Establishment of the system for the risk evaluation of geohazards at volcanic soil slope in cold regions

从土力学的角度阐明了寒区火山土地基冻融破坏的各种因素之间的相互作用，并考虑到岩土材料冻融变形强度特性的退化，提出了一种新的融雪季节降雨诱发边坡破坏的简易预测方法。我们还开发了一个地质信息数据库，集成了各种不同的信息，如天气预报、岩土信息和过去地质灾害的记录。在此基础上，将上述预测方法与地理信息数据库相结合，开发了基于上述预测方法和地理信息数据库的冻融亚表层降雨崩塌风险评价系统。

We elucidated the interaction between various factors which caused subsurface failure of volcanic soil ground subjected to freeze-thaw action in cold regions in terms of soil mechanics, and we proposed a new simple prediction method for the rain-induced slope failure in snow-melting seasons in consideration of the degradation of deformation-strength characteristics of geomaterials due to freeze-thawing. We also developed a geo-information database which integrated the various different kinds of information such as weather reports, geotechnical information, and records for past geohazards. Based on these achievements, finally, we developed the system which could evaluate a risk of rain-induced slope failure at subsurface layers suffered from freeze-thaw by using both above-mentioned prediction method and geo-information database.