The Design And Optimization Of Pubugou Underground Powerhouse, And Numerical Simulation And Analyse Of Wall Rock's Stabilization

This paper advances a reasonable layout eptimal spouting concrete anchoragescheme and suitable excavation mode for the undenground Power house caverns ofthe Bubugou hydropower station on the Dadu River according to the characteristicsof the undenground Power house and the optinal design, analyses the stability ofsurrounding rocks of the undenground Power house for the layout schemes,supporting measures and excavation programs using three dimensionalelastico-plaastic finite element method, according to the results of numerical analysiswith the project practice puts forward the project carrying out scheme,makes theconbination of the theoretical analysis and the project practice. The main contents ofstudy in this paper are:(1). Optimal design study of undenground Power house caverns stuructures;(2). Fitted inversion of three demensional initial in situ stress field;(3). Numerical modeling analysis and stability analysis of the surrounding rocks ofthe caverns for the layout of the underground caverns and savtable excavationconstruction;(4). Study of supporting method for the underground caverns and stability analysis ofthe surrounding rocks under the supporting conditions;(5). Analysis method of three demensional rock seepage. Field and analysis ofseapage field distribution in the periods of construction and operation, stabitityanalysis of the surrounding rocks with the seepage according to the layout ofdrainage gallery and curtain grouting;(6). Comprehensive comments on the reasonableness of the structures layout,excavation mode and the supporting parameters and proposals for the project designaccording to the analysis.