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Pioneer Mountains Scenic Byway frost heave prevention and results

April 1, 2016

Abstract The Pioneer Mountains Scenic Byway, located about 30 miles (48km) west of Dillon, Mont., seasonally experiences frost heave problems over a 20-mile (30-km) stretch of road. The road is closed to winter traffic and typically re-opens in May. Longitudinal full-section depth cracks form during the spring thaw. One location, in the high alpine meadows …

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Bridge building in Maine with GRS (geosynthetic-reinforced soil)

The challenge In 2013, the small town of North Haven on North Haven Island off the coast of Maine, began construction on a unique bridge project. The goal was to rebuild Beach Bridge, a deteriorating structure that provided access to a handful of seasonal homes and an important wharf for local lobstering as well as …

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Part 1 Durability of geosynthetics: The basics

August 1, 2015

By John H. Greenwood Author’s note This article is based on a training presentation delivered on Sept. 24, 2014, at the 10th International Conference on Geosynthetics in Berlin, Germany. That talk was itself based on courses given at ERA Technology, Leatherhead, U.K., with Alan Friday, and later at SKZ in Würzburg, Germany, with the participation …

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Instrumented MSE wall reinforced with polyester straps

Emerging technology Introduction Mechanically stabilized earth (MSE) walls with large concrete panel facing, reinforced with polyester straps, is an emerging technology in the U.S. To enable the design of this wall system using AASHTO’s methodology, its classification of extensibility must be established. This empirical classification results in adequate internal stability. Internal design of MSE walls …

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Geosynthetic reinforcement solutions for Lake Tahoe highway

February 1, 2014

By Katie Westfall Introduction U.S. Highway 50 crosses the central portion of Nevada through several large desert valleys, basins, and mountain passes. The road climbs steep 8% grades and carries travelers around hairpin turns and through pine forests. In some places, erosion of the slopes adjacent to the highway is a problem for motorists who …

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California dam expansion using geosynthetic-strip reinforced MSE wall

August 1, 2013

By Fransiscus S. Hardianto, Robert Lozano, John E. Sankey, and David K. Hughes Introduction The Los Vaqueros Dam was originally built in 1997, creating the Los Vaqueros Reservoir, to improve the quality and reliability of water available to the Contra Costa Water District (CCWD) in Northern California. In 2011, the CCWD expanded the reservoir from …

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Geofoam solution for underground coal mine tunnel

By Terry Meier About 30 miles east of Salina, Utah, nestled in the western bituminous region of Sevier County, is Convulsion Canyon (Photo 1). This is home for a productive Southern Utah Fuel Co. (SUFCO) underground coal mine, where a longwall mining system and continuous miner units extract more than 6 million tons of coal …

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Dominican Republic farm road improved with new retaining walls

June 1, 2013

Geogrid reinforcement improves access. By Ángel Conde Introduction The 25-km dirt road from Jarabacoa to Constanza in the mountainous central region of the Dominican Republic has long been a lifeline for local farmers transporting their bananas, vegetables, strawberries, coffee, and flowers. But the road suffered from landslides, severe erosion, and uneven surfaces, which slowed the …

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Performance, design, and redundancy

Geosynthetic reinforced walls in the public sector By Dov Leshchinsky and Fumio Tatsuoka Introduction Geosynthetic reinforced soil can be viewed as a subset area of slope stability. In slope stability analysis, the factor of safety signifies the margin of safety against failure. It physically means that its reciprocal value signifies the average mobilization or utilization …

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Geosynthetic solutions for Northumberlandia

February 1, 2013

The largest human form sculpted into the landscape By Patricia Guerra Escobar 1. Introduction 1.1 Project concept Northumberlandia is the world’s largest human form sculpted into the landscape, designed by renowned landscape architect and artist, Charles Jencks. The woman earth sculpture is lying at the entrance of a surface coal mine in southeast Northumberland, near …