Collaborative Research: Static and Dynamic Properties of Municipal Solid Waste

合作研究：城市固体废物的静态和动态特性

• 批准号: 0219834
• 负责人: Ellen Rathje
• 金额: $ 19.63万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-15 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0219834&HistoricalAwards=false
• 关键词: Collaborative; Research; Static; Dynamic; Properties

0219834, Ellen M. Rathje, Kenneth H. Stokoe U. of Texas-Austin"Collaborative Research: Static and Dynamic Properties of Municipal Solid Waste"Over the past 15 years, municipal solid-waste landfills (MSW) have evolved from local "dumps" into sophisticated engineered systems. Yet, despite the sophistication and complexity of the engineered environmental protection systems required at modern solid-waste landfills, and the dependence of the performance of many of these systems on the behavior of the waste mass, our understanding of the mechanical behavior of MSW is, at best, rudimentary. Uncertainty regarding MSW mechanical properties is a major limitation on performance of reliable landfill stability analyses, the design of waste containment systems for new landfills, and the closure and redevelopment of old landfills.This action is to support a three-year collaborative research program whose objective is to evaluate systematically the significant factors that influence the static and dynamic geotechnical properties of municipal solid-waste landfills. The Environmental Protection Agency requires that all landfills in the United States be designed to withstand earthquakes. For landfills in areas having significant seismic shaking potential, the dynamic properties are needed for design. Currently, dynamic strength properties are assumed to be the same as the static properties, and dynamic stiffness is based on limited small strain data. MSW is a highly heterogeneous material composed of various degradable (e.g. paper, food waste) and non-degradable (e.g. soil, plastic) materials. While the behavior of MSW is likely to be influenced by waste composition and the state of material degradation, a fundamental understanding of the influence of these factors on the static and dynamic behavior of MSW is lacking. As a result, MSW properties for static and dynamic analysis are typically based upon rules of thumb, engineering judgment, and a handful of laboratory and field measurements. Factors being investigated in this study include waste composition (particularly with respect to the relative proportions of refuse and soil-like materials), waste degradation, and particle size. Shear strength, compressibility, and dynamic material properties of MSW are evaluated using laboratory and field investigations. Research on the influence of the refuse-to-soil ratio and on the state of waste degradation will further our understanding of the fundamental behavior of MSW as a composite material composed of refuse and soil. Research on the influence of test specimen size is intended to facilitate both further research and site-specific studies for engineering design by possibly reducing or eliminating the need for large-sized test specimens and testing devices in future studies.This collaborative project capitalizes on the insights and experienced gained by the principal investigators on previous studies of MSW characterization and landfill performance. It will advance the profession's understanding of MSW landfills as engineered systems, leading to safer and more economical landfill designs. It is an important step in moving beyond the over-reliance in current landfill design practice on rules of thumb and conjecture. This project involves collaboration between researchers at the University of California - Berkeley, the University of Texas - Austin, and GeoSyntec Consultants in Huntington Beach, California.

0219834，Ellen M. Rathje，Texas-Austin的Kenneth H. Stokoe U.“合作研究：市政固体废物的静态和动态特性”在过去15年中，市政固体废物垃圾填埋场（MSW）已从“本地工程”中进化为精致的工程系统。 然而，尽管现代固体废物垃圾填埋场所需的工程环境保护系统的复杂性和复杂性，以及许多此类系统对废物质量行为的性能的依赖，但我们对MSW机械行为的理解充其量是宗主的。 关于MSW机械性能的不确定性是对可靠垃圾填埋场稳定性分析的性能，新垃圾填埋场的废物遏制系统的设计的主要局限性，以及旧垃圾填埋场的封闭和重建。这项行动是支持一个为期三年的协作研究计划，该计划的目标旨在系统地评估静态和动态范围的重要因素。 环境保护局要求美国所有垃圾填埋场都必须承受地震。 对于具有巨大地震震动潜力的地区的垃圾填埋场，设计需要动态特性。 当前，假定动态强度特性与静态特性相同，并且动态刚度基于有限的小应变数据。 MSW是一种高度异构材料，由各种可降解（例如纸，食物浪费）和不可降解（例如土壤，塑料）材料组成。 尽管MSW的行为可能受废物组成和材料降解状态的影响，但缺乏对这些因素对MSW静态和动态行为的影响的基本理解。 结果，用于静态和动态分析的MSW属性通常基于经验规则，工程判断和少数实验室和现场测量。 在这项研究中研究的因素包括废物组成（尤其是关于垃圾和类似土壤的材料的相对比例），废物降解和粒径。 使用实验室和现场调查评估MSW的剪切强度，可压缩性和动态材料特性。 研究垃圾与土壤比和废物降解状态的影响将进一步了解MSW作为由垃圾和土壤组成的复合材料的基本行为。 关于测试样品大小的影响的研究旨在通过减少或消除对未来研究的大型测试标本和测试设备的需求，从而促进进一步的研究和针对工程设计的现场研究。该协作预测资本利用了洞察力，并经历了先前的MSW表征和土地填充和地板表征的研究。 它将推动该行业作为工程系统的MSW垃圾填埋场的理解，从而导致更安全，更经济的垃圾填埋场设计。 这是超越当前垃圾填埋场设计实践的过度依赖的重要一步，对经验和猜想的规则。 该项目涉及加利福尼亚大学伯克利分校，德克萨斯大学 - 奥斯汀大学和加利福尼亚州亨廷顿海滩的Geosyntec顾问之间的合作。