Perimeter Load Transfer in Drilled Shafts in the Eagle Ford Formation

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by Michael W. O'Neill, Univ of Houston, Houston, United States,
Khaled M. Hassan, Univ of Houston, Houston, United States,

Document Type: Proceeding Paper

Part of: Design and Performance of Deep Foundations: Piles and Piers in Soil and Soft Rock

Abstract: Results of six full-scale compression loading tests at four sites in the Dallas area are considered. Compressive strengths (qc) of the rock varied considerably (in the range of 0.75 - 3 MPa). A decreasing ratio of maximum unit perimeter load transfer (fmax) to qc, although the ratios were much lower than those for the Melbourne Mudstone at all vales of qc. A complex combination of borehole roughness, shearing strength of the parent material and degradation of the soft rock to soil during drilling (termed 'smear') contribute to the values of the ratio.

Subject Headings: Load tests | Load transfer | Strength of materials | Rocks | Compression tests | Soil strength | Chemical degradation |

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