Studies on Sevaral Countermeasures Against Liquefaction-Induced Flow and an Applivation of a Measure to Existing Bridges in Tokyo

Abstract

ABSTRACT:In Japan, studies on liquefaction-induced flow started just after the 1983 Nihonkai-chubu earthquake and were accelerated after the 1995 Hyogoken-nambu earthquake. Several prediction and countermeasure methods have been proposed. At Metropolitan Expressway, detailed study was conducted to evaluate the safety against the flow. Then, four sites were selected to reduce the effect of the flow by applying a countermeasure. The applied method was to install steel pipes between bridge foundations and sea walls.

Earthquake Geotechnical Engineering

“…Metropolitan Expressway in Tokyo (partially quoted from Yasuda and Ogasawara, 2004;Yasuda, 2005a) On the Metropolitan Expressway in Tokyo, the Bay Shore Route and several other routes run along or cross coasts, canals, and rivers. Strengthening the ground with a wall, sand piles or densification of a small area of the ground also prevents or decreases ground flow even though liquefaction occurs in the ground.…”

Untitled

“…Countermeasures against liquefaction-induced flow behind quay walls [Kanatani et al, 2000]. [Yasuda and Ogasawara, 2004e] On the Metropolitan Expressway in Tokyo, the Bay Shore Route and several other routes run along or cross coasts, canals and rivers. There was concern that the foundations of bridges on these roads might be damaged by liquefaction-induced flow.…”

The Effect of Log Piling on Liquefaction

“…Yasuda and Ogasawara 17) evaluated a countermeasure for liquefaction that involved the installation of steel pipes, which they determined to be effective against liquefaction. Numata et al 18) analyzed wooden piles as a remedial measure against liquefaction using the 1964 Niigata earthquake as an example.…”