#Concrete block core fill calculator manual#
#Concrete block core fill calculator professional#

Increasing the length of the geosynthetic layers increases the SRW’s resistance to overturning, base sliding, bearing failure and geosynthetic pullout. Geosynthetic length ( L) is typically controlled by external stability or internal pullout capacity calculations. Soil-reinforced SRWs may also be referred to as mechanically stabilized earth (MSE) walls, the generic term used to describe all forms of reinforced soil structures.ĭESIGN CONSIDERATIONS Geosynthetic Length and Spacingįor soil-reinforced segmental retaining walls, geosynthetic reinforcement increases the mass of the composite SRW structure, and therefore increases its resistance to destabilizing forces. This mechanically stabilized wall system, comprised of the SRW units and a reinforced soil mass, is designed to offer the required resistance to external forces associated with taller walls, surcharged structures, or more difficult soil conditions. The geosynthetic reinforcement is placed between the units and extended into the soil to create a composite gravity mass structure. Figure 2 illustrates a typical soil-reinforced segmen- tal retaining wall and current design terminology.

They may be geogrids or geotextiles, although current SRW construction typically uses geogrids. Geosynthetic reinforcement materials are high-tensile-strength polymeric materials. The reinforcement increases the effective width and weight of the gravity system. The soil is stabilized by horizontal layers of reinforcement, typically a geosynthetic material.

Soil-reinforced SRWs are composite systems consisting of SRW units in combination with a mass of reinforced soil. Soil-Reinforced Segmental Retaining Walls

#Concrete block core fill calculator professional#

Where such specific requirements do not exist, NCMA recommends an engineered design performed by a registered professional on walls with a total (design) height, H, exceeding 4 ft (1.21 m) (for further detail, refer to TEK 18-11A, Inspection Guide for Segmental Retaining Walls (ref. It is recommended that users of this TEK consult local building codes to determine additional SRW requirements and the engineering needs of their project.

#Concrete block core fill calculator manual#

This TEK provides a general overview of design considerations and the influences that height, soil, loads and geometry have on structural stability, based on Design Manual for Segmental Retaining Walls (ref. Segmental retaining walls are used in many applications, including landscaping walls, structural walls for changes in grade, bridge abutments, stream channelization, waterfront structures, tunnel access walls, wing walls and parking area support. The typical size of SRW units, placed without mortar (dry- stacked), permits the construction of walls in locations with difficult access and allows the construction of tight curves or other complex architectural layouts. SRWs are durable and long lasting retaining wall systems.

Stability is provided by a coherent mass with sufficient width to prevent both sliding at the base and overturning about the toe of the structure under the action of lateral earth forces. The self-weight of the SRW system is either the weight of the SRW units themselves including aggregate core fill if used (in the case of conventional SRWs) or the combined weight of the units, aggregate core fill if used and the reinforced soil mass (in the case of soil-reinforced SRWs). Segmental retaining walls (SRWs) function as gravity structures by relying on self-weight to resist the destabilizing forces due to retained soil (backfill) and surcharge loads.