Safety evaluation with observational data and numerical analysis of Langyashan reinforced concrete face rockfill dam

Deformation characteristics of rockfill and stress condition of slabs play important roles in the safety of concrete face rockfill dam (CFRD). In this study, an analysis based on monitored data and numerical simulation is conducted to evaluate the performance condition of Langyashan CFRD, which is built on a wide valley and has a mansard dam axis. The observational rockfill settlement is analyzed firstly, then a numerical model is established in accordance with the practical engineering. The numerical results of the rockfill settlement exhibit favorable consistency with similar projects or measured data in both construction and operation stages. Furthermore, the deflections and stress states of the face slabs are analyzed, and the effect of rockfill deformation and temperature variations are recognized as the main influence factors. The potential area of the face slabs vulnerable to cracks is predicted based on the stress state. The numerical results provide a reference for safety monitoring and inspection in the future operation.