RIMI: Behavior of Stratified Sand-Gravel Composites Under Seismic Liquefaction Conditions

“地震液化条件下层状砂砾复合材料的行为”提议的研究是对地震液化条件下层状砂砾复合材料的行为进行调查。分层土的特性将根据不同的砾石含量进行评价。研究围压变化对砂砾复合材料液化参数的影响，采用两种制样方法，即空气淋滤法（代表均匀土壤条件）和沉降法（代表层状土壤条件）。哥伦比亚特区大学的应力控制自动循环三轴试验将用于评估液化潜力。本研究的主要目的是比较不同含砾量和围压下层状和均匀砂砾复合材料在地震液化条件下的行为。这种比较将增强我们对地震液化条件下土壤行为的理解。因此，可以为分析性研究制定一个概念框架。拟议的项目不仅将为这些层状土壤的建模提供基本的进步，而且还将提高哥伦比亚特区大学土木工程项目的研究能力。学生接触实验将提高少数民族在工程学科的代表性。＊＊＊

HRD-9627989 University of District of Columbia "Behavior of Stratified Sand-Gravel Composites Under Seismic Liquefaction Conditions" The proposed research is to provide an investigation of the behavior of stratified sand-gravel composites under seismic liquefaction conditions. The behavior of stratified soils will be evaluated for different gravel contents. The effect of variation of confining pressure on the liquefaction parameters of sand-gravel composites will be investigated for two methods of sample preparation, namely pluviation through air (representing uniform soil conditions) and sedimentation (representing layered soil conditions). The stress-controlled automated cyclic triaxial tests at the University of the District of Columbia will be used for the purpose of evaluating liquefaction potential. The primary objective of the proposed study is compare the behavior of stratified and homogeneous sand-gravel composites under seismic liquefaction conditions for various gravel contents and confining pressures. Such comparison will enhance our understanding of soil behavior under seismic liquefaction conditions. As a result, a conceptual framework for analytical studies can be made. The proposed project will only provide a fundamental advancement for modelling these layered soils, but also improve the research capability of the civil engineering program at the University of the District of Columbia. Student exposure to the experiments will enhance the representation of minorities in engineering disciplines. ***