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� � OROHO C�P <br /> Y <br /> �/ic{cer��.. �ntxineenn�� �,onsu�ting,�L� <br /> ,-;9�s�I �"�.�I_�,,e�tic �..f�} i�...��e�.t -a�irie,M�'`i 5`��`Fi-��;�� <br /> ���u.... _-,- ..C , � ,-. -'i. ,'i <br /> ...�_ a�ct��ici;.eryeax�com <br /> Boulder Wall Calculations - 4.5-Foot Total Wall Height (North all) <br /> Project VEC 14-003 - January 5, 2014 <br /> 1161 Elmwood Avenue, Orono, MN <br /> Desiqn Parameters: <br /> Page 1 of 2 <br /> Retained Soil Friction Angle, �sr:= 28deg Soil U nit Weight, -ys:= 130pcf Crest Slope, (�:= Odeg <br /> Foundation Soil Friction Angle, �sf:= 28deg <br /> Sl := 3•�sr S1 = 18.667•deg Rock Unit Weight, -yr:= 13 cf Surcharge Load, qs:= Opsf <br /> Exposed Height, He:= 4fr Wall Embedm ent, H ._ .Sft Total Height, Hr:= He + Hb <br /> Hr= 4.5 ft <br /> Top of Wall Width, Wc:= 1 ft Base of Wall Widt Wba:= 2.Sft <br /> a:= 83deg �:= 90deg— a � = 7�deg v = tan(�sf) v =0.532 <br /> Calculate Wall Weiaht: <br /> W 1 :_ .5�(Wba— Wt)�He•-yr lft W l = 4051bf W2 := Wt�He•�yr•lft W2= 5401bf <br /> W3 := Hb•Wba•-ys�I ft W3 = I 6 lbf Ww:= W 1 + W2+ W3 Ww= 1 107.5 Ibf <br /> Active Earth Pressue Coefficient(Kal: <br /> Ka:_ <br /> (cos(�s �))� <br /> 2 Ka= 0.274 <br /> (cos(�))��(cos(S1 — ���. � [(sin(�sr+ bl))�(sin(�sr— (3))]� <br /> [(cos(dl — �))�(cos(—�— �))� <br /> Total Horizontal Force: Wt <br /> Horizontal FOrCe From S0� , Fah:= .5•�ys•Ka�Hr•Hrcos(SI — �)•lft Fah= 353.41bf <br /> Horizontal Force From urcharge, Fs:= ys•Ka•Hr�1 ft Fs= 0 <br /> Total Horizontal For , Fh:= Fah+ Fs Fh= 353.41bf <br /> 2 Hr <br /> Frictional Resis nce: <br /> VertiCll FOrCe om SOiI, Fav:= .5•�ys�Ka•Hr•Hrsin(S1 — �)�lft Fav= 731bf 1 <br /> Fu:= v�(Ww Fav) Fu= 627.7 Ibf <br /> Factor of fe Base Slidin : <br /> 3 Hb <br /> FOS Sli ng, FOSs:= Fu FOSs= 1.776 <br /> � wb <br /> -�ll;f�l/7CCl7Rf�a.JtiIUL'!Ol75�O!":3R t�l75L'BL7IP.. �+Ot7Q"" ����N p[�� <br /> A � <br /> JAN -9 2�13 <br /> CITY OF ORONO <br />