): 100-106 |
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| 作者姓名： | 张魁 夏毅敏 徐孜军 |
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| 作者单位： | 中南大学机电工程学院;中南大学现代复杂装备设计与极端制造教育部重点实验室; |
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| 基金项目： | 国家重点基础研究发展计划(2007CB714002); 湖南省研究生科研创新基金(CX2011B089) |
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| 摘 要： | 在综合考虑围压及刀具切削顺序的前提下,利用二维离散单元法建立双把TBM刀具切削节理不发育岩石的仿真模型,模拟出岩石裂纹的生产与扩展全过程。根据获得的裂纹扩展形态以及破碎块形成规则,总结归纳出四种典型破碎模式,并从刀具破岩效率、岩石裂纹扩展能力以及岩石破碎块度三个方面对刀具破岩机理进行进一步研究。仿真结果表明:随着围压的增加,刀具的破岩效率与裂纹扩展能力降低;同时加载方式下破岩效率比先后加载方式要大,而裂纹扩展能力则刚好相反;岩石破碎块度与破碎模式有关。
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| 关 键 词： | 围压 切削顺序 TBM刀具 裂纹扩展 |
Effects of confining pressure and cutting sequence on the rock-breaking mechanism by TBM cutter |
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| Zhang Kui, Xia Yimin Xu Zijun. Effects of confining pressure and cutting sequence on the rock-breaking mechanism by TBM cutter[J]. China Civil Engineering Journal, 2011, 0(9): 100-106 |
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| Authors: | Zhang Kui Xia Yimin Xu Zijun |
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| Affiliation: | Zhang Kui1,2 Xia Yimin2 Xu Zijun1 (1.College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China,2.The Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing of the Ministry of Education,China) |
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| Abstract: | Considering the effects of confining pressure and cutting sequence,2-D simulation models of rock-breaking by double TBM cutters were established by using the discrete element method.The process of induction and propagation of cracks was successfully simulated.According to the style of crack propagation and the formation of fragments,four typical types of breaking modes were identified.Further analyses were conducted to study the breaking efficiency,the ability of crack expansion and the rock fragment sizes.... |
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| Keywords: | confined pressure cutting sequence TBM cutter crack propagation |
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