On the other hand, geotextiles could provide immediate erosion control and slope stability, and natural materials such as jute, straw, and coir, as well as ...Read more
In general terms, economically, at the construction level of slope stabilization, different studies have proven that a construction solution that opts for geocomposites is much more economical and efficient. The use of geosynthetics may reduce or even eliminate waste deposits. Furthermore, geosynthetics can also serve as reinforcing and/or drainage materials to accelerate the consolidation of soft subgrades, thereby reducing execution times, transportation, and gen-eral construction-related [...] Recently, Rimoldi et al. (2021) reported on geosynthetic reinforced soil structures for slope stabilization and landslide rehabilitation in Asia, including slope reinforcement and Fig. 1 Scheme of a geosynthetic reinforced soil slope (from IGS leaflet “Geosynthetics in Slopes over Stable Foundations”) 198 I. P. Damians et al. drainage (Fig. 3). In most applications, geosynthetics usu-ally offer lower production costs than traditional solutions. [...] RSSs have been designed and built even in highly seismic areas (Rimoldi 2018) using cohesive/ marginal fills (Giroud et al. 2014). Layers of geosynthetic reinforcement are used to stabilize slopes against potential deep-seated failure using horizontal layers of primary reinforcement. The reinforced slope may be part of slope reinstatement and/or used to strengthen the sides of earth fill embankments.
Geosynthetic erosion control materials also have important uses for slope and bank protection. The geosynthetic acts to reduce soil erosion caused by rainfall ...8 pages
strengthen a base course in a pavement system. BMP Objectives Perimeter Control Slope Protection Borrow and Stockpiles Drainage Areas Sediment Trapping Stream Protection Temporary Stabilizing Permanent Stabilizing Best Management Practices Manual PC-8 Geosynthetics 08/11 Chapter 5 Post-Construction Erosion control: Geosynthetics can be used to minimize the movement of soil particles due to flow of water. An example of this application is geotextile used between riprap and the stream bank to [...] Separation: Geosynthetics can be used as a separator to separate the two dissimilar materials and prevent them from mixing, such as the use of geotextile between fine-grained subgrade and granular base course below a roadway. Reinforcement: Geogrids or geotextiles can be used as reinforcement to increase shear strength of soils, thereby providing a more competent structural material. Examples of this application include the use of geogrid to reinforce a steep slope, or to strengthen a base [...] applications are normally defined by the primary function of the following: Filtration: Geosynthetics can be used as filters to prevent soils from migrating into the adjacent material, such as drainage aggregate, while allowing water to flow through the system (e.g., the use of geotextile in trench drains, silt fence, etc.). Drainage: Geotextiles or geocomposites can be used as drainage, or conduit, by allowing water to drain from or through low-permeability soils. Separation:
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the slope back at an angle. Subsequently, the face is protected from erosion by vegetation or other protective systems ranging from concrete slabs to geocell walls and including a wide variety of systems. Additional geosynthetic elements are incorporated into reinforced steepened slopes to facilitate drainage, minimize ground water seepage and to assure the stability of the steepened slope and the erosion resistance of the facing. Following are the detailed components of a geosynthetic [...] of a geosynthetic reinforced steepened slope system: • Foundation - Stable soil or bedrock upon which the slope is constructed. Stability in the foundation is assumed. • Retained Soil - The soil which remains in place beyond the limits of the excavation. • Subsurface Drainage - Geosynthetic drainage medium installed at the limits of the reinforced soil zone to control and collect ground water seepage. • Reinforced Soil - The soil which is placed in lifts adjacent to the retained soil and [...] over Soft Foundations, Reinforced Steepened Slopes, Mechanically Stabilized Earth Walls For more information please contact the Geosynthetic Materials Association at www.gmanow.com. An RSS is used to raise this site out of the flood plain. Alternating layers of geosynthetic and compacted soil. The steepened face must be protected from erosion. The finished project includes important structures. A slope repair that must support a roadway. An RSS is constructed using conventional equipment. The
FS Seepage water For typical soil, = 30o 2(H):1(V) slope (27o) 4(H):1(V) slope (14o) Stable Products of Geosynthetics Geosynthetic Products Geotextile (GT) Geogrid (GG) Geonet (GN) Geomembrane (GM) Geosynthetic Clay Liner (GCL) Geocell/geoweb (GW) Geocomposite (GC) Geotube (GTB) Erosion mat (EM) Others Types of Geosynthetics Used Gabr et al. (2006) Type of Polymer Polypropylene (PP) Polyester (PET) Polyethylene (PE) Polyamide (nylon) Others Geotextiles Nonwoven [...] heat-bonded Woven slit-film 300 260 250 260 - - 260 - - 240 240 230 Martin et al. (1984) Mica schist sand (=260) Woven monofilament Ci = Interface strength Soil strength = tan (24o) tan (30o) = 0.8 Geosynthetic Applications Soft Soil Stabilization Erosion Control • Erosion Mat or Blanket • Enhance seed germination and erosion resistance • UV protected Village at Westlake - Austin, TX Stream/River Bank Protection FHWA NHI-07-092 Geocell for Low-water Crossing Clarkin et al. (2006) Geocell for [...] Overview of Geosynthetic Materials, Their Characteristics, Applications, and Design Considerations Jie Han, Professor, Ph.D., PE The University of Kansas Outline of Presentation Introduction Geosynthetic Products Primary Functions Material Characteristics Applications Design Considerations Geosynthetics Geo: Earth - soil or rock Synthetics: Man-made products, mainly polymers Textural Soil Classification Soil Name Particle Size (in.) U.S. Sieve No. Boulders > 12 Cobbles 12 - 3
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