HomeMy WebLinkAboutBLD2008-00167 Geotechnical Report • •
Slope Stability Calculations (at Cross-section A-A) cP/201 °
F� 1,''A
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60 ft
0 4, 3-0758
��" Rotational Failure �. ��GrsrE
Plane SIONALV;!-
Not to scale(NTS)
EXPIRES /
/Alpha=31 deg(60%slope)
1. Compute factor of safety(FS)against slipping-Static Case(Ref: "Stability Charts for Uniform Slopes"by
Radoslaw L. Michalowski, F.ASCE) - Stability Charts have been included with this slope stability analysis.
From Figure 3"Stability charts for uniform slopes"the following parameters are known for native silty
glacial till materials:
c(cohesion)=250 psf, gamma(insitu unit density)= 139 pcf, H(height of slop, 'l , y T'
phi(internal friction angle)=31 deg, then il- , '. .,�,.L .- w �ILi ,
c/[gamma x H x tan(phi)]=250/(139 x 60 x tan 31)=0.050
5 av
Then for a 31 deg slope from Fig. 3:
F/tan(31)=2.50 or, F Factor of Safety= 1.502>1.500 OKAY ,IEFF r. c1 C°Iti
ICI
2. Compute factor of safety(FS)against slipping-Quasi-Static(seismic)Case(Ref: "Stability Charts for Uniform Slopes"
by Radoslaw L. Michalowski, FASCE) - Stability Charts have been included with this slope stability analysis.
From Figure 4"Stability charts for uniform slopes"the following parameters are known for native glacial
till materials:
c(cohesion)=250 psf, gamma(insitu unit density)= 139 pcf, H(height of slope)=60 ft,
phi(internal friction angle)=31 deg, then
c/[gamma x H x tan(phi)]=250/(139 x 60 x tan 31)=0.050
Then for a 31 deg slope from Fig.4 for a quasi-static analysis coefficient of 0.1:
F/tan(31)=2.2 or F= 1.32,
For a quasi-static analysis coefficient of 0.2:
F/tan(31)=1.7 or F= 1.02
As a result,for a quasi static analysis coefficient of 0.15, the Factor of Safety, F=(1.32+1.02)/2=1.170>1.100 OKAY
Slope Stability Analysis for property located
at 2682 Dosewallips Rd, Brinnon,WA(#6022 85001) Prepared by: Morta Engineering&Testing,FOB 250,Ocean Shores,WA 98569
Prepared for: Lorin and Diane Falk (360)289-0958, (800)590-0958,(360)289-9682 fax,Smorta@AOL.com
6244'Ooodhew Road
Sedro Woolley,WA 98284
(360)243-6757,(360)770-7701 cell Aug.20,2007 I Analyzed by: SPM Page 3 of 4
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Geotechnical Engineering Report for Property Located Prepared by: MET(Mona Engineering and Testing)
at 2682 Dosewallips Rd, Brannon,WA P.O.Box 250,Ocean Shores,WA 98569-0250 Scale 1"=25'
Parcel#6022 85001
_--(Parcel ---- _-- ) ---- (800)590-0958,(360)289-968l fax, Smorta@AOL.com 11111111-_t_M_1
Prepared for: Loren and Diane Falk p' 10' 20' 30' 40' 50'
6244 Goodhew Rd,Sedro Woolley,WA 98284
(360)243-6757,(360)770-7701 cell August 20,2007 Designed by: SPM Page 2 of 4
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GLULAM BridgeDesign for Property Located
9 P rtY Prepared by: MET(Mona Engi►ie`eiing and, ng)
at 2682 Dosiwallups Rd, Brinnon,WA P.O.:Pax 250,Ocean ShorQA 98569-0250 Scale 1"=50'
Prepared for: Loren and Diane Falk morta com
(800 590-0 ,
6244 Goodhew Road 0' 20' 40' 60' 80' 100'
Sedro Woolley,WA 98284 August 20,2007 Designed by: SPM Page 4 of 4
(360)243-6757,(360)770-7701 cell