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�� <br /> 1�1 SQ� ��5 <br /> c+eoc,rds <br /> Geogrids are flexible, synlhetic meshes which are <br /> manufacWred specifically tor slope stabilization and earth � <br /> relention. ihese "grids"are availabie in a variety of materials, ~'� <br /> sizes and sirengths. They can be made of high rensile strength � <br /> plastics or woven polyester yarns and are typicaily packaged <br /> al lhe facinry in rolls. The grids are rated by Longderm <br /> A�lowable Design <br /> Strength (LTADS) wilh <br /> values ranging from _ _ <br /> 500 to 3,000 pounds . _ <br /> per linear foot <br /> (7.3N/m l0 43.8N/m). � The Great Wall of China, dating back some 2,200 years, was built es <br /> � a double sidetl rMaining wall. The wil between llie two walls was a <br /> See relerence 3, 4 mixNre o!day and gravel reln/orced witA Tamarisk branches. Allan <br /> � Block retaining walls employ "old technology with new malerials." <br /> When wall heights exceed those listetl in the graviry wall chart, geogrid can be added to provide a stable wall condilion. Layers <br /> of geogrid inserted bi tween the blocks and exlending behind lhe wall irnerlock with the surrounding soil to create a cohesive <br /> soil mass. This mass uses its own weight and internal shear strenglh to resist bolh the sliding and the overturning pressures Irom <br /> Ihe soil being retained. The granular material in the Allan Block cores provide a posilive connedion between Ihe layers of <br /> geogrid ancl lhe Allan Block wall, locking the two systems logether. The reinforced soil mass becomes the struclure and the Allan <br /> 81ock wall beromes the tacing. The specific location and embedmenl IenglL•of lhe grid layers depends upon the sile conditions, <br /> wall heighls and Longderm Allowable Design Slrenglh of Ihe grid being used. <br /> R�b\I@ �1'�1OdC <br /> Ailan Biock's gravel (illed hollow core provides a multi�point <br /> �`� r irnerlock wilh the grid. As wali heights incryase, our excWsive <br /> �. .� "rock lock" conneclion, combined with the weight ol the <br /> . � Allan Block units, provides the besl <br /> � .,�r ',. block�to�grid inlerlock of any system <br /> ,� / ,; on ihe markel. See relerence 3 <br /> / <br /> � � � <br /> AB Geogrid Wall Typieal Seetion <br /> �Q'f Q�'7�C�'�a'i <br /> • Grid slren:�ih Selecl lhc right strenglh grid lor ihe�ob. "°"""�� °°"°' <br /> Choose trom 500 Ib/R to 3000 lu/� (7.3 N/m ro 43.8 N/m), �� <br /> • Embedment lenglh Gnd length musl extend far enough �''��-"" '' ^ <br /> 7ehind Ihe wall to cmale a su(ficient gravity mass. ��—�•�w�� �_ �,,,,,„, <br /> • Number of IayeR Install enough layers to adequately <br /> increase Uie internal strength of lhe soil mass and handle Uie ���' ��� <br /> total load. .......K. <br /> ...,.e. <br /> • Spacing 6etween layen Grid layers musl be correcUy '°' �' <br /> spaced lo overcome local loads. �.� ��..�.y.. .. <br /> .e,....,......,ww." <br /> • Connection strength Block and geogrid must work .:��z�� � � � �'���1 <br /> �ogether Io overcome forces Irom the relained mass. � <br /> 9 <br />