INVESTIGATIVE ASSESSMENT OF THE DRILLED SHAFTS INSTALLED SHORTLY BEFORE THE SOUTHERN HYOGO-KEN（KOBE） EARTHQUAKE OF JANUARY 17,1995(1996)
T.HORIGUCHI（GEOTOP)・MADAN B.KARKEE（GEOTOP)・Ｔ.SAKAI（GEOTOP） and H.KISHIDA（Science University of Tokyo）
■発行所：Elsevier Science Ltd
Investigations were carried out as part of a post-earthquake investigation of the construction work in progress to assess the integrity of the drilled shafts installed three days before the Osaka-Kobe region of Japan was struck by the devastating earthquake on January 17, 1995. A combination of the newly developed mid-range method of stress-wave measurement and analysis, in combination with the nonlinear ground response and pile-soil interaction analysis using a recorded earthquake motion scaled to account for the epicentral distance is utilized to show that the drilled shafts were not unduly affected in this case. The effectiveness of the methodology in the post-earthquake assessment of drilled shafts for possible adverse effects not readily discernible otherwise is demonstrated.