Arch Shape Optimization of Large Caverns Under High Land Stress
Shi Guangbin(1,2),Li Ning(1)
(1 Xi'an University of Technology ,Xi'an 710048) (2 Northwest Investigat ion Design & Research Institute , Xi'an 710065)

Abstract: Excavation of lager cavern in high stress domain leads to a stress-concentration and widened plastic-area, so the probability of rock burst, and uns tability of rock mass are obviosly increased. Taken a lage underground power house as an example, the influences of 3 different shapes arches on the nearby stress distribution are analyzed in detail. The computional results indicate the remarkable effects that the highest stress concentration coefficient even reaches to 3.33; and the concentration is unavoidable whatever the arch shapes are, the ellipse shaped arch is regarded as the best.
Keywords: high land stress, large cavern, arch shape optimization, the finite element, principle of energy dissipation.