Inversion analysis of in situ stress field in underground cavern of hydropower station
In the calculation of the stability of surrounding rock in the underground caverns,the study area of underground stress is usually large.However,the information of known parameters is limited;therefore the numerical analysis results on this basis can result in some deviations from the reality.Based on the measured data of underground stress and geological structure,and improved particle swarm optimization algorithm,an inversion model of the initial stress field was developed.The inversion results were in good agreement with the measured results,which can provide reference for the further analysis of the surrounding rock stability in the plant area.