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library.ctr.utexas.edu
research
https://library.ctr.utexas.edu/hostedpdfs/tsusm/0-6792-1.pdf
regarding design methods is provided in Chapter II. CONSTRUCTION PRACTICES The case study information was synthesized from projects of private and public ownership. Therefore, requirements for construction practices vary from transportation agency specifications to supplier recommendations. The following sequence was followed for typical construction of a reinforced slope: 1. Site preparation. 2. Place the first reinforcing layer. 3. Place backfill on reinforcement. 4. Compaction control. 5. [...] in steep slope construction. Therefore, a synthesis study of geosynthetic reinforced steep slopes has been conducted to enhance the present understanding of this technology. The study summarized the benefits and limitations of utilizing geosynthetic reinforcement and investigated current design and construction methods in order to determine best practices. Additionally, the cost effectiveness of geosynthetic reinforced steep slopes was examined. Case studies were also identified and assessed to [...] and assessed to determine optimal soil conditions, geometry of the slope, design criteria, construction specifications, and performance measures. The synthesis study summarized best practices, existing methodologies, and recommendations for the use of geosynthetic reinforced steep slopes in Texas. 17. Key Words Geosynthetic, Geogrid, Geotextile, Reinforced Soil, Slope, Embankment 18. Distribution Statement No restrictions. This document is available to the public through NTIS: National
M
mdpi.com
article
https://www.mdpi.com/2076-3417/9/10/2008
## 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 [...] reinforcement technology, a synthesis study was conducted on geosynthetic reinforced steep slope. This study is very important because in not only highlighting the advantages and limitations of using geosynthetic reinforcement but also in investigating the current construction and design methods with a view to determining which best practices can be employed. Furthermore, this study also identified and assessed the optimal condition of the soil, performance measures, construction [...] 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
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scdot.org
article
https://www.scdot.org/content/dam/scdot-legacy/business/pdf/geotech/2022-by-c…
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 [...] 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 [...] core • Long-term inflow/outflow capacity Procedures for checking geotextile permeability and filtration/clogging criteria are presented in Geosynthetic Design and Construction Guidelines, Holtz, Christopher and Berg (2008), FHWA NHI-07-092. Long-term compressive stress and eccentric loadings on the core of a geocomposite should be considered during design and selection. Though not yet addressed in standardized test methods or standards of practice, the following criteria are suggested for
C
cherokeemfg.com
article
https://cherokeemfg.com/reinforced-soil-slope-walls-rss-walls-installation
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 [...] 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 [...] A minimum of 6 inches of soil is required prior to the operation of vehicles on the geosynthetic. Avoid sudden stopping or braking, and do not turn tracked equipment on the fill area to avoid displacement. Light rubber tire vehicle operation can sometimes be acceptable if it is infrequent and slow, and turning is minimized.
Ensure fill is compacted as indicated in construction drawings before placing the next layer of reinforcement, wire forms, and fill.
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solmax.com
article
https://www.solmax.com/ca/en/blog/what-are-the-key-considerations-in-designin…
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 [...] 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 [...] When employing geosynthetic materials, ensuring UV stability is crucial for long-term effectiveness, especially in environments with significant exposure to sunlight. Structures with a design life greater than three years, as recommended by FHWA guidelines, should use UV-stable materials to prevent degradation over time. In vegetated structures, where vegetation might provide some protection from UV light, the use of UV-stable facing is still recommended to safeguard against areas where
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dot.ca.gov
official
https://dot.ca.gov/-/media/dot-media/programs/engineering/documents/geotechni…
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 [...] 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 [...] control during construction Potential issues of access for maintenance crews on the steepened slope Guardrails are often necessary for highway above the steep slopes built with GRE Geosynthetic Reinforced Embankments September 2023 Page 3 of 17 2 Geotechnical Design Practice The geotechnical tasks for the design of GRE include: • • • • • • • Work with Project Development Team (PDT) members on evaluating whether the GRE is a preferred option Review available project, design, and geotechnical
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library.geosyntheticssociety.org
article
https://library.geosyntheticssociety.org/wp-content/uploads/resources/proceed…
Design of geosynthetic reinforced soil slopes for permanent applications require use of long-term interaction coefficients. Direct shear coefficients are
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fhwa.dot.gov
official
https://www.fhwa.dot.gov/publications/research/infrastructure/structures/brid…
(L) 1 CHAPTER 1. TECHNOLOGY OVERVIEW 1.1 INTRODUCTION Geosynthetic reinforced soil (GRS) consists of alternating layers of compacted fill and closely spaced (≤ 12 inches) geosynthetic reinforcement. The technology has many applications, with bridge support being the focus of this design and construction manual, which serves as a complete guide that supersedes the 2011 Geosynthetic Reinforced Soil Integrated Bridge System Interim Implementation Guide.(1) Updates are largely based on [...] implemented field inspection program provides an opportunity to take corrective action during the construction process. A critical component of construction is compaction behind the facing element followed by placement of the geosynthetic reinforcement. Those responsible for performing these construction activities are best suited for maintaining the quality of each GRS wall layer. Note that in the RSF and the integrated approach, a geotextile must be used to prevent migration of fill material [...] Design and Construction Guidelines for Geosynthetic Reinforced Soil Abutments and Integrated Bridge Systems PUBLICATION NO. FHWA-HRT-17-080 JUNE 2018 Research, Development, and Technology Turner-Fairbank Highway Research Center 6300 Georgetown Pike McLean, VA 22101-2296 FOREWORD This manual provides information on the design and construction of Geosynthetic Reinforced Soil (GRS) abutments and the Geosynthetic Reinforced Soil-Integrated Bridge System (GRS-IBS). It serves as a follow-up to the