HomeMy WebLinkAboutRock Bulkhead - BLD Engineering / Geo-tech Reports - 7/25/2008 • RECEIVED
JUL .3-0 2008
426 W: CEDAR STI
Rock Bulkhead Design and Calculations
July 25, 2008
Job Number:
BayMarine.Baker.BH '
Permit Number: Cti
Bld 2007 01229
37
Prepared By:
GeoResources LLC.
5007 Pacific Highway East, Suite 20
Fife, WA 98424
(253) 896-1011 phone EXPIRES 10 131 / p Si I
(253) 896-2633 fax
W. Glen Coad, PE
Principal
Prepared For: Site Address:
Ms. Mary Baker 80 East Fair Harbor Lane
80 East Fair Harbor Lane Grapeview, WA
Grapeview, WA
P/N 1210JB3100050
c/o. i<ZI a S=3 i a ovs0
Bay Marine Contractors, Inc
Attn: Dan Foss
Contents
TO BE KEPT IN THE
Calculations............................................... .../'1RCEL FIL.. ...................................................2
SitePlan ........................................................................................................................................................4
CrossSection ................................................................................................................................................5
~ Baker—Bulkhead Replacement
July 25,2008
Page 2 of 5
Calculations
Notes:
1) See attached cross section for project description
2) All calculations are per lineal foot of Bulkhead
Assumptions:
Density of rock (p): 170 pcf
Porosity of Bulkhead(n): 25%
Equivalent Fluid Pressure of Backfill (y): 35 pcf
Coefficient of friction for rock to silty sand, DM-7, Table 10-1 (p): 0.5
Dimensions:
T T= 2.Ofeet
B= 2.5 feet
H = Max Exposed Height=4.0 feet
7.V G
'
Calculate Weights:
T
H' = H + 1.5
W1 = T* H'()D* (1 —n))
= t,403 ►bs
� 1
W2 = (B —T) *H' *2* (P* (1 —n))
\Ilb Total = 1157H ib;
A
e
Baker-Bulkhead Replacement
July 25, 2008
Page 3 of 5
Resistance to Overturning:
�MA = W1 * (2+ (B - T) I + W2 *3* (B - T)
MA - Z, 1(3 -Ft • i bs
Overturning Moment:
Equivalent fluid pressure= y=35 pcf
1
Fi =2*H2 *Y
ZeD i b s
H H
M'A = Fi * 3
/F, M A=
3-74
Factor of Safety for Overturning:
A MA
= MIA =5.f> ? 2.5 • o.k.
H'Eq FP
Calculate Sliding Resistance:
Sliding force= F'R = F, = 2''b ibs
Resistance to Sliding (neglecting passive pressure):
Total Weight=W,+W2 = i s-7H 16%
Friction Force = FR = Wcocal *µ = "7 69 16S
Factor of Safety for Sliding:
FR
=F, =Zf3 >- 1.5 :• o.k.
R
c-
PARCR #121053100050
SEC05-T21N-ROlWW.M. a
3.00ACRES ro a)
CASE IN= 0 r-,
0
OD
APPROX.42'OF
REPLACEMENT. a
EXISTING FAILING
WOOD BULKHEAD
ADJOINING WOOD TO BE REMOVED EMS TING CONCRETE
FROM THE SITE. r CD
BULllalEAD SLIUlliEADTOREMAIN.
(D
EXISTING VEGETATION AND
TREES TO REMAIN.
APPROX 7TOF ADDno ON
BULKHEAD REPLACEMENT
ANDADDITION SECTIONS
SHALL BE CONSTRUCTED
OF LARGE ANGULAR ROCK
LANDMRD OF THE EXISTING NOADMNING
ANDADJOINING BULKHEAD 8uL*lEAn-
eO BLUFF CREST AND THE TOE OF THE SLOPE
AT BEACH, QUARRY SPALLS
AND FILTER FABRIC SHALL
BE USED BEHIND THE NEW
,of BUIJI(HEAD SECTIONS,
GUEST
APPROK PH-pg:
PROPERTY CR E--S D-E-NIC E
TO GRAPLMILENVI-004-RD Q::�
BULKHEAD PROPOSAL MOJECT MVE: BAKER RESDENCE NORTH DRAMM SCALE:
nLf--- SFINWRAKER MARY BAKER
BY, KLsaw PROJECTAI)ORESS:
30 E FAIR HARBOR LN 0
GRAPEEVIEW,WA ALL SME DTZ-W(M.AM IIA-M lLcqg
1,
ROCK SIZES TO BE
DETERMINED BASED
ON WAVE ENERGY
AND EXPOSURE.
1 3/4 OR GREATER
2' (min) 1
III=
� moo IIIII ,I
1 OR GREATER
-1 I II I� EXISTING NATIVE CUT
SLOPE
E o
0 12" MIN O
Uj ALL LOC
1= QUARRY SPACES
0 II (12" MIN)
GEOTEXTILE
FABRIC
FINISH I I;
GRADE ),, --� \ �II�
LO
IIIIII _,�
PLACE ROCK ON FIRM
UNDISTURBED SOILS 2.5' (min)
OR CONCRETE BASE
SKETCH NO:
PROJECT NAME: PROJECT NO: BY: DATE:
Baker Residence BM.Baker DCB 7/25/2008
CONSTRUCTION FIELD SKETCH:
GeoResources, LLC BULKHEAD
5007 Pacific Hwy. E,•Suite 20 PHONE: (253896-1011 80 E Fair Harbor Lane
Fife, WA 98424 FAX: (253;896-2633 Garpeview, WA
G E O-T 1=C I--I N I C A I
Baymadne.Baker.BH.dwg 25 Jul 2008 — 10:03 am danab