GOALI/Collaborative Research: The Integrity of Geosynthetic Elements of Waste Containment Barrier Systems Subject to Large Settlement and Seismic Loading

最后修改日期：02/25/08最后修改人：Richard J. Fragaszy 摘要本项目的目的是研究现代垃圾填埋场垃圾控制系统在垃圾沉降、地震荷载和操作荷载作用下保持其完整性的能力。研究人员还将研究设计策略和细节，以减轻这些对安全壳系统完整性的潜在威胁。垃圾填埋场是我们国家的重要组成部分吗？民用基础设施。现代垃圾填埋场依赖于由土壤和土工合成材料（即，聚合物）材料以容纳废物和废物副产物，从而保护环境。垃圾填埋场控制系统的破坏可能导致严重和代价高昂的环境影响。虽然人们广泛认识到废物沉降会对垃圾填埋场衬垫和覆盖系统施加压力，但在当前的设计实践中通常没有考虑通常与固体废物垃圾填埋场相关的大规模废物沉降对这些系统完整性的影响。地震荷载对安全壳系统完整性的影响通常以总的经验方式考虑;然而，目前的方法没有量化地震事件对安全壳系统施加的荷载。此外，内衬和盖系统元件确实发生的损坏可能是隐藏的，没有表面表达来提醒工程师、操作员、所有者或监管者注意该问题。这一合作研究项目的目标将通过以下方式实现：1）关键土工合成材料/土工合成材料和土工合成材料/土壤界面的载荷-变形行为的实验测量，包括它们在动态载荷下的响应，2）描述这些元件和界面的载荷-变形行为的现实计算模型的开发，3）计算模型的数值实现，以预测受废物沉降和地震载荷影响的废物容纳系统的行为，和4）将数值方法应用于典型的填埋场配置，以确定对填埋场衬垫和覆盖系统的完整性构成威胁的条件，并制定策略缓解这些情况。该项目有可能改变垃圾填埋场在工程实践中的设计方式。对该项目进行的研究预计将导致改进程序，评估填埋场衬垫和覆盖系统的完整性;更现实的设计方法;提高对填埋场长期可靠性的信心;改进填埋场建设程序;并改进填埋场建设中使用的土工合成材料的产品设计。不应低估更为现实和可靠的废物控制系统设计的社会效益。放弃目前在实践中使用的粗糙和基本上未经证实的设计标准，采用更合理的方法，将是填埋场设计的一个重大进步，有助于提高公众对废物控制系统的接受程度和信心。该项目部分由“与工业界学术联络的赠款机会”（GOALI）计划资助，是两个工业/学术团队之间的合作：俄亥俄州州立大学和CETCO（一家领先的土工合成材料制造商）以及亚利桑那州州立大学和Geosyntec Consultants（一家领先的地质环境咨询公司）。拟议在项目第三年举办的全球海洋环境影响倡议讲习班将向广泛的利益攸关方传播研究结果，包括美国环保局、加州综合废物管理委员会和州水资源控制委员会、土工合成材料制造商、包括主要废物管理公司和市政府在内的填埋场所有者以及环境咨询公司。

Last Modified Date: 02/25/08 Last Modified By: Richard J. Fragaszy Abstract The objective of this project is to investigate the ability of modern landfill waste containment systems to maintain their integrity when subject to waste settlement, earthquake loading, and loads from operational practices. The researchers will also examine design strategies and details to mitigate these potential threats to containment system integrity. Landfills are an essential component of our nation?s civil infrastructure. Modern landfills rely upon sophisticated engineered liner and cover systems composed of soil and geosynthetic (i.e., polymer) materials to contain the waste and waste by-products and thereby protect the environment. A breach of a landfill containment system can result in serious and costly environmental impacts. While it is widely recognized that waste settlement can apply stress to landfill liner and cover systems, the impact of the large waste settlement typically associated with solid waste landfills on the integrity of these systems is generally not considered in current design practice. The impact of seismic loading on containment system integrity is generally considered in a gross empirical fashion; however, current methods do not quantify the loads applied by a seismic event to the containment system. Furthermore, damage that does occur to liner and cover system elements may be hidden, with no surface expression to alert the engineer, operator, owner, or regulator to the problem. The objectives of this collaborative research project will be achieved through: 1) experimental measurement of the load-deformation behavior of key geosynthetic/geosynthetic and geosynthetic/soil interfaces, including their response under dynamic loading, 2) development of realistic computational models that describe the load-deformation behavior of these elements and interfaces, 3) numerical implementation of the computational models to predict the behavior of waste containment systems subject to waste settlement and seismic loads, and 4) application of the numerical method to typical landfill configurations to identify conditions that pose a threat to the integrity of landfill liner and cover systems and develop strategies for mitigating these conditions. This project has the potential to transform the way landfills are designed in engineering practice. The research conducted on this project is expected to lead to improved procedures for evaluating the integrity of landfill liner and cover systems; more realistic design methods; enhanced confidence in the long term reliability of landfills; improved landfill construction procedures; and, improved product design for geosynthetics used in landfill construction. The societal benefits of more realistic and reliable waste containment system designs should not be underestimated. Moving away from the crude and largely unsubstantiated design criterion currently used in practice and toward a more rational methodology will be a major advance in landfill design and help to enhance public acceptance of and confidence in waste containment systems. This project, funded in part under the Grant Opportunities for Academic Liaison with Industry (GOALI) program, is a collaboration between two industry/academia teams: Ohio State University and CETCO (a leading geosynthetic manufacturer) and Arizona State University and Geosyntec Consultants (a leading geoenvironmental consulting firm). The GOALI workshops proposed for the third year of the project will disseminate the research findings to a broad spectrum of stakeholders, including the USEPA, the California Integrated Waste Management Board and State Water Resources Control Board, geosynthetic manufacturers, landfill owners including major waste management firms and municipal governments, and environmental consulting firms.