Determination of Young’s modulus of the rock mass from geophysical well logs

Abstract Geophysical logging of site investigation boreholes can provide a wide range of useful geotechnical information ranging from the formation density (gamma/gamma log) to the dynamic elastic moduli (full wave train sonic log). In this paper, the use of Young’s modulus as a measure of the deformation characteristics of the rock mass is examined. A comparison is made between the dynamic value obtained from geophysical borehole logging and the static value obtained directly from the laboratory testing of samples collected from the borehole. The data are obtained from a number of BGS boreholes. It is shown that although the prediction of the static value of Young’s modulus from the dynamic value is dependent on a knowledge of the borehole lithology, the use of the dynamic elastic moduli can yield considerable useful engineering information in the assessment of the deformation properties of the rock mass.

[1]  J. M. Ide,et al.  Comparison of Statically and Dynamically Determined Young's Modulus of Rocks. , 1936, Proceedings of the National Academy of Sciences of the United States of America.

[2]  Marshall L. Silver,et al.  Advanced Triaxial Testing of Soil and Rock , 1988 .

[3]  John I. Myung,et al.  The 3-D Velocity Log; A Tool For In-Situ Determination Of The Elastic Moduli Of Rocks , 1970 .

[4]  K. Winkler.  Estimates of velocity dispersion between seismic and ultrasonic frequencies , 1985 .

[5]  A. Marsland.  LARGE IN-SITU TESTS TO MEASURE THE PROPERTIES OF STIFF FISSURED CLAYS , 1973 .

[6]  W. L. B. Heerden.  General relations between static and dynamic moduli of rocks , 1987 .

[7]  Effects of non-linearity on the prediction of settlements of foundations on rock , 1973, Quarterly Journal of Engineering Geology.

[8]  John P. Castagna,et al.  Full Waveform Sonic Logging Techniques , 1982 .

[9]  Giulia M.B. Viggiani,et al.  MEASUREMENT OF STIFFNESS OF SOILS AND WEAK ROCKS IN LABORATORY TESTS , 1993 .

[10]  E. T. Brown.  Rock characterization, testing & monitoring: ISRM suggested methods , 1981 .

[11]  D. P. Helander,et al.  Correlation Of Elastic Moduli Dynamically Measured By In-situ And Laboratory Techniques , 1972 .

[12]  A. Fourie,et al.  Studies of the influence of non-linear stress-strain characteristics in soil-structure interaction , 1986 .

[13]  A. R. Gregory,et al.  ELASTIC WAVE VELOCITIES IN HETEROGENEOUS AND POROUS MEDIA , 1956 .

[14]  D. Entwisle,et al.  An assessment of the use of Christensen’s equation for the prediction of shear wave velocity and engineering parameters , 1990, Geological Society Special Publication.

[15]  K. Stokoe,et al.  Shear Modulus: A Time-Dependent Soil Property , 1978 .

[16]  Martin G. Culshaw,et al.  Rock mass assessment from seismic measurements , 1990, Geological Society, London, Engineering Geology Special Publications.

[17]  P. O'brien,et al.  VELOCITY DISPERSION OF SEISMIC WAVES , 1971 .

[18]  J. Castagna,et al.  Relationships between compressional‐wave and shear‐wave velocities in clastic silicate rocks , 1985 .

[19]  J. Castagna,et al.  Relationship Between Compressional And Shear-wave Velocities In Classic Silicate Rocks , 1984 .

[20]  D. Mccann,et al.  Relations between the acoustic and geotechnical properties of marine sediments , 1972, Quarterly Journal of Engineering Geology.

[21]  G. Simmons,et al.  Comparison of static and dynamic measurements of compressibility of rocks , 1965 .

[22]  V. S. Vutukuri,et al.  Handbook on Mechanical Properties of Rocks , 1977 .

[23]  M. S. King.  STATIC AND DYNAMIC ELASTIC PROPERTIES OF ROCKS FROM THE CANADIAN SHIELD , 1983 .

[24]  R. Lama.  Handbook on Mechanical Properties of Rocks , 1978 .

[25]  E. A. Eissa,et al.  Relation between static and dynamic Young's moduli of rocks , 1988 .