Study on the Mechanism of the Liquefaction-Induced Differential Settlement of Timber Houses Occurred During the 2000 Tottoriken-Seibu Earthquake

Abstract eng:
The 2000 Tottoriken-seibu earthquake with a magnitude of 7.3 occurred in west Japan on September 6, 2000. In a housing development, named Abehikona, more than 100 timber houses settled and tilted due to liquefaction. No severe cracks were observed on the walls of the settled houses. This housing development was constructed by filling mainly granite-origin sand. Reclaimed and alluvial sand layers are deposited from the ground surface to the depth of about 7 m. After the earthquake, angles of inclination of the settled houses were measured. The maximum angle of tilting and the maximum differential settlement in Abehikona housing development were 37.5/1000 and 33 cm, respectively In the heavily tilted houses, inhabitants felt giddy and nausea, and could not live in the houses after the earthquake, though walls, pillars and windows of the houses had no damage. Then heavily tilted houses had no choice but to restore to become horizontal. According to measured inclination of the houses at Abehikona, there was a tendency that two adjacent houses tilt towards the inside of the houses. The authors carried out several analyses by ALID/win, to demonstrate the effect of several factors, such as distance between adjacent houses, groundwater level, depth of liquefaction layer, FL, RL, on the differential settlement. In the analyses the ground at Abehikona housing lot was modeled. Analyzed results showed that differential settlement is influenced by the above mentioned factors.

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