7/25/2019 Design Specifications for Anchored wall as per MOMRA

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 Anchored Walls Section 9: Abutments, Piers and Walls

233

Anchored walls, illustrated in Figure 9.7, may be considered for both temporary and

 permanent support of stable and unstable soil and rock masses.

C  Depending on soil conditions, anchors are usually required for support of both temporary andpermanent non-gravity cantilevered walls higher than about 3000 to 4600 mm.

C  The availability or ability to obtain underground easements and proximity of buried facilities to anchorlocations should also be considered in assessing feasibility.

The feasibility of using an anchored wall at a particular location should be based onthe suitability of subsurface soil and rock conditions within the bonded anchor stressing

zone.

C  Anchored walls in cuts are typically constructed from the top of the wall down to the base of the wall. Anchored walls in fill must include provisions to protect against anchor damage resulting from backfilland subsoil settlement or backfill and compaction activities above the anchors.

Where fill is placed behind a wall, either around or above the unbonded length,

special designs and construction specifications shall be provided to prevent anchor

damage.

Figure 9.7: Anchored Wall Nomenclature and Anchor Embedment Guidelines.

C  The minimum distance between the front of the bond zone and the active zone behind the wall of1500 mm or H /5 is needed to insure that no load from the bonded zone is transferred into the no loadzone due to load transfer through the grout column in the no load zone.

9.9.2. Loading

The provisions of Article 9.6.1.2 shall apply, except that shrinkage and temperature

effects need not be considered.

C  Lateral earth pressures on anchored walls are a function of the rigidity of the wall-anchor system, soilconditions, method and sequence of construction, and level of prestress imposed by the anchors.

C  Apparent earth pressure diagrams that are commonly used can be found in Article 3.10.5.7  and

Sabatini et al. (1999).