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§ <br />mSKDISE <br />RETAJNir.G WALL SYSTEMSm <br />lyi> <br />ih\ <br />^rf <br />h lERRACE APPIICAIIONS <br />X <br />2 <.f X <br />\o \f <br />HUH2 <br />• FOR APPUCATIONS V/HERE <br />THIS SLOPE IS GREATER <br />THAN 1:1 CONSULT A QUALIFIED <br />ENGINEER TO DETERMINE THE <br />CORRECT DESIGN SOLUTION. <br />2 X HI (MINIMUM) <br />MINIMUM SPACING OF TERRACED WALLS TO <br />ALLOW DESIGN AS INDIVIDUAL GRAVITY WALLS. <br />II <br />I ii Im. <br />• r <br />■j <br />: • } <br />- <br />An area of design that affects many site appiications is the use of terraced walls. The upper terrace wail can put pres ­ <br />sure on the lower terrace If the walls are too close together. Multiple terrace walls In close proximity to each other, can <br />have structural stability Issues related to the lower walls not having the capacity to carry the loads developed by the <br />upper walls. <br />QUESTION: How far apart do the terrace walls have to be to perform as individual gravity walls? <br />i <br />ANSWER: As a rule of thumb, the minimum distance between <br />the wall terraces must be at least equal to twice the <br />he-ght of the lower wall. <br />EXAMPLE; If the lower gravity wall Is 5 feet (1 .5m) tall, then the <br />minimum recommended spacing betv/een terraces is 10 <br />feet (3m). This rule also applies to walls with more than <br />two terraces. The distance between any two terraces <br />must be at least equal to twice the height of the lower <br />adjacent terrace wall. <br />Note: This simple rJe of thumb does not address global stability <br />where walls are built on steep slopes or over poor soils of low fnclion <br />strength. 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 a'le? (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 si gle taller wall to account for <br />the added load from the upper terrace wall on the lower <br />wall(s). <br />• r> TYPICAL DESIGN OF CLOSELY SPACED TERRACED : <br />WALLS WITH GEOGRID REINFORCEMENT. <br />GEOGRIO DESIGN TO MEET REOUIREMENTS <br />FOR UPPER WALL NEEDS ONLY. <br />IF SETBACK IS<H1 <br />GRID DESIGN LENGTH . HI ♦ H2I ^ •*•••••• I <br />GEOGRIO DESIGN TO CARRY LOADS A <br />■ FROM UPPER 4 LOWER WAaCONDITIONS. .A <br />• r. <br />im aes.mt