Abstract:Numerical emulation analysis of rock bolt crane beam in the underground powerhouse in Foziling Power Station during the construction and running periods is carried out by using elasto plastic finite element program Phase2. The influences of some factors on the underground powerhouse and the rock bolt crane beam are discussed,such as the time when the wheel loading is applied the in-situ stress field,and the mechanical characteristics of surrounding rock,Analytical results show that:(1) the crane beam has rational structure and feasible supporting parameters. The rock bolt crane beam will be stable so long as the surrounding rock is steady by itself;(2) the rock bolt crane beam can be in running period in advance and the construction schedule can be quicken when the wheel loading is applied during the construction of the powerhouse;(3) the tectonic stresses has prominent influences on bolt stresses of the crane beam,which can be greatly increased,while the maximum tension stresses in crane beam can be decreased relevantly considering the tectonic stresses;and (4) the deformation of the crane beam and the stresses of the bolt are mainly controlled by the mechanical parameters of surrounding rock.