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

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。 罗格斯大学和教授之间的联合努力。 普林斯顿大学的普雷沃斯特是这项研究的一部分。耦合 动态场方程计算孔隙流体和土壤骨架 同时响应，说明 这两个阶段。多屈服面塑性用于 精确模拟土壤的非线性、滞后行为 骷髅数值计算使用 通用三维非线性有限元 程序. 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 the Rutgers University and Prof. Prevost at Princeton University, is part of this study. Coupled dynamic field equations calculate pore fluid and soil skeleton response concurrently, accounting for dynamic interaction between the two phases. Multi-yield surface plasticity is used to accurately model the nonlinear, hysteretic behavior of the soil skeleton. The numerical calculations are performed using a general purpose, three-dimensional nonlinear finite element program. The results from both the Canadian and NSF studies will be presented at a workshop to be held in Vancouver in August, 1988.