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�/ickery �n�inecrin� £� Consultin�Q'.,LLC <br /> I'i-}9 I yi��.ir�e 4�v��oc��t,�rive.�_c�en e�,3irir.M�; �^54,'-1 iUJ <br /> ��onr_, •�ti2-�4�c'�_SL,-L � .�� '_-4Lc-I.�'I <br /> ivic�rr��i.avic��rn�eri�.cc�n•� <br /> Boulder Wall Calculations - 4.5-Foot Total Wall Height(South Wall) <br /> Project VEC 14-003A- August 5, 2014 <br /> 1161 Elmwood Avenue, Orono, MN <br /> Page 1 of 2 <br /> Desiqn Parameters: <br /> Retained Soil Friction Angle, �sr:= 28deg Soil U nit Weight, -ys:= 130pcf Crest Slope, �3:= 18.4deg <br /> Foundation Soil Friction Angle, �sf:= 28deg <br /> 2 <br /> S1 :_ -•�sr S1 = 18.667•deg Rock Unit Weight, �yr:= 135pcf Surcharge Load, qs := Opsf <br /> � <br /> Exposed Height, He:= 4ft Wall Embedm ent, Hb:= lft Total Height, Hr:= He+ Hb <br /> Hr= �tt <br /> Top of Wall Width, Wt:= 1.Sft Base of Wall Width, wba := 3ft <br /> a:= 83deg �:= 90deg- a � = 7�deg v := tan(�sf) v = 0.532 <br /> Calculate Wall Weiaht: <br /> W1 :_ .5�(Wba - Wt)�He•�yrlft W1 = 4051bf W2 := Wt�He��yr�lft W2 = 8101bf <br /> W3 := Hb•Wba•^ys•1 ft W3 = 3901bf Ww:= W 1 + W2 + W3 Ww= 1605 lbf <br /> Active Earth Pressue Coefficient(Ka1: <br /> Ka= (cos(�sr+ �)) <br /> 2 <br /> 2 Ka= 0.37 <br /> (cos(�))�•(cos(S1 - �))•�1 + «sin(�sr+ S1))�(sin(�sr- �))] <br /> [(cos(S1 - �))•(cos(-�t�- (3))] <br /> Total Horizontal Force: Wt <br /> Horizontal ForCe From Soil, Fah:= .5•�ys•Ka�Hr�Hrcos(81 - �)•lft Fah= 589.S1bf <br /> Horizontal Force From Surcharge, Fs:= qs�Ka•Hr•1 ft Fs= 0 <br /> Total Horizontal Force, Fh:= Fah+ Fs Fh= 589.5 lbf <br /> 2 H. <br /> Frictional Resistance: <br /> VertiCal ForCe From Soil, Fav:= .5•�ys•Ka•Hr•Hrsin(Sl - �)�lft Fav= 121.71bf 1 <br /> Fu:= v•(Ww+ Fav) Fu= 918.1 Ibf <br /> Factor of Safetv. Base Slidinq: <br /> 3 Hb <br /> FOS Sliding, FOSs:= Fu FOSs= 1.558 <br /> Fh wb <br /> ��n�ineerrn�so�utions fo�an Unsta�i�e (/Vo�o� <br />