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总览 评价 黄干云 * ， 白露 （ 天津大学机械学院力学系，天津 300350； ） 摘要： 岩石压痕研究对刀具破岩机理及岩石力学性质表征等具有重要意义。注意到实际岩石可能会含有各种不连续面如节理，本文利用有限元方法模拟了含节理岩石在压痕下的应力分布情况
黄干云*， 白露
（
天津大学机械学院力学系，天津 300350； ）
摘要：
岩石压痕研究对刀具破岩机理及岩石力学性质表征等具有重要意义。注意到实际岩石可能会含有各种不连续面如节理，本文利用有限元方法模拟了含节理岩石在压痕下的应力分布情况。其中为了模拟节理，引入面力与相对位移线性关系的本构模型，进而利用内聚力界面单元进行模拟。对压痕与节理垂直的情况，有限元数值结果与半解析结果吻合很好，从而验证了有限元模型的有效性。在此基础上，进一步研究了节理埋深和取向对压痕下岩体内应力分布的影响规律。
关键词：
应力分布；节理岩石；压痕；内聚力单元
Huang Ganyun1,*， Bai Lu2,
（
1、Department of Mechanics, School of Mechanical Engineering, Tianjin University,Tianjin 300350； 2、Department of Mechanics,School of Mechanical Engineering,Tianjin University,Tianjin 300350； ）
Abstract：
Rock indentation may hold many implications for understanding the mechanism of rock fragmentation induced by cutters and the characterization of the mechanical properties. Since the practical rocks in general contain a variety of discontinuities, finite element method is used to simulate stress distribution in a jointed rock due to indentation in this work. In order to account for the joint, the linear constitutive relations between the tractions and closure/relative sliding has been adopted and modeled through using the cohesive interface element. When the indentation is vertical to the joint surface, the simulated results agree well with the semi-analytical results, which verifies the validity of the finite element model. Based on that, the influence of joint depth and joint orient on the stress distribution in the indented rock has further been investigated.
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