Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
(OP)
I am working on a project that uses grouted tie-backs in conjunction with a sheet pile retaining wall. The tie-backs are being installed in a material that has been classified as Poorly Graded Sand (Medium Dense) with the boring log showing sand and medium to fine gravel with cobbles and boulders noted. The tie-backs are being installed using a 7" diameter temporary casing. A few of the tie-backs have already been installed and much larger quantities of grout than anticipated were required during the intial grouting before a return was seen at the top of the casing. The worst case was 13 x the area of the casing/hole and the best case was 4 x the area of the casing.
My question consists of two parts:
1) Based on the soil information (before construction began), what would be a reasonable number used to estimate the amount of grout anticipated per hole?
2) Is there a better solution to implement when a much larger amount of grout is required than planned?
Any guidance is appreciated!
My question consists of two parts:
1) Based on the soil information (before construction began), what would be a reasonable number used to estimate the amount of grout anticipated per hole?
2) Is there a better solution to implement when a much larger amount of grout is required than planned?
Any guidance is appreciated!





RE: Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
RE: Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
www.PeirceEngineering.com
RE: Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
At this point I'm trying to determine what a good estimate for the grout should have been to determine how much of an overage should be paid for as well as try to determine if another method should be used for the remaining anchors.
RE: Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
RE: Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
RE: Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
www.PeirceEngineering.com
RE: Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
RE: Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
RE: Grouted Tie-backs in Soil for a Sheet Pile Retaining Wall
On most permanent anchor projects, especially for DOT work, grout cube testing is required. However, what difference does the cube strength make if every anchor is successfully tested? If the anchor passes it load test, the grout must be OK. Also, results from grout testing are very dependent on factors other than the grout mix. Various size grout cubes or cylinder can affect the tested grout strength. Improper sample preparation, storinf, transportation, and curing all can have a negative effect on the test results. Also, by the time the grout cubes are tested, it may be too late to return to that tieback location to supplement or replace one or more anchors. What do you do if a series of anchors passes their load tests but their cubes come up short in strength? The importance of grout cube tests is overstated.
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