MECHANICALLY STABILIZED EARTH (MSE) WALL SYSTEMS

Transcription

1 DRAINAGE SOLUTIONS SINCE 1908 MECHANICALLY STABILIZED EARTH (MSE) WALL SYSTEMS PERMANENT AND TEMPORARY ENGINEERED WALL SOLUTIONS ECONOMICAL DURABLE VERSATILE ARMTEC.COM

2 MSE RETAINING WALLS Armtec Mechanically Stabilized Earth (MSE) walls and Reinforced Soil Slopes provide a cost-effective earth retention solution for both permanent and temporary applications. Mechanically stabilized earth technology allows the construction of slopes that are steeper than those naturally permitted by the native soil s internal friction angle. Steeper slopes permit more efficient land usage reducing overall development costs. Armtec systems utilize geosynthetics such as uniaxial geogrids or high strength woven geotextiles to reinforce the soil and create a stable gravity mass to resist potential lateral loading. When slopes become steeper than 70 degrees above the horizontal, they require fascia materials to provide increased stability at the face of the system. A variety of facing options are available such as welded wire mesh, Bin-Wall, geocell and decorative concrete blocks. TYPICAL APPLICATIONS Land development Highway and road structures Preload embankments Forestry, mining, and oil and gas applications Landscape projects Golf courses Residential properties With Armtec s MSE WALL SYSTEMS, your project is on solid ground. STRONG AND DURABLE FUNCTIONAL ECONOMICAL VERSATILE Increased soil stability Proven long-term performance Exceptional erosion protection Allows construction of vertical or near-vertical MSE walls Flexible system tolerates more movement than rigid walls Low upfront cost Efficient land usage Potential for on-site soil to be used as backfill Suitable for both permanent and temporary applications Wide range of fascia options available WHISTLER SKI TRAIL GEOGRID WRAP-BACK DESIGN USED TO ACOMMODATE LOCATION S SEISMIC ACTIVITY VEGETATED WALLS PROVIDE AN AESTHETICALLY PLEASING, NATURAL APPEARANCE 2 VISIT ARMTEC.COM FOR MORE INFORMATION

3 MSE WALL DESIGN TYPICAL MSE WALL COMPONENTS MSE Walls are comprised of three components: soil reinforcement, backfill material and a facing unit. 1. Soil Reinforcement Uniaxial geogrids or high strength woven geotextiles provide soil reinforcement. 2. Backfill Material A free draining, granular material is typically recommended for soil reinforcement backfill. The gradation of backfill material follows AASHTO LRFD construction specifications. SIEVE SIZE PERCENT PASSING (%) 100mm (4.0in) mm (No. 40) μm (No. 200) 0 15 Minimum backfill compaction is typically 95% Standard Proctor Maximum Dry Density (SPMDD) 3. Facing Unit Typical facing units include welded wire mesh, geocell, Bin-Wall, decorative concrete blocks or vegetated face. FIGURE 2: Typical MSE Retaining Wall NOTE: REINFORCED SOIL ZONE The following industry accepted standards of practice are used in design: NATIONAL CONCRETE MASONRY ASSOCIATION (NCMA) FEDERAL HIGHWAY ADMINISTRATION (FHWA) 3 GEOCELL FASCIA 1 SOIL REINFORCEMENT NATIVE SOIL 2 COMPACTED BACKFILL MATERIAL PERFORATED DRAIN PIPE FOUNDATION SOIL ARMTEC DRAINAGE SOLUTIONS 3

4 PERMANENT WELDED WIRE MESH WALLS ROCK FACED WELDED WIRE MESH WALL The combination of a welded wire mesh facing, biaxial grid wrap and uniaxial geogrid soil reinforcement produces a rock aggregate facing that is both cost-effective and reliable. Rock aggregate faced systems are best suited for structures with geometries that are too steep to support vegetation. FLEXIBLE FASCIA IS IDEAL FOR AREAS WHERE SETTLEMENT MAY OCCUR DUE TO COMPRESSIBLE FOUNDATION SOILS VEGETATED WELDED WIRE MESH WALLS Vegetated welded wire mesh walls are both environmentally friendly and can provide an aesthetically pleasing structure. Welded wire mesh facing is combined with a biaxial green grid wrap and uniaxial geogrid for soil reinforcement. The facing system provides an environment for long-term vegetation growth on an erosion controlled face. During construction, seeded topsoil or hydro-seed material is placed behind the biaxial green grid at the face of the wall to initiate vegetation growth. MSE VEGETATED WALLS PROVIDE A DURABLE FACING AND SURFACE EROSION PROTECTION 4 VISIT ARMTEC.COM FOR MORE INFORMATION

5 FIGURE 2: Wire mesh unit detail NOTE: Other sizes of wire mesh baskets are also available. Contact an Armtec representative for further information. 3000mm 4 GAUGE WIRE WITH WIRE STIFFENER AT 50mm SPACING (TYP) 500mm WIRE STRUT STIFFENERS 100mm 100mm 400mm FIGURE 3: Typical section of welded wire mesh wall facing unit COMPACTED SOIL FILL WELDED WIRE MESH TOPSOIL AND SEED EROSION CONTROL BLANKET OR BIAXIAL GEOGRID PRIMARY SOIL REINFORCEMENT (UNIAXIAL GEOGRID) NATIVE SOIL OPTIONAL SPRIGS PERFORATED DRAIN PIPE FOUNDATION SOIL MSE RETAINING WALLS ARE VERSATILE AND CAN BE CUSTOM ENGINEERED TO SUIT YOUR SITE CONDITIONS! ARMTEC DRAINAGE SOLUTIONS 5

6 PERMANENT WALLS GEOCELL Armtec s cellular confinement systems can be used in conjunction with granular or weaker soils to create an engineered-grade composite. Typical applications include earth retention, channel lining, slope protection and load support. Geocells also provide an economical option for structural end treatments. Confinement of a weaker soil within the individual cells of the geocell mat allows these soils to exhibit characteristics of stronger soils. When utilized in conjunction with uniaxial geogrids, geocells provide an effective facing option. Geocell MSE walls can be conventionally seeded or hydro-seeded after construction to create vegetative walls. GEOCELLS CAN GREATLY REDUCE THE NEED FOR EXPENSIVE GRANULAR MATERIALS BIN-WALL MSE WALLS Armtec s Bin-Wall retaining wall system is a four-sided bin-type earth retention system. As a MSE wall, Bin-Wall uses standard front-face Bin-Wall components in conjunction with uniaxial geogrid to create a stable gravity mass. The geogrid soil reinforcements allow Armtec s Bin-Wall to be easily altered to accommodate obstructions and improve stabilty. This system provides an ideal solution for site locations with limited or constrained access, such as in the construction of long walls in narrow corridors. A BIN-WALL MSE WALL WITH GEOGRID SOIL REINFORCEMENT PROVIDES A COST EFFECTIVE SOLUTION WHERE ACCESS IS LIMITED AND OBSTRUCTIONS ARE PRESENT 6 VISIT ARMTEC.COM FOR MORE INFORMATION

7 TEMPORARY WALLS Temporary walls can be constructed utilizing high strength non-woven geotextiles and temporary forms to create geotextile wrapped faced walls which are a cost effective and reliable temporary wall solution. Temporary walls reinforced with geosynthetics are a valuable tool for construction sites that need to divert traffic, water flow or apply a surcharge to consolidate foundation soils while maintaining the existing surroundings. TEMPORARY WALLS OFFER AN ECONOMICAL SOLUTION WITH THE STRENGTH TO ACCOMMODATE SIGNIFICANT LOADING When temporary forms cannot be used due to site constraints, welded wire mesh facing in combination with geotextiles is an excellent alternative. HEADWALLS Headwalls are used in culvert and structural plate installations to provide slope retention, improved hydraulics and protection against erosion, scour, piping and uplift. Armtec s wire mesh and geocell MSE walls provide an effective and economical headwall solution. They are easy to install and native material can often be used for backfill, saving both time and money. MSE HEADWALLS PROVIDE AN ATTRACTIVE FINISH TO STRUCTURAL PLATE STRUCTURES ARMTEC DRAINAGE SOLUTIONS 7

8 Find out how MSE Wall Systems can be used on your next project. Contact us today. Armtec is a leading Canadian infrastructure and construction materials company combining creative engineered solutions, relevant advice, dedicated people, proven products and a national presence with a local focus on exceptional customer service ARMTEC ARMTEC.COM Drawings and product details are for information and/or illustrative purposes only, and may vary. Please contact your local Armtec representative for the most current product information. MECHANICALLY STABILIZED EARTH (MSE) SYSTEMS / PRODUCT GUIDE PROD-C08-G05-PG-E