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Working Stress Behavior of Tall Steel Mechanically Stabilized Earth (MSE) Walls

高钢机械稳定土 (MSE) 墙的工作应力行为

基本信息

批准号：
1100903
负责人：
Armin Stuedlein
金额：
$ 32.68万
依托单位：
Oregon State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2011
资助国家：
美国
起止时间：
2011-07-01 至 2016-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1100903&HistoricalAwards=false
关键词：
Working Stress Behavior Tall Steel

项目摘要

This research seeks to transform the way Mechanically Stabilized Earth (MSE) walls are analyzed, resulting in a broad impact due to: (1) the improvement in the understanding of the impact of fundamental soil behavior on the assessment of reinforced soil, mitigating the economic costs of inefficient wall design; (2) the dissemination of field performance data and implementation of advanced numerical models to assist students, practitioners, and researchers in studying the behavior of tall MSE walls; and (3) the generation of an advanced interactive visualization tool developed in collaboration with students designed for education and engineering recruitment. Tens of thousands of MSE retaining walls have been constructed in the United States since their introduction in 1972. MSE walls are being constructed to greater heights, in non-linear geometries, and with multiple tiers and tight reinforcement spacing. The use of these cost-effective reinforced soil structures will continue to grow in the U.S. due to increasing urbanization, diminishing right-of-way, and/or wetland mitigation. Despite the proliferation of wall construction and advances in materials and methods, our ability to predict the working stress behavior and displacement of tall, single and multi-tier walls is unsatisfactory. The behavior of steel MSE walls constructed to 15 meters in height, which require typical reinforcement spacing of 0.5 to 0.75 m, is not significantly affected by curvature of the Mohr Failure envelope, nor the potential for frictional interference possible with more closely spaced reinforcements. However, as steel MSE walls are constructed with much greater heights and closer reinforcement spacing, the role of soil dilation and potential frictional interference between reinforcement strips become critical. Recently, some MSE wall heights have exceeded 40 m. This research aims to determine the role of soil dilation and confining stress, and frictional interference on the development of reinforcement strains through a coordinated experimental program and numerical modeling study. These results will be used to model the field behavior observed in instrumented MSE walls reported in the literature, as well as improve design models for the determination of internal stability and displacement.The impact of this research will be experienced worldwide as the design and construction of tall MSE walls proliferates to meet society's needs. An improved understanding of the effect of soil dilation and frictional interference on the working stress behavior of steel reinforcements represents an important step towards the revolution of the analysis of tall reinforced soil walls. The dissemination of high-quality performance data, numerical model codes, and educational tools will serve society by allowing researchers, educators, and professional engineers to directly access and evaluate tall wall behavior.

本研究旨在改变机械稳定土（MSE）墙的分析方式，产生广泛的影响，原因在于：（1）提高了对基本土壤特性对加筋土评估影响的理解，减轻了低效墙设计的经济成本;（2）传播现场性能数据和实施先进的数值模型，以帮助学生，从业人员，和研究人员在研究高MSE墙的行为;和（3）与设计用于教育和工程招聘的学生合作开发的高级交互式可视化工具的生成。自1972年引入以来，美国已建造了数万座MSE挡土墙。 MSE墙被建造到更高的高度，在非线性几何形状，并与多层和紧密的钢筋间距。这些具有成本效益的加筋土结构的使用将继续在美国增长，由于城市化的增加，减少路权，和/或湿地缓解。尽管墙体建筑的扩散和材料和方法的进步，我们的能力，预测工作应力行为和位移的高大，单层和多层墙是不令人满意的。建造至15米高的MSE钢墙的性能（要求典型的钢筋间距为0.5至0.75 m）不会受到莫尔破坏包络线曲率的显著影响，也不会受到间距更近的钢筋可能产生的摩擦干扰的影响。然而，由于钢MSE墙的高度更高，钢筋间距更近，土壤膨胀和钢筋条之间的潜在摩擦干扰的作用变得至关重要。最近，一些MSE墙的高度已经超过40米。本研究旨在通过协调的实验方案和数值模拟研究，确定土壤膨胀和围压的作用，以及摩擦干扰对钢筋应变的发展。这些结果将被用来模拟在文献中报道的仪表MSE墙观察到的现场行为，以及改进设计模型，用于确定内部稳定性和displacement.The影响，这项研究将在世界范围内经历的设计和建造的高大MSE墙激增，以满足社会的需求。对土壤膨胀和摩擦干扰对钢筋工作应力行为的影响有了更好的理解，这是高层加筋土挡墙分析革命的重要一步。高质量性能数据、数值模型代码和教育工具的传播将使研究人员、教育工作者和专业工程师能够直接访问和评估高墙行为，从而为社会服务。