Abstract
The resilient modulus and Poisson's ratio of subgrade soils in highway foundation are important parameters in design and quality control process. The currently used techniques include California Bearing Ratio (CBR) test, resilient modulus test, Dynamic Cone Penetrometer (DCP), and Falling Weight Deflectometer (FWD) tests. However, these techniques have certain limitations and sometimes fail to satisfy the requirement and accuracy for design purposes. In recent years, piezoelectric sensors have been widely used for laboratory measurement of wave velocities in soil and rock specimens. For shear wave velocity determination, bender elements have been applied to the tests. On the other hand, extender elements have been used for the measurement of primary wave velocity. This new laboratory testing technique is adopted to measure the two important parameters, the resilient modulus and Poisson's ratio of subgrade soils in laboratory tests. The results of using this technique on a soil sample is presented and compared with that obtained from CBR tests. It is concluded that this new technique is simple, accurate and has potential to be widely used in engineering practice.
Original language | English |
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Pages (from-to) | 45-53 |
Number of pages | 9 |
Journal | Geotechnical Special Publication |
Issue number | 232 GSP |
DOIs | |
State | Published - 2013 |
Event | 2nd International Conference on Geotechnical and Earthquake Engineering: Challenges and Recent Advances in Geotechnical and Seismic Research and Practices, IACGE 2013 - Chengdu, China Duration: 25 Oct 2013 → 27 Oct 2013 |