| Popis: |
In the process of large-span tunnel excavation by arch cover method, how to ensure the safety of construction and to reduce the influence on the surroundings and environment has arising wide attention of scholars both domestic and abroad. But now it is still in the stage of experience as to the rock pressure and its instability failure, especially to the research on rock overload damage. Regarding the large-span tunnel rock failure mechanism of progressive collapse by arch cover method, large-diameter modeling test are adopted to do systematical research on the rock failure phenomena as load increase. Determine its ultimate failure state by increasing vertical load, then we can get its failure characteristics and instability criterion in different rock support section. |
