Strength Evaluation of Cohesionless Soils with Oversize Particles

目标和相关性：本项目为华盛顿州立大学土木工程系Richard J. Fragaszy博士和巴基斯坦水资源研究委员会（PCRWR）的Farhat H. Siddiqi博士的合作提供支持。这两位科学家计划研究和评估现有的模型，以预测含有超大颗粒的土壤的静态和循环强度行为。他们计划测试选定的原型土样品，这些样品具有各种最大尺寸的颗粒，类似于填土地基和填土大坝中使用的颗粒。他们计划研究颗粒形状和淤泥/粘土含量对材料性能的影响。将在华盛顿州立大学对直径6英寸的样品进行静力和循环试验。所有土壤分类试验以及直径1.4英寸和2.8英寸的模塑样品的静力和循环试验将在巴基斯坦进行。美巴项目支持参与者能力互补的联合项目，研究领域对两国都很重要。这个项目很好地满足了这些标准。优点：该项目对巴基斯坦来说非常重要，因为巴基斯坦用于灌溉和发电的大型水坝通常是用土材料建造的。更好地了解这些材料的强度有助于改进结构的设计。在美国，这些结果对那些设计运河和堤防或设计地震条件下的结构的人有益。这位巴基斯坦科学家在加州大学戴维斯分校和伯克利分校研究这个问题，并提出了具体的建模假设，这些假设将在本项目中进行测试。这位美国科学家正积极从事这一领域的研究。该项目可能会加强巴基斯坦和美国在科学和工程方面的合作。资助：本项目由两项拨款资助：INT8711042向华盛顿州立大学提供的资金如下：87财年来自ECES的22,000美元加上13,079美元，88财年来自SFC的2,500美元来自ECES的22,000美元加上89财年来自INT的13,079美元来自ECES的22,000美元加上INT 2的13,079美元。INT8715355向巴基斯坦水资源研究委员会提供：87财年SFC，来自INT的30,000美元。

Objectives and Relevancy: This project provides support for collaboration by Dr. Richard J. Fragaszy of the Department of Civil Engineering, Washington State University, Pullman, WA, and Dr. Farhat H. Siddiqi of the Pakistan Council of Research in Water Resources (PCRWR), Islamabad, Pakistan. The two scientists plan to study and evaluate existing models for predicting static and cyclic strength behavior of soils containing oversized particles. They plan to test specimens of selected prototype soils with various maximum size particles similar to those used in earth-filled foundations and earth-filled dams. They plan to study the effects of grain shape and silt/clay content on material behavior. Static and cyclic tests on 6 inch diameter specimens will be conducted at Washington State Univ. All soil classification tests as well as static and cyclic tests for the molded specimens of 1.4 and 2.8 inch diameter will be conducted in Pakistan. The U.S.-Pakistan Program supports joint projects where the capabilities of the participants complement each other, and the research area is important to both countries. This project meets these criteria well. Merit: The project is quite important to Pakistan where large dams for irrigation and for power generation are usually built of earth materials. A better understanding of the strength of these materials can help improve the design of the structures. In the U.S. the results can benefit those designing canals and embankments or designing structures for earthquake conditions. The Pakistani scientist has worked on this problem while at the University of California, Davis and Berkeley, and has developed specific modeling hypotheses which will be tested in this project. The U.S. scientist is actively engaged in this area of research. The project is likely to strengthen the collaboration between Pakistan and the U.S. in science and engineering. Funding: The project is being funded under two grants: 1. INT8711042 to Washington State University as follows: FY87 U.S. $22,000 from ECES plus U.S.$13,079, and SFC$2,500 from INT FY88 U.S. $22,000 from ECES plus U.S.$13,079 from INT FY89 U.S. $22,000 from ECES plus U.S.$13,079 from INT 2. INT8715355 to Pakistan Council of Research in Water Resources: FY87 SFC$30,000 from INT.