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dot.ca.gov
official
https://dot.ca.gov/-/media/dot-media/programs/engineering/documents/geotechni…
Geosynthetic Reinforced Embankments September 2023 Page 1 of 17 1 Reinforced Embankments Geosynthetic Reinforced Embankment (GRE) is a system that incorporates planar geosynthetic reinforcement within a slope (Figure 1) for slope inclinations less than 70 degrees from horizontal. A GRE is also referred to as a Reinforced Soil Slope. Situations where GRE may be used include: • • • • Limited right of way Shortage of fill quantity for slope construction Excess of excavated materials Distressed or [...] reinforcements. If necessary, one traffic lane may need to be closed during construction. Processed landslide debris may be used as reinforced soil if sufficient geosynthetic reinforcements are used, the reinforced soil materials do not cause creep, and proper subdrain is designed. To keep the slope dry, prefabricated vertical drains may be placed horizontally in conjunction with the geosynthetic reinforcements. 5 Execution and Communication During Design During design, close communication [...] Distressed or deteriorated slopes need to be restored. The components of a geosynthetic reinforced embankment include: geosynthetic reinforcements, reinforced soil, drainage system, and erosion control. The foundation below the GRE (foundation soil) and slope behind the GRE (retained soil) also affect the design of the GRE. Figure 1: Components of Geosynthetic Reinforced Embankment Geosynthetic Reinforced Embankments September 2023 Page 2 of 17 1.1 Common Applications of GRE a. New Construction
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mdpi.com
article
https://www.mdpi.com/2076-3417/9/10/2008
Geosynthetics are modern materials used to improve soil conditions by providing tensile resistance and stability. In the case of soil reinforcement, a primary application of geosynthetics involves reinforcing steep slopes. With the use of geosynthetics, the construction of reinforced steep slopes is often more affordable and technically feasible when compared to traditional construction techniques . Furthermore, geosynthetic reinforcement is a cost-effective solution for stabilizing recurring [...] For soil slope applications, Alabama Department of Transportation (DOT) specifies that the geosynthetic reinforcement (either geogrid or geotextile) shall be constructed of polyester, polypropylene, or polyethylene, resistant to all naturally occurring alkaline and acidic soil conditions, and resistant to heat, ultraviolet light, and to attack by bacteria and fungi in the soil . Reinforcement for soil slopes shall be any geosynthetic whose strength in the machine direction equals or exceeds the [...] ## 5. Construction Practices
The construction of geosynthetic reinforced steep slopes is similar to normal embankment construction, as the reinforcement can be easily incorporated into the backfill material . Information from transportation agencies, manufacturers, and engineers was synthesized by the research team to determine current methods.
#### 5.1. Construction Sequence
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cherokeemfg.com
article
https://cherokeemfg.com/reinforced-soil-slope-walls-rss-walls-installation
A reinforced soil slope is defined as a compacted fill embankment that incorporates geosynthetic reinforcement to increase the soil shear to enhance the stability of the embankment when site conditions require an embankment with a steeper angle of repose (how steep soil can naturally be piled relative to a horizontal plane) or if the embankment is intended to carry a load considered unstable with the existing subgrade. [...] When building a reinforced slope, we will primarily depend on a secondary reinforcement with a light to moderate geosynthetic fabric or grid in tight vertical spacing with relatively short embedment lengths (how far horizontally into the slope these extend). These layers will provide superficial stability to protect the embankment from shallow plane failure at the surface, while also giving compaction equipment a good platform in which to compact soil lifts all the way to the face of the slope. [...] However, when slopes exceed 45 degrees in relativity to a horizontal plane, it’s often best to use wire forms that are either lined with geosynthetic or high performance rolled erosion control product that can retain fine soils while establishing vegetation through the facia treatment. Wire forms do not offer structural strength and should not be considered a structural element. They are placed only to keep the embankment at the desired batter (slope angle) during construction, and to assist
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library.ctr.utexas.edu
research
https://library.ctr.utexas.edu/hostedpdfs/tsusm/0-6792-1.pdf
Contractor: Planum Purpose: Support Structure for Bridge Abutment Geosynthetic Material: Reinforcement: Polyester Geogrid Facing: Polymer Mesh Slope Height: 31 ft Slope Length: 394 ft Slope Angle: 68° Construction Sequence: The reinforced soil slope was formed using geogrid with a wraparound face in 2 ft vertical lifts with a fine green mesh used to retain the soil behind the front face. Permanent lost formwork of angled steel mesh panels were used to form the front face and assist in [...] Slope Height: 10 ft to 30 ft Slope Length: 425 ft Slope Angle: 1H:1V Construction Specifications: Maine Department of Transportation Construction Sequence: The contractor built temporary forms to aid in the construction of the 1H:1V slope and up to 25 layers of geotextile with embedment lengths of up to 25 ft were used with select backfill. The contractor was able to spread the reinforced soil and compact to 95% of standard Proctor effort. The lower zone reinforcing fabric was spaced at 1 [...] Geosynthetic Material: Reinforcement: Polyester Geogrid (3600 lb/ft) Facing: Welded Wire Forms Foundation Soil: Silty-Sand Slope Height: 26 ft Slope Angle: 1H:1V Construction Specifications: South Carolina DOT Construction Sequence: The slope design required primary geogrid reinforcement to be placed at 2 ft vertical spacing for the bottom third of the slope and 6 ft vertical spacing in the upper third of the slope. The geogrid embedment lengths required to satisfy overall slope
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solmax.com
article
https://www.solmax.com/ca/en/blog/what-are-the-key-considerations-in-designin…
Geosynthetic materials, including geotextiles and geogrids, play a versatile role in RSS, enhancing structural support, facilitating drainage, and supporting vegetation growth. These synthetic solutions bridge the gap between soft and hard facing options for reinforced slopes, offering tailored reinforcement that meets specific site requirements. They are particularly valuable in environments subjected to dynamic weather conditions and hydraulic pressures, where traditional materials might fail [...] Reinforced slopes that are 1(H): 1(V) and steeper typically require additional facing support during construction. A geosynthetic face wrap and/or a hard armor facing support system is often employed in these scenarios. Particularly when constructing slopes with materials like silts and poorly graded sands and gravels, or in environments subjected to external erosive forces such as mild water currents and/or wave attack, robust facing supports are essential. Temporary supports such as wooden [...] ### Design principles of reinforced soil slopes
The design of reinforced soil slopes hinges on two critical components: the facing system and the reinforcement strategy. The facing system is integral to erosion protection and structural support, enabling the formation of slopes that surpass natural stable inclinations without compromising stability. Secondary reinforcement, typically comprising geosynthetic materials, aids in compaction and mitigates surficial sloughing at the slope face.
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sciencedirect.com
article
https://www.sciencedirect.com/topics/engineering/geosynthetic-reinforced-soil
There are a number of advantages to constructing a _reinforced soil slope_ (RSS). These come about from a combination of the smaller footprint required, resulting in a reduced right-of-way, and a savings in the total volume of material required to construct a slope or embankment to a particular height. Use of reinforcement may also allow construction of slopes with lower-quality fill material. Where space is available, a RSS can also serve as an economical alternative to MSE walls. It has been [...] While the design of earth-retaining structures is based largely on lateral earth pressure theory, and slope designs are generally based upon slope stability analyses, designs for retaining walls and slopes reinforced with geosynthetic inclusions begin to have much greater similarities. Both applications depend on internal soil-reinforcement interaction (pullout resistance of the reinforcing members), and tensile rupture (tear strength) of the geosynthetic material. Designs must include [...] Finally, the economics of reinforced soils should be addressed. Unless the footing is being placed over reinforced soil for a mechanically stabilized earth wall or other reinforced soil slope, the construction of the reinforcement zone requires excavation of an area to a depth where the attenuated stresses do not exceed the subgrade strength. When adding in the cost of geosynthetics and backfilling with competent material, the cost of simply constructing a larger traditional footing must be
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scdot.org
article
https://www.scdot.org/content/dam/scdot-legacy/business/pdf/geotech/2022-by-c…
Damage during handling and construction, from abrasion and wear, punching and tear or scratching, notching, and cracking may occur in geosynthetics. These types of damage can only be avoided by using care during handling and construction. Construction equipment should not travel directly on geosynthetic materials. Damage during reinforced fill placement and compaction operations is a function of the severity of the loading imposed on the geosynthetic during construction operations and the size [...] and the size and angularity of the reinforced fill. For RSS construction, lightweight, low strength geotextiles and geogrids should be avoided to minimize damage with ensuing loss of strength. Protocols for field testing for this reduction factor are detailed in Elias, et al. (2009) and in ASTM D5818 – Standard Practice for Exposure and Retrieval of Samples to Evaluate Installation Damage of Geosynthetics. These protocols require that the geosynthetic material be subjected to a reinforced fill [...] reinforced slope with a computer program. Layout includes number, length, design strength, and vertical distribution of the geosynthetic reinforcement. The charts presented in Figure D-8 provide a method for generating a preliminary layout. Note that these charts were developed with the specific assumptions noted in this figure. Analyze the reinforced soil slope with the trial geosynthetic reinforcement layouts. The most economical reinforcement layout must provide the maximum stability
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teamues.com
article
https://www.teamues.com/using-reinforced-soil-for-construction-of-retaining-s…
Jul 3, 2025 — Due to high strength, reinforced soil is also utilized to construct earth sloped structures with face inclination of less than 70 degrees. In ...Read more