THE DISPLACEMENT OF NON-LIQUEFIABLE GROUND IN NEAR FIELD RELATED TO THE DAMAGE OF BURIED PIPELINES

Abstract

Damage to buried water-supply pipelines in the non-liquefiable ground from the 1995 Hyogoken-Nambu earthquake was first compared with calculation results from the relevant seismic design code. The results showed that the damage occurred even if there was a margin of safety of about 2. In addition, the earthquake-induced displacement of the non-liquefiable ground was next evaluated using results from survey, strong motion observation and numerical simulation in the near field of the 1995 earthquake. It was found that the dynamic displacement and the permanent displacement were significant not only on the surface layer but also at the engineering bedrock.