Research Initiation: Insitu Pore Water Pressure PredictionsDuring Earthquakes

当饱和水的松散砂受到循环 强烈地震震动、过量孔隙水等荷载 如果水不容易排走， （undrained behavior）. 这种多余的孔隙压力减少了土壤 强度，如果产生足够的压力，将导致 土壤的破坏称为液化。 预测孔隙水生成的现有方法 循环加载过程中的压力经常高估压力 也就是说，它们会导致保守的预测。 这 一个研究项目正在调查土壤模型的准确性 目前用于地震孔隙水预测 的影响，特别要注意 在地震期间和地震后，这种压力的消散。 的 预测正在与实验室测试数据进行比较， 使用Owi的仪器站点进行现场测试获得的数据 日本东京湾岛。 这些数据包括地面运动时间 历史以及动态孔隙水压力测量， 松散桑迪底土中的两个深度。

When loose sands saturated with water are subjected to the cyclic loads resulting from severe earthquake shaking, excess pore water pressures are generated if the water cannot easily drain away (undrained behavior). This excess pore pressure reduces the soil strength, and if sufficient pressure is generated, will lead to a failure of the soil referred to as liquefaction. Current methods for predicting the generation of pore water pressure during cyclic loading often overpredict the pressures generated, that is, they result in conservative predictions. This research project is investigating the accuracy of soil models currently used for the prediction of earthquake-generated pore water pressures, with special attention being given to the effect of the dissipation of this pressure during and after the earthquake. The predictions are being compared with laboratory test data as well as data obtained from field tests using an instrumented site at Owi Island, Tokyo Bay, Japan. This data includes ground motion time histories as well as dynamic pore water pressure measurements at two depths in the loose sandy subsoils.