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06-17-2024 Planning Commission Packet
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06-17-2024 Planning Commission Packet
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Last modified
6/26/2024 9:48:31 AM
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6/18/2024 11:24:34 AM
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Boulder Wall Calculations - 3-Foot Total Wall Height, No Crest Slope <br />Project VEC 24-055 - April 15, 2024 <br /> 4745 North Shore Drive, Orono, Minnesota <br />Page 1 of 3 Design Parameters: <br />Retained Soil Friction Angle,ϕsr 30degSoil Unit Weight,γs 125pcfCrest Slope,β 26.6deg <br />Foundation Soil Friction Angle,ϕsf 30degSurcharge Load qs 0 <br />lbf <br />ft2 <br />δ1 2 <br />3 ϕsrδ1 20 degRock Unit Weight,γr 145pcf <br />Exposed Height,He 2ftWall Embedment,Hb 1ftTotal Height,Hr He Hb <br />Hr 3ft <br />Top of Wall Width,Wt 1ftBase of Wall Width,Wba 2ft <br />α 83degψ 90deg αψ 7 degυ tan ϕsf()υ 0.577 <br />Stone reduction friction factor μb.8Leveling Pad depth:LPd 1ft <br /> Calculate Wall Weight: <br />W1 .5 Wba Wt()Heγr1ftW1 145lbfW2 Wt Heγr1ftW2 290lbf <br />W3 Hb Wbaγs1ftW3 250lbfWw W1 W2W3Ww 685lbf <br /> Active Earth Pressue Coefficient (Ka): <br />Ka cos ϕsr ψ()()2 <br />cos ψ()()2 cos δ1 ψ()()1 sin ϕsr δ1()( ) sin ϕsr β()()[] <br />cos δ1 ψ()( ) cos ψβ()()[] <br /> <br />2 <br /> <br />Ka 0.435 <br /> Total Horizontal Force: <br />Horizontal Force From Soil,Fah .5 γsKaHrHrcos δ1 ψ()1ftFah 238.2 lbf <br />Horizontal Force From Surcharge,Fs qs KaHr1ftFs 0 <br />Total Horizontal Force,Fh Fah FsFh 238.2 lbf <br /> Frictional Resistance: <br />Vertical Force From Soil,Fav .5 γsKaHrHrsin δ1 ψ()1ftFav 55lbf <br />Fu υ Ww Fav()Fu 427.2 lbf <br /> Factor of Safety, Base Sliding: <br />FOS Sliding,FOSs Fu <br />FhFOSs 1.794 <br />44
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