Influence of Borehole Imperfections on Pressuremeter

by Richard J. Fragaszy, (A.M.ASCE),
James A. Cheney, (F.ASCE),

Serial Information: Journal of the Geotechnical Engineering Division, 1977, Vol. 103, Issue 9, Pg. 1009-1013

Document Type: Journal Paper


A pressuremeter is a device that applies a radical pressure to the walls of a borehole. Its use in determining the in-situ shear modulus has recently become the object of considerable research. In much of this research, a perfect borehole is assumed. Since the drilling of such a borehole may be prohibitively expensive or even impossible, knowledge of the responses of an imperfect borehole is of vital importance. Five common sources of error due to borehole imperfections are considered here: 1) Finite length of loading; 2) out-of-roundness; 3) variation in radius along the length of the hole; 4) wall-surface roughness; and 5) in homogeneity of materials near the borehole. These sources of error are not intended to be inclusive. There are other sources of error not related to borehole imperfection.

Subject Headings: Boring | Walls | Shear modulus | Field tests | Load factors | Homogeneity

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