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. <br /> �/ick�ry �ngineerin� � �onsultin��., LLC <br /> i��-:h� �rl.�,���Voo�,';[� n.:.;_ -i;('�:,�ii�•.fti1ti >..,,,�_;�a., <br /> ���onC: .� .=i_o5..�;»� �-�:ax: ,�4.1}nc_;t?� <br /> �vi l:c'i t{ii:�vi:�,;erijer.o_coni <br /> Boulder Wall Calculations - 6-foot Exposed Wal� Height <br /> Project VEC 14-069 - April 2, 2013 <br /> Joseph Feldman Project, Orono, MN <br /> Desiqn Parameters: Page 1 Of 2 <br /> Retained Soil Friction Angle, �sr:= 28deg Soil Unit Weight, �ys:= 125pcf Crest Slope, (�:- Odeg <br /> Foundation Soil Friction Angle, �sf:= 28deg <br /> 8] := 3•�sr bl = 18.667•deb Rock Unit Weight, -yr:= 135pcf Surcharge Load, qs := Opsf <br /> Exposed Height, He := 6ft Wall Embedm ent, Hb := lft Total HeigM, Hr:= He + Hb <br /> Hr = 7ft <br /> Top of Wall Width, Wt := 2ft Base of Wall Width, Wba := 3.Sft <br /> a:= 83deg � := 90deg - a � = 7•deg v := tan(�sf) v = 0.532 <br /> Calculate Wall Weiqht: <br /> W1 :_ .5•(Wba - Wt)•He•�yr•lft W1 = 607.S1bf W2 := Wt•He•�yr•lft W2 = 1.62x 1031bf <br /> W3 := Hb•Wba•-ys-lft W3 = 437.5 lbf Ww= Wl + W2 +W3 Ww= 26651bf <br /> Active Earth Pressue Coefficient (Ka): <br /> 2 <br /> Ka = (cos(�sr +1�)) <br /> 2 Ka = 0.274 <br /> (cos(�))��(cos(bl — �))��1 + «sin(�sr+ S1))�(sin(�sr — (�))] <br /> [(cos(bl - �))�(cos(-� - �i))] <br /> Total Horizontal Force: Wt <br /> Horizontal Force From Soil, Fah:_ .5•7s•Ka•Hr•Hr•cos(SI -�)•lft Fah= 822.31bf <br /> Horizontal Force From Surcharge, Fs:= qs�Ka�Hr�lft Fs= 0 <br /> Total Horizontal Force, Fh:= Fah+ Fs Fh= 8223 lbf <br /> 2 H. <br /> Frictional Resistance: <br /> Vertical Force From Soil, Fav:= .5•�ys•Ka•Hr•Hr•sin(bl - �)�lft Fav= 169.81bf 1 <br /> Fu:= v•(Ww+ Fav) Fu= 1507.31bf <br /> Factor of SafetV, Base Slidinq: <br /> 3 Hb <br /> FOS Sliding, FOSs := Fu FOSs= 1.833 <br /> � Wb <br /> �RjlRCCr/l7f�,�C7�1f/'i(�r7s��7r 7R`,�f151�"�b�C w0�[7"-� <br />