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为了研究刀具侵入作用下水平节理岩体的损伤演化规律,本文在二维条件下建立基于应变的损伤变量,采用数字散斑相关方法(DSCM)方法实测刀具侵入荷载作用下试件表面表观应变,获得不同荷载状态下损伤分布等值线图。试验结果表明:节理面与贯入荷载垂直的位置首先形成损伤带,随着荷载的增加,损伤程度变大,损伤峰值点位于节理面与侵入方向垂直的位置,其发展方向与宏观裂纹的扩展方向一致。节理试件在拉应力作用下的损伤演化过程能很好预测主裂纹的衍生过程。研究结论可为TBM在节理岩体隧道施工中确定合理的掘进参数提供指导。
In order to study the damage evolution of horizontal jointed rock mass under the action of tool invasion, strain-based damage variables were established in two-dimensional conditions. The apparent surface strain was measured by digital speckle correlation method (DSCM) , Get damage distribution contour map under different load conditions. The experimental results show that the damage zone is firstly formed when the joint plane is perpendicular to the penetration load, and the damage degree increases with the increase of the load. The peak point of the damage is located perpendicular to the intrusion direction of the joint surface. The development direction and the extension of the macro-crack The same direction. The damage evolution process of joint specimens under tensile stress can predict the main crack propagation process well. The research conclusion can provide guidance for TBM to determine reasonable heading parameters in jointed rock tunnel construction.