Deep Patch Repair, Phase I: Analysis and Design
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2012-03-01
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Edition:Final Report September 2010- March 2012
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Abstract:A repair technique known as a deep patch has been widely used in the western U.S. to address settlement and shallow failures in both fill and natural slopes. While deep patches have been used for over 20 years, there has been little information documented about their performance, design, and construction. The objective of this research was to evaluate the deep patch slope repair methodology by analytical methods and field observations for the purpose of developing a simple design method suitable for use by Federal Lands Highway and Forest Service personnel. Literature was reviewed, current design methodologies were documented and site visits were conducted to better understand how the deep patch methodology has been used in the past, to evaluate the performance of in-service deep patch sites and to help authenticate the newly proposed design method. An analytical study was conducted to model the effects of various slope configurations, failure mechanisms, deep patch design geometries, and type of geosynthetics using 2D and 3D computer modeling software. The effects of depth and vertical spacing of the reinforcement on the performance of the deep patch was analyzed in addition to the geometry of the reinforcement at the face of the slope. From these efforts, a new design procedure was developed.
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