Optimized Drilled Shaft Design through Post-Grouting: Shorten That Shaft for Better Performance

by Antonio Marinucci, P.E., Ph.D., (M.ASCE), Independent Consultant; Brooklyn, NY, antmarinucci@gmail.com,
Silas Nichols, P.E., (M.ASCE), Principal Bridge Engineer; Washington, DC, silas.nichols@dot.gov,


Serial Information: Geo-Strata —Geo Institute of ASCE, 2016, Vol. 20, Issue 3, Pg. 38-42


Document Type: Feature article

Abstract: Tip post-grouting is a technique used to inject, under pressure, a neat cement grout beneath the base of a drilled shaft. This method enhances or improves axial load-displacement performance by increasing the axial resistance of the shaft and/or by improving the mobilization of shaft resistance. Potential benefits of post-grouting drilled shafts include: reduced settlement under loading; decreased length of the shaft; better alignment of load transfer curves for end and side resistance; "usable" tip resistance in design computations; improved ground beneath the base of the shaft.

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