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A Geogrid-Reinforced Timber Piled Embankment over Kettle-Fill Deposits near Chicago, Illinois

机译：伊利诺伊州芝加哥附近的水壶填土上的土工格栅加筋的木桩路堤

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A new grade separation for the Elgin O'Hare Expressway required a widening and grade increase for a 185-meter long embankment section carrying Illinois Route 53 across a series of peat bogs. The subsurface investigation showed a wetland developed over a kettle basin subsided into glacial diamicton and subsequently filled with lacustrine clay, silt and organic soils. The organic soil sequence included fibrous peat sandwiched between upper and lower layers of soft, organic-rich clay and silt. As an alternative to the costly dry-land bridge concept an alternative was proposed to place the new embankment over a 900 mm thick aggregate platform reinforced with two layers of biaxial geogrid and supported on 9- to 12-meter long timber piles. The timbers were driven 7-foot on-square center into competent glacial diamicton. The system was designed for 300 mm settlement at the top of pavement. Local excavation of the existing fill was required to achieve the critical height. High groundwater and soft ground resulted in challenging but manageable working platform conditions. Pile-driving analyzer tests confirmed capacity of timber piles and established site-specific driving criteria.
机译：埃尔金·奥黑尔（Elgin O'Hare）高速公路的新坡度分离要求对长185米的路段加宽和提高坡度，该路段承载着伊利诺伊州53号公路穿越一系列泥炭沼泽。地下调查表明，在一个水壶盆上形成了一个湿地，该盆逐渐消融成冰川的铁线虫，随后充满了湖相粘土，淤泥和有机土壤。有机土壤序列包括夹在柔软的，富含有机物的粘土和淤泥的上层和下层之间的纤维泥炭。作为昂贵的旱地桥梁概念的替代方案，提出了一种替代方案，将新路堤放置在900毫米厚的骨料平台上，该平台用两层双轴土工格栅加固，并支撑在9至12米长的木桩上。木材被驱动到7英尺的正方形中心，变成称职的冰川铁土。该系统设计用于人行道顶部300毫米的沉降。为了达到临界高度，需要对现有填充物进行局部开挖。高地下水位和软土地导致具有挑战性但可控的工作平台条件。打桩分析仪测试证实了木桩的承载能力，并建立了针对特定地点的打桩标准。

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