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VicLery E_ngineering& Consulting,LLC <br /> 4941 Village woods Dnve,Eden Prairie,MN 55347-1 So9 <br /> Phone: 952-+65-8272 rax: 952-+Z6-1971 <br /> 'icke rgolvi cke rye ng.com <br /> Boulder Wall Calculations - 6-foot Exposed Wall Height <br /> Project VEC 12-052 - July 13, 2012 <br /> Middleton Residence, 720 Tonkawa Road, Orono, MN <br /> Desian Parameters: Page 1 of 2 <br /> Retained Soil Friction Angle, 0sr:= 28deg Soil Unit Weight, -ys:= 125pcf Crest Slope, o:= Odeg <br /> Foundation Soil Friction Angle, osf:= 28deg <br /> 61 := 3.Osr 61 = 18.667-deg Rock Unit Weight, -yr:= 150pcf Surcharge Load, qs:= Opsf <br /> Exposed Height, He:= 6ft Wall Embedment, 14b := .5ft Total Height, Hr:= He+Hb <br /> Hr= 6.5 ft <br /> Top of Wall Width, Wt:= 2ft Base of Wall Width, Wba= 3ft <br /> ot= 83deg := 90deg- ot = 7-deg v := tan(osf) v = 0.532 <br /> Calculate Wall Weiaht: <br /> W1 := .5•(Wba— Wt)•He--yr•lft W1 = 4501bf W2:= Wt.He.7r•lft W2= 1.8 x 1031bf <br /> W3 := Hb•Wba•-ys•1 ft W3 = 187.51bf Ww:= WI + W2+ W3 Ww= 2437.51bf <br /> Active Earth Pressue Coefficient(Ka): <br /> Ka.— (cos(osr+ *)) <br /> 2 <br /> 2 Ka= 0.274 <br /> (cos(*))2•(cos(S1 - *))•I J 1 + [(sin(osr+ 61))-(sin(osr- (3))] <br /> [(cos(S1 — )) (cos(-tet)— <br /> Total Horizontal Force: wt <br /> Horizontal Force From Soil, Fah:= .5• Is•Ka•Hr•Hr•cos(81 — *)•lft Fah= 7091bf <br /> Horizontal Force From Surcharge, Fs:= gs•Ka-Hr•lft Fs= 0 <br /> Total Horizontal Force, Fh:= Fah+ Fs Fh= 7091bf 2 Hr <br /> Frictional Resistance: <br /> Vertical Force From Soil, Fav:= .5•-ys•Ka•Hr•Hr•sin(81 — *)•lft Fav= 146.41bf 1 <br /> Fu:= v•(Ww+ Fav) Fu= 1373.91bf <br /> Factor of Safety. Base Slidina: <br /> 3 Hb <br /> FOS Sliding, FOSS:= Fu FOSS= 1.938 <br /> Fh wb <br /> —EnsineetinS,5o/utions Foran(jnstablc world <br />