Development and Preliminary Application of Resonant Column-Bending Elements Combined Testing Apparatus

2018 International Conference on Civil and Hydraulic Engineering

土木建筑工程;水利工程

Wang, Mingyuan^1 ; Wang, Yong^2 ; Sun, Miaojun^1 ; Wang, Yanli^3 ; Sun, Jizhu^4

Power China Huadong Engineering Corporation Limited, Hangzhou, Zhejiang

310012, China^1

State Key Laboratory and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science, Wuhan, Hubei

430071, China^2

Key Laboratory of Geotechnical Mechanics and Engineering, Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan, Hubei

430010, China^3

School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, Hubei

430070, China^4

关键词: Development and applications;    Device reliability;    Different confining pressures;    Dynamic shear modulus;    Excitation frequency;    Near field effect;    Testing apparatus;    Time determination;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/189/2/022084/pdf
DOI  :  10.1088/1755-1315/189/2/022084

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

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 (2d