EXPERIMENTAL RESEARCH OF EFFECT OF GRANULE SHAPE ON SHEAR MODULUS AND DAMPING RATIO OF GRAVEL
SUN Tian1，2，CHEN Guoxing1，2，WANG Binghui1，2，LI Xiaojun2，3
(1. Institute of Geotechnical Engineering，Nanjing University of Technology，Nanjing，Jiangsu 210009，China；2. Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province，Nanjing University of Technology，Nanjing，Jiangsu 210009，China；3. Institute of Geophysics，China Earthquake Administration，Beijing 100081，China)
Abstract：The effects of effective confining pressure，consolidation ratio，gravel content and grain breakage on the shear modulus and damping ratio of gravel have been studied. However，only little work focused on the effect of the granule shape. Thus，the dynamic triaxial tests under different confining pressures were performed on the gravel specimens to investigate the effect of the granule shape on the shear modulus and damping ratio using a hollow cylinder apparatus(HCA)，which is developed by GDS Instruments Ltd.，United Kingdom. These specimens were made by two kinds of gravel(i.e.，with angular and round grains) with the same grain composition and relative density 45%. The results indicate that the gravel with the round shape has a higher shear modulus than that with the angular one when the confining pressure is higher than 300 kPa or the shear strain amplitude is greater than 7×10－4. The gravel content(content of grains，whose diameter is bigger than 5 mm) corresponding to the maximum shear modulus is called the critical gravel content P5cr，and the P5cr of the angular sample is higher than that of the round one. Conversely，the damping ratio of the angular sample is greater than that of the round one when the shear strain amplitude is larger than 2×10－4.
孙 田1，2，陈国兴1，2，王炳辉1，2，李小军2，3. 砾石颗粒形状对砂砾土动剪切模量和阻尼比影响的试验研究[J]. 岩石力学与工程学报, 2014, 33(S2): 4211-4218.
SUN Tian1，2，CHEN Guoxing1，2，WANG Binghui1，2，LI Xiaojun2，3. EXPERIMENTAL RESEARCH OF EFFECT OF GRANULE SHAPE ON SHEAR MODULUS AND DAMPING RATIO OF GRAVEL. , 2014, 33(S2): 4211-4218.
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2014, Vol. 33 
