在水利水电工程施工中，经常会遇到爆破开挖对混凝土衬砌的影响，尤其是新浇混凝土衬砌结构。新浇筑混凝土内部随机分布很多微裂隙，这些裂纹在爆破冲击荷载作用下容易扩展连通，特别是衬砌混凝土与基岩粘结面裂纹扩展更应引起注意。本文在考虑混凝土龄期的基础上，对混凝土与岩石粘结面裂纹的动态应力强度因子进行了计算，找出了不同应力波入射角度对裂纹扩展机理的影响。在应力波的垂直入射情况下，混凝土粘结面裂纹扩展主要是应力波在自由面反射形成拉伸应力，致使衬砌混凝土粘结面裂纹拉裂。在应力波的水平入射情况下，混凝土粘结面裂纹扩展形式受混凝土龄期影响。随着混凝土龄期的增加，混凝土与岩石的弹性模量差值逐渐减小，裂纹由剪切破坏变为受压缩张开破坏。

In the construction of water conservancy and hydropower project, young concrete lining structure is often affected by blasting load. Young concrete has a lot of micro-fractures with random distribution, which are easier to propagate and connect under blasting load. This paper focuses on the calculation on dynamic stress intensity factors of bond interface crack of concrete-rock according to concrete age. Result shows that different incidence angles of stress wave lead to different crack propagation mechanisms. Under the normal incidence of impact load, the bonding interface crack propagation of the concrete lining is mainly causing by reflection tensile stress, which forms from the free surface. With horizontal incidence of stress wave, the bond interface crack propagation of concrete lining is affected by concrete age. With the increase of concrete age, the elasticity modulus margin between concrete and rock decreases gradually, and the crack propagation form changes from shear failure to tensile damage.