Abstract：Based on the result of the measurement and in premise of formulation of tunnel layout scheme and supporting parameters,evolution rule research of tunnel was received during excavating and mining in order to provide the basis parameters for determining whether the tunnel surrounding rock were stable or not. The Hoekbrown rule,simplified“equivalent radius”and plastic equilibrium theory were used to calculate plastic zone distribution in deep buried tunnel that relationship between plastic zone and the supporting force were gained while excavating and supporting,the evolution law of GSI,P'and the plastic zone of surrounding rock in tunnel in front of the face 14 ~ 44 m affected by dynamic pressure were also calculated during face mining. The evolution rules of plastic zone of surrounding rock of tunnel were obtained by UDEC numerical simulation was similar to theoretical calculation. It shows that research on the evolution law of plastic zone of surrouding rock in the deep mining tunnel base on in-situ stress is pointed,quantitative and pratical,it can provide a reliable basis for design of tunnel layout,supporting parameters and the determination of stability of surrouding rock.

Keyword：plastic zone;deep buried tunnel;Hoek-brown criterion;UDEC;