抄録
This report explains the principle and the results of measurment method, using high-frequency seismic wave and radiation transport method for making sure the position of shield tunnel under construction.
In tunnel construction with shield machine, tunnel survey with a gyrocompass, lazer beams or a optical transit is generally done to measurer the alignment.
In addition of them, during a construction, we correct the difference between the alignment by tunnel survey and the alignment by surface survey. So we have to make a boring and break the linning for check the alignment with a pendulum directly. we hope that instead of breaking the lining or changing the material in that place, generally exchanging concreat segment for steel segment, we can check the alignmemt.
Then, we adopted source location method (using high-frequency seismic wave) and radiation transport method for the survey at a power cable tunnel in KISARAZU CHIBA and estimated the precision of them. In this trail the both precision were about 20mm.
