Wet heat intensity, characteristics of erosion damage of elastic coat, and its manufacturing technology and engineering application, are studied.

Erosion damage decreases rock load area, after defining damage variable, the damage stress in rock can be calculated by the method bring forward by Lemaitre conveniently.

This paper analyzes the process and the reasons of erosion damage caused by lo- cal scour below a hydraulic building and also put forward some measures to prevent this kind of damage.