IN SITU INVESTIGATION OF SHEAR WAVES IN SOIL MEDIA. SCHOOL OF ENGINEERING REPORT

This thesis presents an investigation of the strain dependent nature of the shear modulus and damping in soils, using a large strain mechanical impulse generator capable of operating at depths of up to 20 metres. It also describes the design and development of support field equipment and sensor packages capable of generating and recording the ground or particle motion generated in both the horizontal and the vertical direction (the SH and SV polarised shear waves respectively). A digital data acquisition package controlled by an IBM-PC microcomputer is also developed to enable data acquisition at speeds of up to 4kHz per channel. Interpretation and analysis of the results is effected by developing a cylindrical wave propagation theory using a Bessel function solution technique. A correction factor is also derived, enabling the use of the plane wave theory while analysis data, to be corrected for cylindrical wave propagation. Field determined results are compared to those given by free vibration torsion testing of undisturbed samples taken from the site of testing. Conclusions about the effectiveness of the site equipment, investigations technique and analysis procedures are then provided.

  • Availability:
  • Corporate Authors:

    University of Auckland

    Department of Civil Engineering, Private Bag
    Auckland 1,   New Zealand 
  • Authors:
    • Plested, M L
  • Publication Date: 1985-9

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00604885
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Feb 28 1991 12:00AM