ground displacement absorbing seismic isolation structure

摘要

PROBLEM TO BE SOLVED: To provide a ground displacement absorbing base isolation structure in which prolonged stability of an underground base isolation wall is secured and stress acting on an underground structure such as an open-cut tunnel at the time of an earthquake is reduced.;SOLUTION: The present invention is an underground base isolation wall 4 which has a continuous wall structure made of a clay-based material with a water swelling property and is placed between an underground structure 2 and the surrounding ground. The underground base isolation wall 4 has a width D of 0.2 to 2.5 m and is made of the clay-based material which is a mixture of bentonite and water having a bentonite effective dry density of 300 to 1200 kg/m³ in a region filled with the mixture.;COPYRIGHT: (C)2012,JPO&INPIT