Secondly according to the theory and situ measurement,analyzed the deep displacement of surrounding rock and ground surface settlement the excavation of tunnel,derived the principles of temporal and spatial effects.

Based on dynamic damage variable and internal displacement of surrounding rock,combining with the monitoring results of Damaoshan tunnel,accumulative damage effects of interlaid rock in tunnel groups with small clear distance are studied.

After the excavation of powerhouse system, we monitored that the displacement of surrounding rock increases quickly and its space displacement is obvious.

According to the large quantity of in situ measured data,the characteristics and variation laws of displacement and load of bolts in the surrounding rock are studied,and the factors which influence the displacement of surrounding rock and the load along bolts are analyzed as well.

Forecasting evolution of tunnel surrounding rock displacement by ε-SVR;

A method of predicting surrounding rock displacement is set up by using the RBF nerve network s function of powerful nonlinear mapping and fast convergence rate, in which the monitoring data of surrounding rock displacement are chosen.

According to construction,design and on-site conditions,authors firstly set up finite element model of a tunnel,and then describe the distribution of surrounding rock displacement.