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通过空腔膨胀理论研究楔形刀具几何参数(刃角)、岩石力学参数(抗压强度、泊松比)对刀具与岩石接触面下岩石弹-塑性交界面半径的影响。结果表明:刀具与岩石接触宽度一定时,刃角越小,岩体的损伤区域越大,从而导致弹-塑性交界面半径增大。在其他因素不变的前提下,岩石泊松比增大或者抗压强度增加都导致弹-塑性交界面半径减小。采用参数敏感性分析方法对3种影响因素的敏感性进行了分析,在接触宽度一定的条件下,刃角的大小对弹-塑性交界半径的影响最大。采用ABAQUS软件建立刀具侵入岩石的数值模型,研究表明,刃角的变化对文中定义的岩体内最大拉应力点空间位置以及最小梯度方向有着显著影响。
The cavity expansion theory is used to study the influence of the geometry parameter (blade angle) and rock mechanics parameters (compressive strength and Poisson’s ratio) on the radius of the elastic-plastic interface of the rock under the contact interface between the tool and the rock. The results show that when the contact width between the tool and the rock is constant, the smaller the edge angle, the larger the damage area of the rock mass, resulting in the increase of the radius of the elastic-plastic interface. With other factors unchanged, the increase of Poisson’s ratio or the increase of compressive strength of rock lead to the decrease of the radius of the elastic-plastic interface. Sensitivity analysis of the three influencing factors was carried out using parameter sensitivity analysis. Under the condition of certain contact width, the influence of the corner angle on the radius of the elastic-plastic boundary is the most important. The ABAQUS software is used to establish the numerical model of tool intrusion into rock. The results show that the change of edge angle has a significant effect on the spatial position of the maximum tensile stress point and the direction of the minimum gradient in the rock mass.