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首页> 外文会议>Highway geology symposium;HGS >Rio Blanco Landslide Failure Between Rifle and Meeker Colorado: Investigation, Design and Emergency Mitigation using Lightweight Expanded Polystyrene Fill
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Rio Blanco Landslide Failure Between Rifle and Meeker Colorado: Investigation, Design and Emergency Mitigation using Lightweight Expanded Polystyrene Fill

机译：来福枪和米克科罗拉多之间的里约布兰科滑坡破坏：使用轻质膨胀聚苯乙烯填充物的调查，设计和紧急缓解

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The Rio Blanco landslide is located on State Highway (SH) 13, between the semi-rural towns of Rifle, Colorado and Meeker, Colorado. A roadside embankment composed of fill began to fail in March of 2008, which initiated an emergency response. The failure was approximately 800 feet in length along a section of roadway with a 6 percent climbing grade. The existing embankment fill is comprised of low to moderate plasticity clays and silty clay material that was borrowed from native soils in the project area. Unfortunately, the native clay soils lose cohesive strength when saturated and are prone to surficial slope failures. The embankment fill had been placed into a deeply incised drainage channel creating fill depths greater than 110 feet from the top of the roadway to the underlying claystone bedrock.The geotechnical investigation indicated this section of roadway had two modes of failure: oversteepened embankment slopes and deep seated instability of the filled area. The embankment fill slopes were placed at slope angles ranging from 2:1 to 1:1 (H:V). Periodic failure has been observed on these slopes when the ground is saturated. There was also a deep-seated global failure mechanism that caused settlement, consolidation, and bearing failure of the entire embankment fill section. Inclinometer data indicated a deep-seated, relatively flat-lying failure surface was located between 30and 40 feet below the base of the embankment fill and approximately 30 to 40 feet above the top of the bedrock.During the spring of 2008, the roadway distress became so great that vertical and lateral movement of the landslide required nearly constant maintenance by the Colorado Department of Transportation (CDOT). On occasion, the roadway would experience vertical displacements from 2 to 6 inches a day. This presentation addresses the geotechnical investigation, design, and construction of the emergency repair which subsequently occurred.
机译：Rio Blanco滑坡位于13号州际公路（SH）上，位于科罗拉多州的Rifle和科罗拉多州Meeker的半农村城镇之间。 2008年3月，由填充物组成的路堤开始倒塌，并启动了应急响应。沿一段6％的爬坡坡度，该故障沿路段的长度约为800英尺。现有的路堤填料由从项目区域的天然土壤中借来的中低塑性粘土和粉质粘土材料组成。不幸的是，当饱和时，天然粘土会失去内聚强度，并且容易发生表面失稳。路堤填筑物已被放置在一个切得很深的排水沟中，从道路顶部到下面的粘土岩基岩，填筑物的深度大于110英尺。 岩土工程勘察表明，这部分巷道有两种破坏模式：路堤坡度过高和填土区的深层失稳。将路堤填土坡度放置在2：1到1：1（H：V）范围内的坡度角上。当地面饱和时，在这些斜坡上观察到周期性破坏。还有一个根深蒂固的全球破坏机制，导致整个路堤填筑区的沉降，固结和轴承破坏。测斜仪数据表明，有一个较深的，相对平坦的破坏面位于30 在路堤底部下方40英尺处，在基岩顶部上方约30至40英尺处。 在2008年春季，巷道的困扰变得如此严重，以至于滑坡的垂直和横向运动都需要科罗拉多州交通运输部（CDOT）进行几乎恒定的维护。有时，巷道每天会发生2到6英寸的垂直位移。本演讲介绍了随后发生的岩土工程调查，设计和紧急维修施工。

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