Abstract
In grouting the openings behind the lining of mountain tunnels. there are two subjects for efficiently and safety work. You need a quantitative evaluation of the influence of the openings behind the lining on seismic performance and you need the appropriate construction method of the grouting. On this study we examined the influence of the range of the openings and the lack of the lining thickness on the seismic performance. And next, we measure the injection pressure acting on the lining by experiment, and we examined the appropriate construction method of the grouting by numerical analysis using the results of the experiment. Then, in the opening's range of 60 degrees to 90 degrees, loss of seismic performance is remarkable, and the strength is further reduced by the lack of the thickness of the lining. And last, in the case of the thickness is thinner than designed, here is a possibility that lining is destroyed by the injection pressure. but it is possible to low the injection pressure acting on the lining by shorting the arrangement pitch of the pipes for grouting.
