北山隧道式大跨度地下四季滑雪场 围岩稳定性研究.

Aiming at the problems of complex engineering geology, long service life and stability of large-span chamber (exposure area up to 2 000 m² or more) of Beishan cross-country ski resort rebuilt by Jilin Beishan Civil Air Defense Project, refinement investigation of rock mass structure was carried out. The indoor rock mechanics experiment and wave velocity test in borehole were conducted. Structural surfaces investigation based on photogrammetry method combined with the method based on in borehole radar and television was adopted to study the surface joints, fractured zones and spatial distribution of loosening zone of surrounding rock mass. The quality of surrounding rock was classified and zoned, the mechanical parameters were determined, and the stability of surrounding rock was studied. Through numerical simulation analysis and calculation of large-span tunnel, the tension stress zone of roof was delineated, the reinforcement scheme was proposed. This study has reference significance for similar tunnel expansion and reconstruction projects. [ABSTRACT FROM AUTHOR]