CRACK DEVELOPMENT MECHANISM AND REINFORCEMENT SUPPORT OF THE ROCK ROOF OF NO.3 CAVERN IN LONGYOU GROTTOES

In order to slow down the development of cracks in the rock roof of No. 3 cavern in Longyou Grottoes, this paper adopts the method of the investigation of factors and the mechanical calculation and analysis of the cracks development mechanism. The paper analyzes the variation law of the rock roof by monitoring date. The results show that:(1)The factors causing cracks of the rock roof are complicated, and mainly are due to the low fracture toughness of the surrounding rock of mainly sandstone. (2)The cracks in the unsupported area are intensified developed and the uneven settlement of roof increases gradually. According to the deformation law, this paper designs a supporting scheme and visualizes the supporting structure by BIM(Building Information Modeling). This paper further proposes an intelligent monitoring program for the supported caverns. The support schemes and intelligent monitoring program can play an important role in the long-term protection of the rock caverns.