HomeMy WebLinkAboutRockery Wall - BLD Engineering / Geo-tech Reports ROCKERY WALL NOTES:
1. Rockery walls shall be constructed within the"Standard Rock Wall Construction Guidelines"of
the Associated Rockery Contractors.
2. All finished slopes must be 2:1 or flatter inclination.
3. Drainage rock and structural fill to be—4"to+2"quarry spalls.
4. Drainage system from rockery wall to be connected to on-site storm drainage system.
5. For fill placement specifications,refer to the geotechnical report prepared by Associated Earth
Sciences, dated January 23, 1990.
6. If unacceptable soil conditions are encountered during excavation of the rockery walls,the
engineer should be contacted before proceeding with construction of rockery wall.
7. Stability of excavated slopes are the responsibility of the contractor during construction of the
rockery walls.
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WestSound Engineering, Inc.
217 S.W. Wilkins Drive Phone: (360) 876-3770
Port Orchard, WA 98366 Fax: (360) 876-0439
April 1, 1999
Project No. 603
Mason County Public Works RECEIVED
411 No 5th Street
Shelton, WA 98584 APR 02 1999
MASON COUMY PUBLIC WORKS
RE: Belfair Valley Plaza Rockery Retaining Wall
TO: Public Works Staff
ATTN: Rich Geiger
Attached to this letter is the rockery design packet. This packet
includes the design calculations, rockery plan and profiles . The
calculations were performed on the tallest portion of the wall .
Several points along the height of the rockery wall were also checked
for overturning stability. The following is our results :
At Elevation = 116. 5' (2. 5' from top of wall)
Overturning F.O.S . = 10 .2
At Elevation = 112' (7' from top of wall)
Overturning F.O.S . = 2 . 38
At Elevation = 107' (bottom of wall)
Sliding F.O.S . = 1 . 5
Overturning F.O.S . = 1 . 6
Bearing Capacity F.O.S . = 1 .2
The above results firmly show that the rockery wall is in fact stable
in overturning, sliding and bearing. Sliding FOS was not calculated
for the top two points due to the nature of rockery wall
construction. The diagrams included in the calculations are for
stability analysis only. The actual geometry of the rock wall will
vary dependent on rock placement. This latitude given to the
contractor will allow for better placement of rock segments in the
wall .
For construction of the rockery wall, contractors should utilize
"Standard Rock Wall Construction Guidelines" by the Associated
Rockery Contractors . This guideline is also included in the design
packet for your information. This document fully outlines the
construction process on rockery walls .
To address the question of excavation slope behind the rockery wall,
it should be noted that this slope is the responsibility of the
contractor. The slope angle is based on the soil conditions at the
time of excavation and should be evaluated as conditions change.
The following is included in the submittal package:
1) Calculations and diagrams of the rockery wall .
2) ARC Rockery Guidelines
3) Additional Rockery Construction Notes
4) This letter of submittal
If you have any questions or comments, please feel free to contact
our office at your convenience.
Sincerely,
Y 1. Bq
Craig T. Baldwin, P.E.
P� � q`.•��
Copy:
EXPIRES 4/4/O/
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