Prediction of Pore Pressure Generation in Soil Foundations Using Data from Molikpaq I-65: II

该研究计划的目的是评估几个 不同的方法预测孔隙水压力恢复， 饱和无粘性土在循环剪应力作用下的力学性能。 这种应力是由于强烈的地面运动而产生的 一场大地震造成的。 孔隙水压力的增加会导致 建筑物的基础，以及地下生命线，如水， 下水道，电力和通讯的生命线造成损害的原因是 当孔隙压力达到临界值时， 水平因此，能够预测发电量非常重要 孔隙水压力，和潜在的土壤渗透。 在预测方法的发展方面已经付出了相当大的努力， 但由于缺乏对这些方法的验证， 来检验它们。 1986年4月12日，一个油气勘探岛Molikpaq 在博福特海，受到冰负荷， 这是一个预测，并导致砂芯部分膨胀。的 该沙岛的结构性能由 所有者，海湾加拿大，因此，一个很好的数据集存在对 检查方法 建议用于计算孔隙压力生成， 液化该数据集可用于研究 目的，并已启动了一项研究计划， 以下加拿大政府组织： 调查，国家海洋发展小组委员会 研究理事会的岩土研究联合委员会， 以及能源研究和发展小组。一项类似的研究 美国国家科学基金会的支持下， 与加拿大倡议协调。 伊德里斯博士森胁博士和北江博士 伍德沃德-克莱德大学的Seed教授 加州伯克利分校的多布里教授 理工学院是这项研究的一部分。它正在评估一个 现时有哪些方法可以预测 液化考虑三维效应， 三维和二维等效线性动力学 频域有限元分析。主要 对土体中的孔压增长进行了分析 采用二维非线性有限差分法。 加拿大和NSF的研究结果将 1988年8月在温哥华举行的一次研讨会上提出。

The objective of this research program is to evaluate several different methods for predicting pore water pressure buildup in saturated cohesionless soils when subjected to cyclic shear stresses. Such stresses are generated as a result of the strong ground motions resulting from a large earthquake. The buildup in pore water pressure can result in the failure of building foundations, as well as of underground lifelines such as water, sewer, power, and telecommunication lifelines. The damage results from the liquefaction of the soil when the pore pressure reaches a critical level. Thus, it is very important to be able to predict the generation of pore water pressure, and the potential for the soil to liquefy. Considerable effort has gone into the development of prediction methods, but the validation of these methods is far from complete due to a lack of data against which to check them. In April 12, 1986, the Molikpaq, a hydrocarbon exploration island in the Beaufort Sea, was subjected to ice loads which had not been predicted, and which caused the sand core to partially liquefy. The structural performance of this sand island was closely monitored by the owner, Gulf Canada, and as a result, an excellent data set exist against which to check the methods proposed for calculating pore pressure generation and liquefaction. This data set is being made available for research purposes, and a research program has been initiated by the following Canadian Government organizations: The Geological Survey, the Subcommittee on Marine Development of the National Research Council's Associate Committee on Geotechnical Research, and the Panel on Energy Research and Development. A similar study supported by the National Science Foundation is closely coordinated with the Canadian initiative. This joint effort between Drs. Idriss, Moriwaki, and Beikae at Woodward-Clyde and Professor Seed at the University of California at Berkeley, and Professor Dobry at Rensselaer Polytechnic Institute is part of this study. It is evaluating one of the existing methods for predicting the occurrence of liquefaction. Three-dimensional effects are considered using three-dimensional and two-dimensional equivalent-linear dynamic finite element analyses in the frequency domain. The main analysis for the pore pressure increase in soils is performed using a two-dimensional nonlinear finite difference method. The results from both the Canadian and NSF studies will be presented at a workshop to be held in Vancouver in August, 1988.