Abstract
Due to the influence of near-field effect and soil filterability, there are still many disputes for determining the shear wave propagation time, which hinders further development and application of the bending element test. Based on the Stokoe type resonance column instrument (RC), a pair of bending elements (BES) was implanted into the system, which achieved the combined test of RC and BES on a same soil specimen. In order to test the device reliability, combined tests of dry Fujian standard sand with different initial densities under different confining pressure were carried out to measure the dynamic shear modulus. Results show that the improved equipment can give play to both the advantages of RC and BES. For the same specimen, the BES calibration is achieved by RC system, which effectively overcomes the problem of time determination in BES test. When BES excitation frequency satisfies the condition (2<Rd<7), the near-field effect can be weakened effectively. When the initial arrival wave method is used to determine the shear wave propagation time in BES test, the take-off point of the previous peak of the received main wave crest should be taken as the arrival time of the shear wave.
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