Proposal for management of investigation boring work using microtremor data

- From prediction of drilling depth to adequacy evaluation for engineering bedrocks -

Abstract

When an investigation drilling work is operated in the area with less survey data in the past, we have suggested the management method for the investigation drilling work using microtremor data that can be easily observed, and illustrated the effectiveness of the method by applying to some test sites. Using both H/V spectral ratio and surface wave phase velocity of microtremor, we have estimated the depth of engineering bedrocks (drilling depth) in advance, and we have drafted the work plan for drilling. While drilling, the investigation management has made possible by reviewing a prior estimate from drilling data. On the occasion of drilling completion, we have been able to evaluate the adequacy for the engineering bedrocks.