Simulation of Cracking in Large Arch Dam: Part II

Part two of a complete fracture mechanics investigation of the cracking of the Kölnbrein Arch Dam is presented. Cracking which occurred in the heel region of the dam is investigated using computer simulation and fracture mechanics in an attempt to reproduce observed trajectory and load history before cracking. Four models for the cause of this cracking are described. All four models are shown to be viable mechanisms within the constraints of available cracking data. Each model is shown to possess the capacity to initiate observed cracking in the heel region, and to provide a zone of tensile principal stress with orientation consistent with observed trajectory. It is not possible to eliminate any model on the basis of crack direction of propagation. The necessity for combining simulation with accurate data of various types, and the insufficiency of two‐dimensional analysis are discussed.