Abstract:

The large ancient underground rock caverns in Longyou is an important component of grotto cultural. Current task facing the long-term preservation of these unmovable cultural relics is arduous and challenging. The weathering velocity of these caverns is accelerating. The deformation failure of the caverns' surrounding rock is deteriorating. Construction of the maximum-security routes in the caverns might be an efficient way to ensure the security of tourists and reach the target of long-term preservation. In order to establish an optimum schemes, field investigations for the deformation and failure situations of caverns' surrounding rocks are carried out. According to field investigation results, several kinds of failure characteristics are recognized. Numerical analysis is also performed using FLAC3D code. The safety coefficient evaluation method is introduced to assess the stability state of caverns' surrounding rocks in the research progress. Also, various kinds of schemes for construction the maximum-security routes in the caverns are contrasted; and the maximum-security routes through No.1 to No.3 caverns are determined preliminarily.

Key words: stability analysis, safety coefficient, maximum-security routes