The E-Plastic limit balanced analysis on wall rock containing water of deep tunnel

After digging tunnel in rock body,the wall rock containing water presents raw stress because the role has disturbed rock stress distribution and the infiltrative action of hydraulic pressure,the unbalanced stress is major source for producing warp,displacement and even destroyment.Taking circular section tunnel as an example,the stability of limit balance and critical support force of underground deep tunnel were analysed and calculated based on mohr-coulomb and elastic-plasticity theory.The theoretical foundation was established for actual underground project and support engineering.