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1 <br />mmsm <br />RETAINi:%G W/UJL SYSTEAiS <br />; }i. i- M. / i 1. l. i <br />a . ' I » -«»- - _ <br />.• • .«*■•*••«»«*•••• • • . • • « ' ■ ' ’ " ■■■ <br />h \ma APPLICAIIONS <br />2 of <br />'iS®Ht*H2 <br />u <br />If^. <br />• .C' <br />•• -A <br />•? 0. <br />'>-s .i' <br />f—— <br />'•;■.• •“ •;'r <br />L FOH APPLICATIONS WHERE <br />THIS SLOPE IS GREATER <br />THAN 1:1 CONSULTAQUAUFIEO <br />ENGINEER TO DETERMINE THE <br />CORRECT DESIGN SaURON. <br />2 X HI (MINIMUM) <br />MINIMUM SPACING OF TERRACED WALLS TO <br />ALLOW DESIGN AS INDIVIDUAL GRAVITY WALLS. <br />•> > •o' <br />D <br />; I> TYPICAL DESIGN OF CLOSELY SPACED TERRACED <br />WALLS WITH GEOGRID REINFORCEMENT. <br />GEOGRID DESIGN TO MEET REOUIREMENTS <br />FOR UPPER V/Aa NEEDS ONLY.------------- <br />» <br />upper walls. <br />QUESTION: How lar apart do the terrace walls have to be to perform as Individual gravity walls? <br />ANSWER: As a rule of thumb, the minimum distance between <br />the wall terraces must be at least equal to twice the <br />height of the lower wall. <br />E^MPLE: If the lov/er gravity wall is 5 feel (1 .5m) tall, then the <br />minimum recommended spacing between terraces is 10 <br />feet (3m). This rule also applies to walls with more than <br />bvo terraces. The distance between any two terraces <br />must be at least equal to bvice the height of the lower <br />adjacent terrace v/all. <br />Note; This simple ;'jle ol thumb does not address global stability <br />where walls are built on steep slopes Of over poor soils of low fnccon <br />stre.ngth. If these conditions exist, then contact your local Keystone <br />representative or a local engineer. <br />QUESTION: What if there isn’t enough room to space the terraces <br />according to this rule? (2 x HI MIN.) <br />ANSWER: The wall can still be built, but the effect of the upper <br />terrace on the lower terrace and overall stability must be <br />taken into account when designing the wall(s). When <br />the terraces are close together, the design analysis may <br />model the structure as a single taller wall to account for <br />the added load from the upper terrace wall on the lower <br />wall(s). <br />IFSETBAC<<IS<H1 <br />GRID DESIGN LENGTH - HI ♦ H2 <br />f.' . A A* •••*'*'* V» <br />T**‘*. • •• •_ •• • «.**»« *. * *« *,*» *. V <br />rji u Sf • rgrm <br />C t«.- kiysxM Sr*An^«joen VrffMcs • (fta • ill®