混凝土-岩石界面断裂试验研究进展

Research progress on fracture mechanics of concrete-rock interface

对于建在岩基上的混凝土结构,混凝土/岩石界面是影响结构强度和稳定的薄弱环节,界面含有的裂纹缺陷在复杂荷载条件下可能扩展,从而导致工程结构的损伤破坏。开展混凝土/岩石界面的断裂试验研究,确定其断裂参数和断裂性能,对提高结构的稳定性和耐久性具有重要意义。虽然关于混凝土和岩石的断裂均已有较多的试验研究,但针对两者之间界面断裂特性的研究尚处于起步阶段。对混凝土/岩石界面在静态和动态荷载作用下的断裂试验研究进行了综述。介绍了相关的试验方法和试验装置,分析了混凝土/岩石界面在静态和动态荷载作用下的断裂参数和裂纹扩展过程,并探讨了其在动态荷载作用下的应变率效应。

For concrete structures built on rock foundations,the concrete-rock interface is a weak place that affects the strength and stability of the structure.Flawed crack patterns in concrete-rock interface may expand under complex loading,thus leading to the detriments of structures.Research on the crack of concrete-rock interface to determine its parameters and performance is of significance for enhancing structural stability and durability.Although there have been many experimental studies on the fracture of concrete and rock,the research on the fracture characteristics of their interface is still in its infancy.It studies on fracture tests of concrete-rock interface under static and dynamic loading and approaches the fracture parameters and crack pattern expansion under such circumstances.Strain rate under dynamic loading is alsodiscussed.