Application of Stereographic Projection in the Search of Key Block of Surrounding Rock Mass for Underground Powerhouse
The rose diagram of joint is generalized by grouping the attitude of disclosed discontinuous faces in detecting cavern and measuring point coordinate. The search of movable and key blocks of surrounding rock mass for underground powerhouse is implemented, the combinations of discontinuous faces and sliding faces, the location and the parameter of stability of movable and key blocks are obtained by used of the method of stereographic projection and vector analysis of the block theory. It is shown that the numbers of movable and key blocks in the location of downriver right side wall and vault are larger than those in other location owing to numerous discontinuous faces, and the faults of F34 and F33 play a main role in the stability of movable and key blocks. The guidance for excavation and reinforce of underground caverns is provided.
Z. C. Wang "Application of Stereographic Projection in the Search of Key Block of Surrounding Rock Mass for Underground Powerhouse", Applied Mechanics and Materials, Vols. 44-47, pp. 1189-1192, 2011