THE ENGINEERING SCIENTIFIC OF THE No.23-1 INCLINED ROCK PILLAR IN No.23 CAVERN IN THE ANCIENT UNDERGROUND ROCK CAVERNS IN LONGYOU

The large ancient underground rock caverns in Longyou is an important component of grotto cultural. It has important scientific and engineering value. In order to prove the scientific of No.23-1 inclined rock pillar, A series of studies were carried out. The topography, landform, stratum, structure and earthquake were investigated and analyzed. The cavern was scanned by using Leica C10. The microscopic rock properties was analyzed by using electron microscope scanning tests and X ray diffraction tests. The physical and mechanical properties of rock mass were analyzed through the mechanical tests and the back analysis of numerical simulation. On this basis, the comparative analysis was carried out by using FLAC^3D between No.23-1 inclined rock pillars and the hypothetical vertical rock column with the same volume and average section. The research results confirmed the scientificity of No.23-1 inclined rock pillars. It has important reference value for modern mining engineering, development and utilization of underground space, design and construction of geotechnical engineering.