Abstract: The first monitoring for surface and deep of surrounding rock was used by high-precision total station instrument and sliding micrometer in large-scale underground caverns in China. According to thirty months monitoring data, the measuring points on rockmass surface of which the displacement are larger distributed on the 5 th and 6 th layers excavation rockmass, the deform ations of deep rockmass is mainly caused by the opened structural plane; and the rockmass of underground caverns is stable during monitoring period. Through monitoring and rapid forecasting, which guide the construction works immediately provide security for the project.

Key words: 3D non-contact deformation monitoring, linear monitoring, underground power house