Department of Civil Engineering
The University of Texas at Austin
Austin, TX 78712
Phone 512-471-4929
FAX 512-471-6548
B. S., University of Michigan, 1966
M. S., University of Michigan, 1967
Ph. D., University of Michigan, 1972
ACADEMIC EXPERIENCE
University of Texas at Austin, Jennie C. and Milton T. Graves
Chair in Engineering, 1/00 to present
University of Texas at Austin, Cockrell Family Regents Chair No. 9, 9/97 to 12/99
University of Texas at Austin, Brunswick-Abernathy Regents Professor, 9/85 to 8/97
University of Texas at Austin, Professor, 9/83 to 8/85
University of Texas at Austin, Associate Professor, 9/78 to 8/83
University of Texas at Austin, Assistant Professor, 9/73 to 8/78
University of Massachusetts, Assistant Professor, 1/72 to 8/73
University of Michigan, Instructor, 9/71 to 12/71
PROFESSIONAL REGISTRATION
Registered Professional Engineer: State of Texas
SUMMARY OF EXPERIENCE
Dr. Stokoe has been working in the areas of in situ seismic measurements, laboratory measurements of dynamic material properties, and dynamic soil-structure interaction for the past 35 years. He was instrumental in developing the crosshole seismic method for in-situ shear wave velocity measurement to the method that has been adopted as the standard by the American Society for Testing and Materials (ASTM D4428M) and the method that is used by geotechnical engineering firms worldwide. He has also developed a combined torsional shear/resonant column system which is now used by many universities and private firms in the U.S., Europe and Asia to evaluate dynamic material properties.
In the last 30 years, Dr. Stokoe has conducted major research efforts in the areas of: 1. nondestructive testing (NDT) of pavements, runways and geotechnical systems, and 2. laboratory evaluation of soil and rock stiffnesses under cyclic and dynamic loading conditions. He and his colleagues have developed the Spectral-Analysis-of-Surface-Waves (SASW) method for testing geotechnical and pavement systems and structural components. Dr. Stokoe has conducted major studies using the SASW method to evaluate earth dams for the U.S. Bureau of Reclamation, the Icelandic government and Delft Geotechnical Laboratories and to evaluate debris slides for the U.S. Geological Survey and the Italian government. He has also conducted comparison studies of the downhole seismic method with the SASW method for the U.S. Geological Survey and has performed extensive SASW investigations at the proposed high-level nuclear storage site at Yucca Mountain for the U.S Department of Energy.
Dr. Stokoe has participated in numerous demonstration projects involving SASW testing of airport runways and taxiways over the past 20 years. Testing has been performed at McDill, Homestead, and Tyndell Air Force Bases. Testing was also performed at the Cannon International Airport in Reno, Nevada and the Sonoma County Airport in Santa Rosa, California. Over the past 10 years, Dr. Stokoe has applied the SASW method at John F. Kennedy Airport to evaluate changes beneath runways and taxiways due to micro-tunneling activities.
As part of his activities in NDT of pavements, Dr. Stokoe and his colleagues have been actively involved in developing dynamic linear and nonlinear analyses for modeling and understanding falling weight deflectometer (FWD) measurements. He and Dr. Roesset have presented and published papers at the Transportation Research Board Meeting in this area. They have been successful in extracting the static pavement response from the dynamic FWD test as well as calculating the depth to bedrock from free vibrations of the pavement system in 120- to 180-ms long records.
Over the past 10 years, Dr. Stokoe has been involved in the development of the Rolling Dynamic Deflectometer (RDD) with funding from Texas DOT and federal agencies. The purpose of this device is to perform continuous profiles of pavement stiffness “on-the-fly.” This deflectometer operates at speeds around 2 km/hr (about 1.2 mph) and presently represents a “one-of-a-kind” piece of equipment. Most recently, the RDD has been used to profile runways at the Dallas-Fort Worth (DFW) Airport, the Portland Airport, the Seattle-Tacoma International Airport, the Atlanta International Airport and various highway pavement sections in Texas and Pennsylvania.
The laboratory studies with which Dr. Stokoe has been involved can be divided into two groups. The first group has dealt with the use of resonant column/torsional shear (RCTS) equipment to evaluate the nonlinear shear modulus and material damping of soils. Most recently, Dr. Stokoe has completed three major laboratory studies in which nonlinear dynamic soil properties were being evaluated for: 1. the Savannah River site for the Westinghouse Corporation, 2. the Electric Power Research Institute, and 3.the ROSRINE (Resolution of Site Response Issures in the 1994 Northridge Earthquake) project. These studies have been directed towards evaluating the response of soil sites during earthquake shaking. These results were combined with other tests to develop a new nonlinear soil model (including frequency-dependent material damping). Presently, dynamic rock properties are being evaluated with the RCTS equipment for the proposed Yucca Mountain High-Level Nuclear Waste site.
The second group of laboratory studies has dealt with axially loading specimens, either with transient pulses or continuous cycling for measurement of Young's resilient, constrained and shear moduli. This work has been conducted with funding from the Air Force Office of Scientific Research, the United States National Science Foundation, the California DOT, and the Texas DOT. Much of the recent work has been performed in conjunction with resilient modulus testing of subgrade soils. Further, Dr. Stokoe has developed synthetic specimens which the SHRP project used in the evaluation of resilient modulus equipment.
Dr. Stokoe is also actively involved in research dealing with ground motions associated with blasting, and exploration activities as well as construction and railroad operations. His research activities also involve integrity investigations of deep foundations and structural components by wave propagation methods. He has adapted the SASW method for testing concrete structural elements to evaluate damage and has been awarded Patent No. SN 071 462, 404 for In Situ Testing with Surface Seismic Waves of Materials Having Properties that Change with Time.
Finally, Dr. Stokoe is the PI (along with co-PIs Prof. Rathje and Prof. Wilson) on a 4-year, $3 million NSF grant in the NEES (Network for Earthquake Engineering Simulation) program. This project will have a substantial impact on the geotechnical earthquake engineering community in the United States. The project involves the development of large-scale mobile field equipment for dynamic loading of geotechnical and structural systems. The equipment, which became operational in October 2004, presents field capabilities that never before existed and will be used in research, with the oversight of the University of Texas team, by universities and governmental researchers around the U.S. The equipment will be operated by the UT team over the next 10 years, with a yearly operating budget in excess of $700K from NSF.
SCIENTIFIC AND PROFESSIONAL SOCIETY MEMBERSHIP
American Society of Civil Engineers
American Society for Nondestructive Testing
American Society for Testing and Materials
Earthquake Engineering Research Institute
Environmental and Geophysical Engineering Society
International Society of Soil Mechanics and Geotechnical Engineering
Seismological Society of America
Society of Exploration Geophysicists
Transportation Research Board
Society of Professional Engineers
HONORS AND AWARDS
National Science Foundation Traineeship, 1967, 1968, 1969
Traveling Scholar, University of Illinois, 1969
Woodrow Wilson Fellowship, University of Michigan, 1970
Distinguished Achievement Award, Graduate Student in Civil Engineering, 1971
Outstanding Paper Award, Texas Section of ASCE: Sept., 1974; April, 1975; Sept., 1977
Ervin Sewell Perry Student Appreciation Award, 1977
Student Engineering Council Teaching Achievement Award, May, 1977
Engineering Foundation Award, November, 1977
Outstanding Service Award, American Society of Civil Engineers, 1979
Invited State-of-the-Art Speaker:
Society of Exploration Geophysicists, 1978 and 1981
American Society of Civil Engineers, 1980
International Symposium on Borehole Geophysics, Tucson, Arizona, February 1990
Italian Geotechnical Conferences in Turin, Italy, 1989 and 1990
Ardaman Geotechnical Lecture, The University of Florida, Gainsville, Florida 1990
Fortieth Annual Geotechnical Engineering Conference, Minneapolis, Minnesota 1992
Italian Society of Applied Geophysics, Torino, Italy, 1992
Second Italian Meeting of Young Researchers in Applied Geology, Rome, Italy, 1992
XIII Inter. Conf. on Soil Mechanics and Foundation Engineering, New Delhi, India, 1994
Inter. Symp. on Prefailure Deformation Characteristics of Geomaterials, Sapporo, Japan 1994
Kyung Hee University, Hyung Gee-Do, Korea, Sept. 1995
The Asian Pacific Petroleum/Gas Offshore Technology Workshop (HK), Nov. 1995
Second International Conference on Earthquake Geotechnical Engineering, Lisbon 1999
Inter. Conf. on Geotechnical and Geological Engineering, Melbourne, Australia, 2000
Distinguished Advisor Award, February 1982
Walter L. Huber Civil Engineering Research Prize, ASCE, 1983
Student Appreciation Award, ASCE, Student Chapter, 1985
Outstanding Service Award, Austin Chapter of ASCE, 1986
Visiting Professor at University of Naples, Italy, May-June, 1987
National Geotechnical Board, National Research Council, 1988-1992
U.S. Air Force Pavements Research Advisory Group, 1988
Best Offshore Technology Conference Geophysics Paper Award from Society of Exploration Geophysicists, September 1990
Best Paper Presented at the 1991 Annual Meeting of the Society of Exploration Geophysicists
Distinguished Lecture, Virginia Polytechnic Institute, Blacksburg, VA, April, 1997
Elected to the National Academy of Engineering in 1997
Billy and Claude R. Hocott Distinguished Centennial Engineering Research Award, 1997
Distinguished Lecture, University of California Berkeley, May, 2001
Distinguished Lecture, University of Kentucky, May 2002
Earthquake Engineering Research Institute Distinguished Lecturer for 2004
Lectured at: St. Louis Chapter, University of Illinois, Purdue University, University of Michigan, Cornell University, University of Puerto Rico-Mayaguez, Texas A&M University
Ervin Sewell Perry Student Appreciation Award, 2004
George Sowers Lecturer, Georgia Tech. University, 2004
Distinguished Lecture, University of Massachusetts, 2004
Engineering Alumni Society Merit Award, University of Michigan, 2004
Harold Mooney Award, Near-Surface Geophysics Section of SEG, 2004
USUCGER Distinguished Researcher Award, 2005
PUBLICATIONS (Selected Publications Dated After January 1, 1990)
1. Stokoe, K.H., II, Wright, S.G., Roesset, J.M., Gauer, R. and Sedighi-Manesh, M., “In Situ Measurement of Stiffness Profiles in Ocean Bottom Materials Using the SASW Method,” Proceedings, 1990 Offshore Technology Conference, Houston, Texas, OTC Paper No. 6234.
2. Olson, L.D., Wright, C. and Stokoe, K.H., II,“Strides in Nondestructive Testing,” (with L.D. Olson and C. Wright), Civil Engineering Magazine, ASCE, Vol. 60, No. 6, May 1990, pp. 52-55.
3. Bay, J.A. and Stokoe, K.H., II, “Field Determination of Stiffness and Integrity of PCC Slabs Using the SASW Method,” Proceedings, Conference on Nondestructive Evaluation of Civil Structures and Materials, University of Colorado at Boulder, October 1990, pp. 71-85.
4. Rix, G.J. and Stokoe, K.H., II “Stiffness Profiling of Pavement Subgrades.” Transportation Research Record 1235, 1990, pp. 1-9.
5. Roesset, J.M., Chang, D.-W., Stokoe, K.H., II and Aouad, M., “Modulus and Thickness of the Pavement Surface Layer from SASW Tests,” Transportation Research Record 1260, 1990, pp. 53-63.
6. Claros, G., Hudson, W.R. and Stokoe, K.H., II, “Modifications to the Resilient Modulus Testing Procedure and the Use of Synthetic Samples for Equipment Calibration,” Transportation Research Record 1278, 1990, pp. 51-62.
7. Stokoe, K.H., II, Kim, D.-S. and Andrus, R.D., “Development of Synthetic Specimens for Calibration and Evaluation of MR Equipment.” Transportation Research Record 1278, 1990, pp. 63-71.
8. Pezo, R.F., Kim, D.-S., Stokoe, K.H., II and Hudson, “Developing a Reliable Resilient Modulus Testing System,” Transportation Research Record 1307, pp 90-98, 1991.
9. Wright, S.G. and Roesset, J.M. and Stokoe, K.H., II “Analytical and Experimental Studies of Surface Wave Measurements to Detect Gas Hydrates Offshore,” Proceedings, 1991 Offshore Technology Conference, OTC Paper No. 6535, Vol 1, 1991, pp. 317-324.
10. Roesset, J.M., Chang, D.-W. and Stokoe, K.H., II, “Comparison of 2-D and 3-D Models for Analysis of Surface Wave Tests,” Proceedings, 5th International Conference on Soil Dynamics and Earthquake Engineering, Karlsruhe, Germany, 1991, pp. 111-126.
11. Chang, D.W., Kang, Y.V., J.M. Roesset and Stokoe, K.H., II, “Effect of Depth to Bedrock on Deflection Basins Obtained with Dynaflect and FWD Tests,” Transportation Research Record 1355, pp 8-16, 1992.
12. Kim, D.S. Stokoe, K.H., II, “Characterization of Resilient Modulus of Compacted Subgrade Soils Using Resonant Column and Torsional Shear Tests,” Transportation Research Record 1369, pp 83-91, 1992.
13. Chang, D.W., Roesset, J.M. and Stokoe, K.H., II, “Nonlinear Effects in Falling Weight Deflectometer Tests,” Transportation Research Record 1355, pp 1-7, 1992.
14. Bay, J.A. and Stokoe, K.H., II, “Field and Laboratory Determination of Elastic Properties of PCC Using Seismic Techniques,” Transportation Research Record 1355, pp 67-74, 1992.
15. Bowen, B.R. and Stokoe, K.H., II, “Evaluation of Cracked and Repaired Beams and Columns Using Surface Stress Waves,” Proceedings of the Tenth World Conference on Earthquake Engineering, Madrid, Spain, 1992, pp. 2713-2718.
16. Olson, L.D., Sack, D.A., Stokoe, KH, II and Buchinski, K.W., “Stress-Wave Nondestructive Testing of Tunnels and Shafts,” (with Olson, L.D. and Sack, D.A.), Transportation Research Record, No. 1415, 1993, pp 88-94.
17. M.F., Aouad, K.H. Stokoe, II, and R.C. Briggs, “Stiffness of the Asphalt Concrete Surface Layer from Stress Wave Measurements,” Transportation Research Record 1384, 1993, pp 29-35.
18. Kalinski, M.E., Stokoe, K.H., II, Jirsa, J.O. and Roesset, J.M., “Nondestructive Identification of Internally Damaged Areas of Concrete Beam Using the SASW Method,” Transportation Research Record, 1458, 1994, pp 14-19.
19. Bay, J.A., Stokoe, K.H., II and Jackson, J.D., “Development of a Rolling Dynamic Deflectometer for the Study of Stiffness Variability and Nonlinear Behavior in Pavements,” Transportation Research Record No. 1473,1995, pp. 43-544.
20. E. Kavazanjian, K.H. Stokoe, II and J. Bray, “In Situ Shear Wave Velocity of Solid Waste Material From Surface Wave Measurements,” Proceedings, Second International Congress on Environmental Geotechniques, Osaka, Japan, November, 1996.
21. E.G. Brignoli, M Gotti, and K.H. Stokoe, II, “Measurement of Shear Waves in Laboratory Specimens by Means of Piezoelectric Transducers,” Geotechnical Testing Journal, ASTM, Vol. 19, No. 4, December 1996, pp. 384-397.
22. K.H. Stokoe, II, B. Lee, B.L. Rosenblad, and S.G. Wright, “Analytical Study of Surface Wave Testing Along the Seafloor, Proceedings, 1997 Offshore Technology Conference, OTC 8326, Houston, TX, May 5-8, 1997.
23. K.H. Stokoe, II, E.G.M. Brignoli, C. Fretti, M. Jamiolkowski and S. Pedroni, “Stiffness of Gravelly Soils at Small Strains,” Proceedings, XIVth International Conference on Soil Mechanics & Foundation Engineering, Hamburg, Germany, September, 1997.
24. R.D. Andrus and K.H. Stokoe, II, “Liquefaction Resistance Based on Shear Wave Velocity,” Proceedings, NCEER Workshop on Evaluation of Liquefaction Resistance of Soils, T.Y. Youd and I.M. Idriss, Eds., Buffalo, NY, 1997.
25. Kalinski, M.E., Stokoe, K.H., II, Young, Y.L., and Roesset, J.M., “Borehole SASW Testing to Evaluate Log (Gmax) - Log (s‘) Relationships in Situ,” Nondestructive and Automated Testing for Soil and Rock Properties, ASTM STP 1350, W.A. Marr and C.E. Fairhurst, Eds., American Society for Testing and Materials, 1998.
26. K.H. Stokoe, II, J.A. Bay, M.T. McNerney, and B.F., McCullough, “Continuous Profiling of Runway and Taxiway Pavements with the Rolling Dynamic Deflectometer (RDD) at the Dallas-Fort Worth International Airport,” 77th Annual Meeting, Transportation Research Record No. 1639, 1998, pp. 102-111.
27. N.J. Lee, K.H. Stokoe, II, M.T. McNerney, and B.F. McCullough, “In-Situ Evaluation of Layer Stiffnesses in Airport Pavements by Crosshole Seismic Tests,” Transportation Research Record No. 1639, 1998, pp. 62-72.
28. B.A. Luke and K.H. Stokoe, II, “Application of the SASW Method Underwater,” Journal of Geotechnical and Geoenvironmental Engineering, American Society of Civil Engineers, Vol. 124 No. 6, June, 1998, pp. 523-531.
29. B.A. Luke K.H. Stokoe, II, J.A. Bay, N.J. Lee and P.P. Nelson, “Seismic Measurements to Investigate Disturbed Rock Zones,” Proceedings, Third National Conference of the ASCE Geo-Institute, Urbana-Champaign, IL, June, 1999, pp. 303-314.
30. Stokoe, K.H.,II, M.B Darendeli, R.D. Andrus and L.T. Brown, “Dynamic Soil Properties: Laboratory, Field and Correlation Studies,” Theme Lecture, Second International Conference Earthquake Geotechnical Engineering, Vol. 3, Lisbon, Portugal, June, 1999, pp. 811-845.
31. Bay, J.A. and Stokoe, K.H., II, “Continuous Profiling of Flexible and Rigid Highway and Airport Pavements with the Rolling Dynamic Deflectometer,” Nondestructive Testing of Pavements and Backcalculation of Moduli: Third Volume, ASTM STP 1375, S. D. Tayabji and E. O. Lukanen, Eds., American society for Testing and Materials, Philadelphia, 1999 pp. 429-443.
32. Stokoe, K.H., II, Allen, J.J., Bueno, J.L., Kalinski, M.E. and Myers, M.L., “In-Situ Stiffness and Density Measurements of Thick-Lift Unbound Aggregate Bases,” Proceedings, Workshop on Modeling, and Advanced Testing for Unbound Granular Material, Lisbon, Portugal, January 21-22, 1999.
34. Andrus, R.D. and Stokoe, K.H., II, “SASW Testing to Delineate Potentially Liquefiable Zones and Evaluate Remediation Measures,” 7th U.S. – Japan Workshop on Earthquake Resistance Design of Lifeline Facilities and Contermeasures Against Liquefaction, Seattle, WA., August 15-17, 1999,
35. Stokoe, K.H., II and Santamarina, C., “The Increasing Role of Geophysically-Based Tests in Geotechnical Engineering,” International Conference on Geotechnical and Geological Engineering, GeoEng 2000, Melbourne, Australia, November 19-24, 2000
36. Bay, J.A., Stokoe, K.H., II, McNerney, M.T., Soralump, S. and VanVleet, D, Rozycki, D.K. “Evaluation of Runway Pavements at the Sea-Tac International Airport Using Continuous Deflection Profiles Measured with the Rolling Dynamic Deflectometer,” Transportation Research Record No. 1716, 2000, pp 1-9.
37. Aouad, M., Stokoe, K.H., II and Joh, S.-H., “Estimating Subgrade Stiffnessess and Bedrock Depth from Combined FWD and Simplified SASW Measurements,” Transportation Research Record No. 1716, 2000, pp 40-48.
38. Stokoe, K.H., II, Bay, J.A., Rosenblad, B.L., Murphy, M.R., Fults, K.W. and Chen, D.-H., “Super-Accelerated Testing of a Flexible Pavement with the Stationary Dynamic Deflectometer (SDD),” Transportation Research Record No. 1716, 2000, pp 98-107.
39. Andrus, D.R. and Stokoe, K.H., II “Liquefaction Resistance of Soils from Shear-Wave Velocity,” ASCE, Journal of Geotechnical and Geoenvironmental Engineering, Vol. 126, No. 11, November, pp 1015-1025, 2000.
40. Darendeli, M.B., Stokoe, K.H., II, Rathje, E.M. and Roblee, C.J., “Importance of Confining Pressure on Nonlinear Soil Behavior and Its Impact on Earthquake Response Predictions of Deep Sites,” XVth International Conference on Soil Mechanics and Geotechnical Engineering, August 27-31, 2001, Istanbul, Turkey.
41. Lee, J. L. Y., Stokoe, K.H., II, Murphy, M.R., and Rozycki, D.K. “Application Of The Rolling Dynamic Deflectometer To Project-Level Pavement Studies,” 81st Annual Meeting, Transportation Research Board, January 13-17, 2002, Washington, D.C.
42. Brown, L.T., Boore, D.M. and Stokoe, K.H., II, “Comparison of Shear-Wave Slowness Profiles at 10 Strong-Motion Sites from Noninvasive SASW Measurements and Measurements Made in Boreholes,” Bulletin of the Seismological Society of America, Vol. 92, No. 8, pp. 3116–3133, December 2002.
43. Kalinski, M. E. and Stokoe, K. H., II “In Situ Estimate of Shear Wave Velocity using the Borehole SASW Tool,” Journal of Geotechnical and Geoenvironmental Engineering Vol. 129, Issue 6, pp. 529-535, June 2003.
44. Stokoe, K.H., II, Rosenblad, B.L., Bay, J.A., Redpath, B., Diehl, J.G., Steller, R.A., Wong, I.G., Thomas P.A. and Luebbers,M., “Comparison of VS Profiles from Three Seismic Methods at Yucca Mountain,” Proceedings, Volume I, Soil and Rock America 2003, June 22-25, 2003, Cambridge, MA, pp. 299-306.
45. Rathje, E.M., Stokoe, K.H., and Rosenblad, B.L., “Strong Motion Station Characterization and Site Effects During the 1999 Earthquakes in Turkey,” Earthquake Spectra, Earthquake Engineering Research Institute, accepted for publication in Volume 19(3), August, 2003.
46. Stokoe, K.H., II, Rathje, E.M., Wilson, C.R., Rosenblad, B.L. and Menq, F.-Y., 2004, “Development of the NEES Large-Scale Mobile Shakers and Associated Instrumentation for In Situ Evaluation of Nonlinear Characteristics and Liquefaction Resistance of Soils” 13th World Conference on Earthquake Engineering, Vancouver, Canada, August.
47. Stokoe, K.H., II, Rosenblad, B.L., Wong, I.G., Bay, J.A., Thomas, P.A. and Silva, W.J., 2004, “Deep Vs Profiling Along the Top of Yucca Mountain Using a Vibroseis Source and Surface Waves,” 13th World Conf. on Earthquake Engineering, Vancouver, Canada, August.
48. Andrus, R.D. and Stokoe, K.H., II, 2004, “Guide for Shear-Wave-Based Liquefaction Potential Evaluation,” Earthquake Spectra, Vol. 20, No. 2, pp. 285-305.