Horizontal cracking and crack repair analysis of a super high arch dam based on fracture toughness

Abstract

Abstract The aim of this study is to propose a cracking analysis method for a super high arch dam based on fracture toughness. A local cracking problem of the Xiluodu super-high dam is first introduced in detail in terms of the related horizontal cracking propagation risk during the construction period and the effect on overall stability during the operational period. An engineering procedure is then proposed to define the cracking stability and analyze the effects of crack repair for super high arch dams. This procedure is based on comparing the stress intensity factor KI, obtained using a 3D fracture mechanics approach and numerical simulation, with the experimentally obtained fracture toughness of site-cast fully-graded concreteKIC. The three cracking states of stability, critical stability and crack propagation are defined by the analysis method. The proposed engineering procedure is then applied to predict the cracking risk and effect to the Xiluodu arch dam at elevation level (EL) 358.8–361.8 m. The predictions on cracking stability correlate well with field site deformation monitoring evidence.