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首页> 外文会议>Annual highway geology symposium >Emergency Slope Stabilization, Catskill Creek Bridge, New York State Thruway, Catskill, New York
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Emergency Slope Stabilization, Catskill Creek Bridge, New York State Thruway, Catskill, New York

机译：紧急斜坡稳定，卡茨基尔溪大桥，纽约州高速公路，卡茨基尔，纽约

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In response to flooding/ scour damage from Tropical Storm Irene in late August 2011, the New York State Thruway Authority and Golder prepared emergency slope mitigation designs for two slope failure areas in the southern embankment beneath the Catskill Creek Bridge on 1-87 south of Albany. Regional catastrophic flooding occurred in the region on August 28, 2011 from Tropical Storm Irene. Based on United States Geological Survey (USGS) stream gauging data, the water level in Catskill Creek rose at least 25 feet during flooding from Irene. Following this event, Thruway personnel inspected the bridge foundations, and discovered recent scour of embankment fill, riprap and other soils surrounding the piers north and south of the streambed. The scour included loss of riprap and soils adjacent to the east footing of Pier 3 on the south side of the northbound truss. The scour compromised the pier foundation as well as a large portion of the slope supporting the southeast approach of the northbound structure. Shortly after discovering the damage, site visits were conducted to initially evaluate the scour damage adjacent to the pier and collect site geologic/geotechnical field data. During one site visit, a larger landslide failure surface was noted, along with tension cracks at the head of the southern bridge approach embankment. To evaluate potential mitigation approaches, the project team reviewed site geology and geotechnical conditions using the original highway/bridge design borings; conducted back-analysis of the failure modes to estimate geotechnical conditions; developed conceptual slope mitigation concepts, inclusive of the Thruway's design for oversize riprap for scour mitigation; developed a soil nail - tensioned mesh system to retain both soil scour areas and the toe of a riprap repaired slope (used only in areas where a stable riprap slope design could not be used to avoid encroaching on the stream channel); developed special provisions; and prepared a design report. Mitigation construction was conducted between November 2011 and May 2012.
机译：为了应对2011年8月下旬热带风暴艾琳（Irene）造成的洪水/冲刷破坏，纽约州高速公路管理局和戈尔德（Golder）为奥尔巴尼以南1-87号卡茨基尔克里克大桥下方南部路堤的两个边坡失事地区准备了紧急斜坡缓解设计。 。 2011年8月28日，热带风暴艾琳（Erene）在该地区发生了区域性灾难性洪水。根据美国地质调查局（USGS）的流量监测数据，在从艾琳（Irene）发生洪水期间，卡茨基尔克里克（Catskill Creek）的水位至少上升了25英尺。发生此事件后，Thruway人员检查了桥梁地基，并发现了最近冲刷河床南北各墩周围的路堤填充物，碎石和其他土壤的情况。冲刷包括北向桁架南侧3号墩东脚附近的沙石和土壤流失。冲刷损害了码头基础以及支撑北向结构向东南方向延伸的大部分斜坡。在发现损害后不久，便进行了实地考察，以初步评估码头附近的冲刷损害并收集现场地质/岩土工程现场数据。在一次实地考察期间，发现了较大的滑坡破坏面，以及南部桥梁引道堤顶部的张力裂缝。为了评估潜在的缓解方法，项目团队使用原始的公路/桥梁设计钻孔审查了场地的地质和岩土条件;对破坏模式进行反向分析，以估算岩土条件;开发了概念性的坡度缓解概念，包括Thruway的超大型翻石机设计以减轻冲刷;开发了土壤钉张紧的网格系统，以保留土壤冲刷区域和翻修过的斜坡的脚趾（仅在无法使用稳定的翻修斜坡设计以避免侵蚀河道的区域中使用）;制定了特殊规定;并准备了设计报告。缓解措施的建设于2011年11月至2012年5月之间进行。

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