1983年日本海中部地震における住家被害に及ぼした地盤条件の影響について

概要

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During the 1983 Nihonkai-Chubu Earthquake, the houses built on the transition area between the sand dune and alluvial plain suffered severe damage due to liquefaction induced sand boils and ground fissures. Thereby, collapsed rate of houses on sandy ground reached 54%. Liquefaction induced by the seismic motion occurred in a layer of sandy soil, in which the thickness of non-liquefied layer (H_1) was less than that of liquefied layer(H_2)under the condition that H_1 was less than 2.0 m. Based on these investigation, estimative calulculation was attempted using two simple methods for predicting liquefaction such as a procedure of the Japanese Highway Brige Code and a method which utilized residual pore water pressure data. Results were compared with the actual occurrence of liquefaction. The results of the surveys and the analysis were 80% identical. After considering these liquefaction problems, discussion on the effectiveness of earthquake-proof construction methos of foundations and ground works executed before and after the earthquake is continued.
1994-01-31