Workshop on Seismic Design of Solid Waste Landfills

新的联邦城市固体废物填埋设施最低设计标准（MSWLF）于1993年10月9日生效。这些标准，如EPA（环境保护署）城市固体废物填埋场标准中规定的，包括抗震的最低设计标准。对于希望评估城市固体废物填埋设施的地震反应的工程师来说，关于城市固体废物密封系统的动态材料特性或固体废物填埋场在地震载荷下的性能的信息很少。此外，在建立固体废物收容设施的抗震性能标准方面几乎没有指导。新的联邦城市固体废物填埋设施设计标准，被称为资源保护和回收法案的副标题D，在两个方面影响了垃圾填埋场的抗震设计。首先，标准要求在设计垃圾填埋场时，应考虑岩石层的水平峰值地面加速度，并且在250年内超过10%的概率。这一规定导致加州部分地区的设计加速度超过0.6g，美国许多地区，包括东海岸和美国中部的大片地区，设计加速度超过0.2g。其次，标准要求垃圾填埋场底部内衬复合衬垫，包括土工膜和2英尺厚的土壤层，渗透性低于每秒10-7厘米。这一规定实际上保证了填埋场底部的低抗剪强度。在美国西部、中部和东部的许多地区，高地震激励和低剪切阻力的结合使得考虑地震反应成为垃圾填埋场设计的一个重要方面。在洛杉矶的南加州地震中心举行了一个研讨会，以检查这些新的联邦法规的影响。讲习班的主要成果将是确定和确定改进固体废物填埋场地震分析和设计所需的研究的优先次序。工作坊的成果预期将透过参加者之间的资讯交流和互动，大大增加有关堆填区抗震设计和性能的现有知识基础。研讨会的会议记录将提供对技术状况、实践状况和研究需求的简要总结。＊＊＊

9317931 Martin New Federal minimum design standards for Municipal Solid Waste Landfill Facilities (MSWLF) take effect on October 9, 1993. These standards, as specified in the EPA (Environmental Protection Agency) criteria for municipal solid waste landfills, include minimum design standards for seismic resistance. Little information on the dynamic material properties of municipal solid waste containment systems, or on the performance of solid waste landfills subjected to earthquake loading, is available to the engineer wishing to evaluate the seismic response of Municipal Solid Waste Landfill Facilities. Furthermore, little guidance is available for establishing seismic performance criteria for solid waste containment facilities. The new Federal Municipal Solid Waste Landfill Facilities design standards, know as Subtitle D of the Resource Conservation and Recovery Act, impact the seismic design of landfills in two ways. First, the standards require that landfills be designed for a horizontal peak ground acceleration in lithified rock with a probability of exceedance of 10 percent in 250 years. This provision results in design accelerations in excess of 0.6g in parts of California and 0.2g in many areas of the United States, including large areas on the East Coast and in the Central United States. Second, the standards require that landfills be lined at the base with a composite liner that includes a geomembrane and a 2 foot thick layer of soil with a permeability of less that 10-7 centimeters per second. This provision virtually guarantees a low shear strength at the bottom of the landfill. This combination of a high seismic excitation and a low shear resistance at the base of the landfill make consideration of seismic response an important facet of landfill design in many areas of the Western, Central and Eastern United States. A workshop is being held at the Southern California Earthquake Center in Los Angeles to examine the impact of these new Federa l regulations. The primary results of the workshop will be identification and prioritization of research needed to improve seismic analyses and design of solid waste landfills. The results of the workshop are expected to significantly increase the existing knowledge base on seismic design and performance of landfills through the exchange of information and interaction between workshop participants. The proceedings of the workshop will provide a succinct summary of the state of the art, the state of practice, and the research needs. ***