Slope Stability

Slope Stabilization and Corridor Repair for State Highway

Minnesota, USA

In June 2012, more than 10 inches of rain fell in two days on parts of northeastern Minnesota, saturating the ground and causing massive slope failures along Minnesota Highway 210 through Jay Cooke State Park. These landslides compromised the public’s safe use of the highway, washing out some sections of the road completely. Shortly after the event, emergency repairs were completed to portions of the road allowing access to a regional utility’s hydropower facilities.

Using a design-build contracting framework, the Minnesota Department of Transportation (MnDOT) competitively selected the team of Veit & Company, Inc., Barr Engineering Co., and SRF Consulting Group, Inc. to repair and stabilize 74 landslide sites totaling more than 28 acres of steep slopes along approximately 3.5 miles of the highway. Barr conducted geotechnical investigations consisting of more than 120 soil borings to characterize soil, rock, groundwater conditions, and in-situ soil strength. Barr designed permanent repairs to stabilize the failed and unstable slopes and some interim repairs, to reduce the risk of future landslides, and minimize long-term maintenance while maintaining the natural character of the surrounding St. Louis River valley and Jay Cooke State Park.

The sensemetrics Cloud was selected as the instrumentation management system and is being used to verify the performance of the repaired highway and slopes. Barr designed and automated a project-wide sensemetrics instrumentation network of over 2,400 monitoring points and devices. sensemetrics has the worlds largest range of manufactured sensors pre-integrated to the platform, allowing sensor selection to be tailored to each repair solution. Instrumentation consists of manually and remotely-operated Leica automated motorized total stations, Measurand ShapeArrays, Geokon vibrating wire piezometers and vibrating wire tilt sensors, a notched weir in a manhole to monitor seepage flow, a Vaisala weather stations. Barr chose sensemetrics’ THREAD devices for their modern IoT capabilities, plug-and-play approach, mesh networking capabilities and capacity to integrate with a variety of sensors to present near real-time data to the project stakeholders.

 

 

 

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