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，德克萨斯州奥斯汀分校的 Ellen M. Rathje、Kenneth H. Stokoe U.“合作研究：城市固体废物的静态和动态特性”在过去的 15 年里，城市固体废物填埋场 (MSW) 已从当地的“垃圾场”发展而来” 融入复杂的工程系统。 然而，尽管现代固体废物填埋场所需的工程环保系统非常复杂，并且许多系统的性能依赖于废物体的行为，但我们对城市固体废物机械行为的理解是，充其量只是初级的。 城市固体废弃物机械性能的不确定性是可靠垃圾填埋场稳定性分析、新垃圾填埋场废物遏制系统设计以及旧垃圾填埋场关闭和重建的主要限制。这项行动是为了支持一项为期三年的合作研究计划，其目标是系统评价影响城市生活垃圾填埋场静态和动态岩土性能的重要因素。 环境保护局要求美国所有垃圾填埋场的设计必须能够抵御地震。 对于具有显着地震震动潜力的地区的垃圾填埋场，设计时需要动态特性。 目前，假设动态强度特性与静态特性相同，动态刚度基于有限的小应变数据。 城市固体废弃物是一种高度异质的材料，由各种可降解（例如纸张、食物垃圾）和不可降解（例如土壤、塑料）材料组成。 虽然城市固体废物的行为可能受到废物成分和材料降解状态的影响，但对这些因素对城市固体废物静态和动态行为的影响缺乏基本了解。 因此，静态和动态分析的城市固体废弃物特性通常基于经验法则、工程判断以及少量实验室和现场测量。 本研究调查的因素包括废物成分（特别是垃圾和土壤类物质的相对比例）、废物降解和颗粒大小。 通过实验室和现场调查评估城市固体废弃物的剪切强度、压缩性和动态材料特性。 研究垃圾与土壤的比例和垃圾降解状态的影响将进一步加深我们对城市固体废物作为垃圾和土壤复合材料的基本行为的理解。 关于测试样本尺寸影响的研究旨在通过可能减少或消除未来研究中对大型测试样本和测试设备的需求，促进工程设计的进一步研究和特定地点研究。该合作项目利用了这些见解以及主要研究人员在以前的城市固体废物特征和垃圾填埋场性能研究中获得的经验。 它将增进业界对城市固体废物填埋场作为工程系统的理解，从而实现更安全、更经济的填埋场设计。 这是摆脱当前垃圾填埋场设计实践对经验法则和猜想的过度依赖的重要一步。 该项目涉及加州大学伯克利分校、德克萨斯大学奥斯汀分校和加州亨廷顿海滩 GeoSyntec Consultants 的研究人员之间的合作。