Analysis of Surrounding Rock Failure Characteristics and Influencing Factors of Shuangjiangkou Underground Powerhouse Under High Ground Stress
As a key upstream control reservoir project for the cascade development of hy-dropower in the Dadu River Basin,the Shuangjiangkou Hydropower Station is influenced by the conditions of mountain canyons,and the underground powerhouse has the engineer-ing characteristics of large burial depth and high ground stress.Taking the main power house as the research object,the deformation and failure characteristics of on-site sur-rounding rock during blasting excavation were statistically summarized,and the rock blas-ting mechanism and influencing factors under high ground stress conditions were explained.The research results indicate that during the blasting excavation process of the underground powerhouse of Shuangjiangkou Hydropower Station,the surrounding rock mainly undergoes four main types:plate cracks,plate like fractures,Ⅴ-shaped fractures,and stress structure synergistic failure.Among them,plate shaped fractures mainly develop on the side walls,top arches,and face of the tunnel;Plate shaped and Ⅴ-shaped fractures mainly develop at the arch shoulder,with a fracture depth generally greater than 40 cm;Under the synergistic effect of stress and structure,the surrounding rock failure re-volves around faults or joint aggregation areas,with varying scales of failure and poor pre-dictability.
underground powerhousehigh ground stressblasting excavationsurrounding rock deformation
万方数据
维普
