The Rock Stability Analysis of Underground Powerhouse Excavation at a Power Plant

Taking the rock stability after excavation at a hydropower station as research target,and the 3-D elasto-plastic finite element analysis method as research measure,this paper analyzes and appraises the rock stability of different excavation sequences and of different support programs.Main contents include the following: using finite element method to simulate the initial stress field inversion of a underground hydropower station;the excavation of the underground powerhouse cavern group is simulated by different program using 3-D elasto-plastic finite element analysis method,and the realistically reflects the reasonableness of the parameters of the anchor support and the strengthening of rock.The results show that the cavern layout,excavation order and support parameters is reasonable,the stability of the main chamber group is good.