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� <br /> C#"a�ity �'tE�lls� <br /> A retaining wall that relies sole!y on it's own weight to stand up is callr.d a gravity wall. <br /> Allan Block combines the basic engineering principles of setback, leverage and total unit <br /> mass with simple mechanics to make highly stable gravity walls. <br /> Selbadc & Slitin9 Vl�dc�e :-, _-= '.-� __�':_ <br /> ...1 Ca+�.:s 5C. <br /> Every relalning wall supports a "wedge" ol soiL The wedge is �';j� � � `_='�� <br /> .\ .:.C%:1E �E5'C-L.d�LL C:^Cc•� �.:., <br /> defined as�he soil which extends beyond the failure plane of lhe �, �! j' _ <br /> soil lype present at the wall site, and can be calculated once Ihe �i if� if � V;, ,_ I . <br /> soil friction angle is known. As Ihe setback ol the wall increases, � �; ltl � ' <br /> 1.� .�—P.:iLu�E <br /> the size of the sliAing wedge is reduced. This reduclion lowers _-�.__ <br /> the pressure on the ie�aining wall. Sce rclerences 4, 10, 20 � ' ' � � � <br /> Leuera�cJe at! 7i�Ra1 li'�t N�ss <br /> •� A5 the setback of a graviry wall increases, lhe leverage from row lo row increases. <br /> This added leverage allows you to build laller walls be(ore reinforcement is needed. <br /> Wilh the hollow core design, Allan Bbck comes to the job site weighing less than solid, <br /> heavy block. Once Ihe cores are lilled, Ihe Allan Blocks develop Ihe same unit mass as <br /> solid blocks. This mass combines wilh thc <br /> selback lo delermine lhe maximum <br /> �1:�•. sw gravity wall heights. � �J' <br /> Sec iable 8.1. Sce rcicrence 4 A'� <br /> • �— <br /> , Allan Block's 12°System ean '�'� <br /> � � achieve wall heights up fo 5.5 R. <br /> '�, � . without rein(orcement. <br /> C#-a�ity V1�11 EM�lysis <br /> Before you analyze any relaining wall make sure you have an accurate plcture of the job site condltlons. Every retalning <br /> wall must be englneered to withsland lhe pressure from the solls and olher loads behind and above them. $tandard gravlty <br /> wall analysis considers sliding, bearing and overWrning forces. On sites with slopes and surcharges a global stablllly check <br /> will also be neressary. <br /> s�iang �-- �ir�C��ecitY <br /> - � Ability of Ihe strucwre to . � Abllity of the underlying soll <br /> � . �� overcome the horizontal to support the wefght o( the <br /> force applied to lhe walL � :I sWCYure. <br /> � Factor of sa/ety = 1.5 iador of safety = 2.0 <br /> �--., —�'\ <br /> � <br /> ♦ �+*'�� /� Glal��1 Sfalality <br /> � Ability of the sWcture to �-• � � Abilily of the Intem2� <br /> �� overcome the overtuming strength of lhe soil to <br /> . � momenl crealed by the ��� � support the complele sofl <br /> � � . rotational forces applied lo ��;.� . mass. CotriaGt local desfgn <br /> . the wall. • �hr speclallst fa help In <br /> Faemr of sa/ety = 2.0 . evaluating your site. <br /> OTHER CONSIOERATIONS: • Slopas • Surcharges • Urraess See rererence 4 <br /> 7 <br />