USE OF FINITE ELEMENT METHOD IN DETERMINING STABILITY OF LARGE UNDERGROUND CAVITIES

Abstract

Underground cavities of large dimensions are usually required for construction of power houses which due to various considerations have to be located below the ground surface. Due to complexities in. the geological formations, variation in rock properties and stress pattern in the rock mass, the excavation sequence becomes a prime consideration to ensure speedy construction and utmost safety to plant and personnel at minimum cost. In this dissertaticr:, the case of Chhibro-power house cavity is considered for analysis. The effect of excavation of other cavities like anchor gallery, DTO gallery and collection gallery is also considered. The influence of rock mass anisotropy and provision of rock anchors for stability of sidewalls of power house cavity are studied in detail. It has been found that anisotropy bears significant influence on stress redistribution. The anchors in the present situation have only a limited role to play.....