CS0013 - Natchez Bluff - Keystone

“bench” or shelf 25’ out toward the river from the stabilizedwall. The section above this bench was cut back 10 ft. (3.0m) and the remaining area was stabilized with geogrid soilreinforcement and filled with 6,000 lbs. of lightweight aggregate,topped with sod and plants. One sidewall of the sectionis the original bluff, and the back wall of the section is theshotcrete-covered soil-nailed wall.View of wall with soil nailed “bench” below.Conventional fill, such as sand, would have cost about $5 percubic yard placed, while the cost of the lightweight aggregatesolution was approximately $30 per cubic yard placed. Thislightweight material was needed to solve the problem due tothe inability of the underlying wall to carry the load of theconventional fill. Combining these various stabilization systemswas an economical and yet ideal solution.top of the Keystone wall provides new front yards for bluff homeowners.EL. 226.3TOP OF WALLKEYSTONEMINI CAP20.0' (TYP.)IMPERVIOUS FILL ZONEThe1.0' (TYPICAL)0.5' (TYP.)SOIL NAIL SYSTEM(BY OTHERS)Construction began with a wire formfaced temporary wall designed by the soilFACE OF SOILNAIL WALLreinforcement supplier. Because theWALLHEIGHTKEYSTONESTANDARDUNITTENSAR UNIAXIAL GEOGRIDKeystone Retaining Wall uses bottom-upLIGHT WEIGHTAGGREGATE FILLconstruction and the soil nail system usestop-down, the work proceeded simulta-TOP OFLEVELINGPADEL. 200.0neously.LEVELINGPADFOUNDATION SOILGEOGRID EMBEDMENT LENGTHSOIL NAIL SYSTEM(BY OTHERS)Cross section shows soil nailed bluff below and geogrid soil reinforced Keystone above.4444 West 78th Street • Minneapolis, MN 55435 • www.keystonewalls.com • (952) 897-1040 • (952) 897-3858 FAX • (800) 747-8971CS-0013 • Printed in the U.S.A. • ©2000 KEYSTONE Retaining Wall Systems, Inc. • PatentedReprinted 1/02