TY - JOUR AU - Tetsuya Okano, AU - Keita Sugito, AU - Ryoichi Fukagawa, PY - 2017/09/23 Y2 - 2024/03/29 TI - LIQUEFACTION SIMULATION FOR THE OSAKA GULF COAST USING THE LIQCA PROGRAM JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 15 IS - 47 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/810 SP - 1-6 AB - <p>A Nankai megathrust earthquake is expected to occur in the Kansai area within the next 30–40 <br>years. According to the worst-case estimations by The Headquarters for Earthquake Research Promotion [1], <br>the earthquake will cause economic losses of approximately 220 trillion yen, and 134,000 buildings will be <br>damaged by liquefaction. To estimate future damage to the Osaka gulf coast, we conduct liquefaction <br>simulations based on the LIQCA program developed by the research group at Kyoto University. The <br>liquefiable layers are composed of relatively loose sand and the underground water level is high. The input <br>earthquake motion is the L2 spectrum Ⅰ earthquake-resistant standard spectrum, according to the Design <br>Standards for Railway Structures and Commentary [2]. We consider not only the increase of excess pore <br>water pressure, but also its dissipation. The calculated effective stresses in the sand layers approached 0, after <br>which the sand layers liquefied and unevenness occurred at the ground surface. We evaluated the damage due <br>to liquefaction by calculating vertical displacements and unevenness of the ground surface. Countermeasures <br>are proposed for the shallow sand layers to reduce future liquefaction damage.</p> ER -