Through the innovative use of a reinforced soil wall system up to 52 feet high, the capacity of an existing double-composite lined ashfill was significantly increased. By raising the toe of the ashfill on two sides, the opposite sides of the ashfill could be laterally expanded over an existing closed landfill. The footprint area was increased from 6 to 10 acres and the airspace volume was increased by over 280 percent. The paper presents design methodologies, special considerations used in the layout, and photographic documentation during the construction of the expansion. The Northern U Ashfill is located on the site of the Town of Babylon Landfill in Suffolk County, Long Island, New York. The site is an inactive Class II hazardous waste landfill and covers approximately 47 acres. The Northern U Ashfill is located within a "U" shaped area at the northern perimeter of the landfill. As originally constructed, the Northern U abutted the lower 30 vertical feet of the landfill slopes. In 1999, the design capacity of the ashfill was exhausted. In order for the Town to continue ash disposal past June 2002, an expansion of the Northern U was required. In consultation with the state regulators, a reinforced soil wall system was chosen as the most viable vertical expansion alternative for the ashfill. The reinforced soil wall system had the added benefit of allowing a lateral expansion over an additional 80 vertical feet of the existing landfill slope. The calculated benefit (value of additional air space) to cost (design and construction of reinforced soil wall) ratio is greater than 10:1. With the expansion, the Town will have ashfill airspace until 2007. The paper describes the design aspects of the two-tiered reinforced soil wall system. Both seismic and static slope stability analyses and results are discussed. The tie-in of the wall to the existing double-composite liner system and the wall tie-in the final cover system is illustrated. Other unique aspects of the wall construction as it was built are described. Construction of the reinforced soil wall system was completed in early 2002.
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机译：通过创新性地使用高达52英尺高的加筋土墙系统，大大提高了现有的双层复合衬砌灰渣的容量。通过在两侧提高垃圾填埋场的脚趾，可以将垃圾填埋场的相对两侧横向扩展到现有的封闭垃圾填埋场上。占地面积从6英亩增加到10英亩，空域体积增加了280％以上。本文介绍了设计方法，布局中使用的特殊注意事项以及扩建期间的摄影文件。 Northern U Ashfill位于纽约长岛萨福克县的巴比伦垃圾填埋场。该场地是一个不活跃的II类危险废物填埋场，占地约47英亩。北部的U Ashfill位于垃圾填埋场北部的“ U”形区域内。按照最初的建造方式，北U边与填埋场斜坡的下30英尺垂直相邻。 1999年，灰渣的设计能力耗尽。为了使该镇在2002年6月后继续处理灰渣，需要扩建北部U。经与州监管机构协商，选择了加筋土墙系统作为灰烬填埋最可行的垂直扩展替代方案。加筋的土墙系统的另一个好处是可以在现有垃圾填埋场坡度的另外80个垂直英尺上横向扩展。计算得出的收益（额外空气空间的价值）与成本（加筋土墙的设计和建造）之比大于10：1。随着扩建，该镇将在2007年之前拥有灰烬领空。本文描述了两层加筋土墙系统的设计方面。讨论了地震和静态边坡稳定性分析和结果。示出了墙与现有双复合衬里系统的结合以及墙与最终覆盖系统的结合。描述了墙壁结构在建造时的其他独特方面。加筋土墙系统的建设已于2002年初完成。
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