1887

Abstract

Summary

This study examines the shear strength behavior of two mudrocks from the Gulf of Mexico through a series of KO-consolidated triaxial compression tests. The tests are performed over a very wide range of effective stresses from 0.1 up to 10 MPa. Samples were prepared for triaxial testing by laboratory resedimentation of the core material. There is a consistent decrease in the critical state friction angle of both mudrocks with increasing stress level, and this corresponds with an increase in the value of KO (the ratio of horizontal to vertical effective stresses for one-dimensional consolidation). The strength behavior of the Gulf of Mexico mudrocks is consistent with that observed for other materials from a wide variety of geologic backgrounds. It is shown that variations in critical state friction angle with stress level can be correlated to a mudrock’s liquid limit, an easily measured index property which reflects the clay mineralogy and clay fraction of a mudrock. This finding has great practical value as it allows for a reasonable estimate of the critical state friction angle of a mudrock without having to obtain intact field samples, which is frequently infeasible in the case of deep sediments or sediments from the deep ocean.

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/content/papers/10.3997/2214-4609.20140029
2014-04-06
2021-06-17
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References

  1. Belviso, R., Federico, A. and Popescu, M.
    [2001] KO-Undrained Shear Strength Ratio of Normally Consolidated Clays from CIUC Tests. Soft Soil Engineering. Zwets & Zeitlinger, 575–579.
    [Google Scholar]
  2. Burland, J.B.
    [1990] On the Compressibility and Shear Strength of Natural Soils. Géotechnique, 40(3), 329–378.
    [Google Scholar]
  3. Casey, B. and Germaine, J.T.
    [2013] The Stress Dependence of Shear Strength in Fine-Grained Soils and Correlations with Liquid Limit. Journal of Geotechnical and Geoenvironmental Engineering, 139(10), 1709–1717. doi: 10.1061/(ASCE)GT.1943‑5606.0000896.
    https://doi.org/10.1061/(ASCE)GT.1943-5606.0000896 [Google Scholar]
  4. Casey, B., Germaine, J.T., Flemings, P.B., Reece, J.S., Gao, B. and Betts, W.
    [2013] Liquid Limit as a Predictor of Mudrock Permeability. Journal of Marine and Petroleum Geology, 44, 256–263, http://dx.doi.org/10.1016/j.marpetgeo.2013.04.008.
    [Google Scholar]
  5. Gutierrez, M., Nygard, R., Hoeg, K. and Berre, T.
    [2008] Normalized Undrained Shear Strength of Clay Shales. Engineering Geology, 99, 31–39.
    [Google Scholar]
  6. Ladd, C.C. and Varallyay, J.
    [1965] The Influence of Stress System on the Behavior of Saturated Clays during Undrained Shear. Research Report R65-11, Soils Publication No. 177, Department of Civil Engineering, Massachusetts Institute of Technology.
    [Google Scholar]
  7. Petley, D.N.
    [1999] Failure Envelopes of Mudrocks at High Confining Pressures. Geological Society of London, Special Publications, 158, 61–71.
    [Google Scholar]
  8. Seed, H.B., Woodward, R.J. and Lundgren, R.
    [1964] Fundamental Aspects of the Atterberg Limits. Journal of the Soil Mechanics and Foundations Division, ASCE, 90(SM6), 75–105.
    [Google Scholar]
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