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| Bidirectional dynamic modulus and damping ratio of silt sand under compression and torsion coupling actions |
| YANG Liguo1，2，SHAO Shengjun1，3 |
| (1. Institute of Geotechnical Engineering，Xi¢an University of Technology，Xi¢an，Shaanxi 710048，China；2. Yellow River Conservancy Technical Institute，Kaifeng，Henan 475003，China；3. Shanxi Key Laboratory of Loess Mechanics and Engineering，Xi¢an University of Technology，Xi¢an，Shaanxi 710048，China) |
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Abstract In order to study the effect of the vibration frequency and the phase difference on the two-way dynamic modulus and the damping ratio of silt sand，a series of tests under the action of compression and torsion coupling were conducted using the hollow cylindrical torsion shear apparatus. The results show that，under the coupling action of two-way dynamic loads，the vibration frequency and the phase difference have certain effects on the axial dynamic stress-strain relationship and the torsional shear stress-strain relationship while no effect on the dynamic shear modulus of silt sand. The initial dynamic shear modulus with the phase difference = 90° is the largest. The vibration frequency and the phase difference have a certain effect on the dynamic compression modulus of silt sand. The dynamic compression modulus at the same dynamic strain increases firstly and then decreases with increasing the vibration frequency. The dynamic compression modulus is respectively the largest and the smallest when he phase difference = 0° and = 90°. The vibration frequency has no effect on the dynamic shear damping ratio and the dynamic compression damping ratio of silt sand，but the phase difference has a significant effect on them. When the same shear strain is reached，the dynamic shear damping ratios when = 0° and = 180° basically coincide with each other and are significantly higher than the dynamic shear damping ratio as = 90°. The dynamic compression damping ratio at a phase difference = 90° increases faster after the dynamic strain reaches 0.1%，significantly greater than the damping ratio of other phase differences.
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2020, Vol. 39 
