Collaborative Research: Static and Dynamic Properties of Municipal Solid Waste

0220159，Edward Kavazanjian，Neven Matasovic，GeoSyntec Consultants“协作研究：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）已经从当地的“垃圾场”发展成为复杂的工程系统。 然而，尽管现代固体废物填埋场所需的工程环境保护系统的复杂性和复杂性，以及许多这些系统的性能对废物质量行为的依赖性，我们对MSW的机械行为的理解充其量是初步的。 关于城市固体废物的机械性能的不确定性是一个主要的限制性能可靠的填埋场的稳定性分析，设计的废物控制系统，为新的填埋场，关闭和重新开发的旧的填埋场。这一行动是为了支持一个为期三年的合作研究计划，其目标是系统地评估的重要因素，影响静态和动态的城市固体废物填埋场的岩土工程性质。 环境保护局要求美国所有的垃圾填埋场都要设计成能承受地震。 对于具有显著地震震动潜力的地区的填埋场，设计需要动力特性。 目前，假定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。 城市固体废物是一种高度异质的材料，由各种可降解（例如纸张、食物废物）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会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的了解。 因此，静态和动态分析的MSW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。 在这项研究中调查的因素包括废物成分（特别是相对于垃圾和土壤类材料的相对比例），废物降解，和颗粒大小。 剪切强度，压缩性，和动态材料性能的MSW进行了评估，使用实验室和现场调查。 研究垃圾与土壤的比例对垃圾降解的影响以及垃圾的降解状态，将有助于我们进一步了解垃圾作为垃圾与土壤组成的复合材料的基本行为。 对试样尺寸的影响的研究旨在通过可能减少或消除对大型试样和测试设备的需求，促进进一步的研究和工程设计的特定地点的研究。这个合作项目利用了主要研究人员在以前的城市固体废物特性和填埋场性能研究中获得的见解和经验。 它将促进业界对城市固体废物填埋场作为工程系统的理解，从而实现更安全和更经济的填埋场设计。 这是超越过度依赖的重要一步。这个合作项目利用了主要研究人员在以前的城市固体废物特性和填埋场性能研究中获得的见解和经验。 它将促进业界对城市固体废物填埋场作为工程系统的理解，从而实现更安全和更经济的填埋场设计。 这是一个重要的一步，超越了目前的垃圾填埋场设计实践中过度依赖经验法则和猜测。 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顾问公司的研究人员之间的合作。在目前的垃圾填埋场设计实践中，经验法则和推测。 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顾问公司的研究人员之间的合作。

0220159, Edward Kavazanjian, Neven Matasovic, GeoSyntec Consultants"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 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. 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.