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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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library.ctr.utexas.edu
research
https://library.ctr.utexas.edu/hostedpdfs/tsusm/0-6792-1.pdf
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 (Holtz, 2003). Furthermore, geosynthetic reinforcement is a cost effective solution for stabilizing recurring slope failures and constructing new permanent embankments (Leshchinsky et al., 1995; Rowe and Jones, 2000). 5 ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! [...] the hillside. The contractor used different facing techniques for the slopes including the use of hessian bags filled with top soil. Once completed, the slope was then hydroseeded using seed indigenous to the area. Cost Effectiveness: As the slope had numerous springs, the drainage system was used to intercept the flow and collect the water, minimizing entry into the reinforced soil slopes and segmental wall. The use of these geosynthetic products enabled the engineers to cost effectively [...] 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
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cherokeemfg.com
article
https://cherokeemfg.com/reinforced-soil-slope-walls-rss-walls-installation
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. [...] 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. [...] Place reinforcement beginning at the face of the slope and moving toward the end of the fabric or grid to ensure geosynthetic is pulled taught being careful to prevent wrinkles, folds, or tears. If wire baskets are used, they will also be placed at the indicated location prior to fill placement, leaving enough geosynthetic to wrap the face and make the next geosynthetic embedment length on the subsequent lift. If geosynthetic is to terminate at the face of the slope, you will line the wire form
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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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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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geosyntheticsmagazine.com
article
https://geosyntheticsmagazine.com/2019/06/01/geogrid-reinforced-soil-structur…
walls and reinforced soil slopes (RSS) (Figure 1). MSE walls and RSS are constructed by placing alternating layers of reinforcement and compacted soil behind a facing element to form a composite material that acts integrally to restrain lateral forces. In ancient times, a variety of materials were used as soil-reinforcing elements, including tree branches and straw. Common types of modern soil-reinforcing elements are steel strips, welded steel grids, wire mesh, geogrids and geotextile sheets. [...] geotextile sheets. The use of a facing system prevents soil raveling between the reinforcing elements and allows very steep slopes and vertical walls to be constructed safely. A wide range of materials are used as facing, including precast concrete panels, dry cast modular blocks, welded wire mesh, wraparound geosynthetics and gabions. The soil material placed within the reinforcement zone is referred to as reinforced fill, and the in situ soil or backfill material placed directly behind the [...] The use of MSE walls and RSS have progressively grown over the last four decades due to advantages they provide compared to alternative soil-retaining structural systems. The cost-effectiveness and simplicity of the construction technique, speed of construction and flexibility of reinforced soil structures are among the benefits that make the technology popular and very attractive. As described above, MSE walls and RSS can be reinforced using metallic and geosynthetic-reinforcement materials.
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sciencedirect.com
article
https://www.sciencedirect.com/topics/engineering/geosynthetic-reinforced-soil
The use of geosynthetics in civil engineering applications is increasing annually. One new application, the construction of a geosynthetic-reinforced soil foundation (GRSF) to support a shallow spread footing has considerable potential as a cost-effective alternative to over-excavation and replacement, consolidation, densification and chemical stabilization. In this technique, one or more layers of a geosynthetic reinforcement and controlled fill are placed below a shallow spread footing to [...] 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 [...] The Federal Highway Administration (FHWA) has recently embraced a newer version of the MSE wall referred to as geosynthetic reinforced soil (GRS) (or geosynthetically confined soil, GCS, by others) (Figure 14.15). These walls employ techniques similar to those for construction of MSE walls, but use much closer vertical spacing (typically 20 cm=8 in.); lighter-weight reinforcement (typically a woven polypropylene geotextile); well-compacted, select granular fill; and smaller facing elements
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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