ABSTRACT

This paper reports the monitoring result and conclusions regarding the effects that is caused by new tunnel against the existing tunnel, when it is constructed nearby. The following results have been confirmed from the monitoring data.

Total thrust of shield machine, slurry pressure, and pressure of tail grout during excavation does not effect so much to the existing tunnel. The most of the increasing strain is caused by soil pressure relieve after passing shield machine. The effect caused by soil pressure relieve can be assumed by elastic analysis.