Cavern tunnel diseases

mostly forming underground stress field under the action of damage

seepage

temperature and other factors

are very complicated nonlinear coupling process. In this paper

the author employs the stimulate- response coupling system being made up of Bui damage model and seepage field

the result shows that the diseases will form obviously when the coupling strength factor is about 0.5

with the cranny expanding and the damage increasing in the surrounding rock

the plastic Radius of underground rock is increasing with the porous hydraulic pressure

it speeds up the appearance of tunnel diseases. It has some positive significance to prove up the coupling mechanism

the repair and the the protection of the cavern tunnel.