Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (S1): 387-393.doi: 10.16285/j.rsm.2019.1796

• Testing Technology • Previous Articles     Next Articles

Bending-extension element experiment to obtain elastic parameters of clay under different moisture contents

ZHOU Yue-feng1, 2, YANG Zhe1, 2, RAO Xi-bao1, 2, XIAO Guo-qiang1, 2, ZHOU Li-ming1, 2   

  1. 1.Yangtze River Scientific Research Institute of Changjiang, Water Resources Commission, Wuhan, Hubei 430000, China; 2. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resource, Yangtze River Scientific Research Institute of Changjiang, Wuhan, Hubei 430000, China
  • Received:2019-10-26 Revised:2019-12-25 Online:2020-06-19 Published:2020-06-09
  • Supported by:
    This work was supported by the National Key R&D Program of China(2017YFC1502603) and the National Natural Science Foundation of China(51509018, 51979010).

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Abstract: The wave velocity of low liquid limit clay with different moisture contents is tested using a GDS bending-extension element system. The shear modulus, oedometric modulus and poisson's ratio of clay are measured based on wave theory. The effects of different moisture contents, effective confining pressure and signal input frequency on the test results are studied. The output waveform signals characteristics of S wave (shear wave) and P wave (compression wave) are analyzed. The results of different signal analysis methods are compared with that of the resonance column experimen. The experimental results show that (1) the Vs (shear wave velocity) and Vp (compression wave velocity) increase with the increase of input frequency, and the increase rate decreases with the increasing frequency. The near-field effect of S wave decreases with the increasing moisture content and stimulated frequency in clay materials. (2) the shear modulus G0 and oedometric modulus M0 increase with the increase of confining pressure, while G0 decreases with the increase of moisture content. (3) the Poisson's ratio increases with the increase of moisture contents and the impact of confining pressure on Poisson's ratio weakens with the increase of moisture contents.

Key words: bending-extension element, shear modulus, poisson's ratio, resonance column

CLC Number: 

  • TU 443
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