Analysis on dam-break case of concrete arch dam and forecast of failure scope based on point safety factor

摘要

In order to quantitatively forecast failure scope, Xiaozhaizihe Reservoir concrete arch dam is chosen as a dam-break event case in this paper. 3-D solid model is built and elastic-plastic finite element method is used by ANSYS software. The dam work conditions of its water levels, its temperature drop and weight are defined by the early period storage and climatic conditions. The dam-break loads (or forces) of the dam and its base are simulated. Results show that the dam structure is not strong enough, and its design is not meeting the specifications, and the weakest position of dam is at the junction both phase I and phase II of the cold concrete. So it's concluded that the dam-break early occurred where the compressive and tensile strength M-C safety factor is less than 1, and the dam-break end-scope cover the safety factor 2.0 M-C so that people forecast the quantitative failure scope of concrete dam.