A study on risk evaluation of landslides induced by combined effects of earthquake and rainfall, based on geotechnical testing as well as strong ground motion assessment in the mountain slopes

本研究的目的是促进新的方法的风险评估地震和降雨的联合作用引起的滑坡，岩土工程试验，可以重现任何滑动面条件，以及最近先进的强地面运动评估预测的斜坡。我们在日本和其他国家的各种滑坡现场进行了实地调查，包括2008年的岩手-宫城内陆地震。取样土壤进行测试，以检查地下水和其他边坡条件对滑动面液化（SSL）的潜力的影响。滑带土是滑坡快速、长距离运动的关键机制。这些成果包括这些新的发现，其中包括，显着的极高的流动性，可以预期，即使在非饱和地基材料在强烈的地面运动引起一定的剪切位移。这些将有助于对受地震事件和降雨/地下水条件综合影响的滑坡进行实际灾害测绘的新方法。

This study aims to promote new methodology of risk evaluation of landslides induced by combined effects of earthquake and rainfall, based on geotechnical testing which can reproduce any sliding surface condition as well as recent advanced strong ground motion assessment prediction in the slopes. We conducted field investigation in various landslide sites in Japan and other countries including the 2008 Iwate-Miyagi Nairiku Earthquake. Sampled soils were subjected to testing for examining the effects of ground water and other slope conditions on the Sliding-Surface Liquefaction (SSL) potential. SSL is the key mechanism of landslide rapid and long run-out movements. The achievements includes those new findings including that, significant extremely high mobility could be expected even in unsaturated ground material under strong ground motion causing certain shear displacement. Those shall contribute to new methodologies of practical hazard mapping of landslides affected by combined effects of earthquake events and rainfall/ground water conditions.