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《Chinese Journal of Geophysics》 2011-04
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A study of the influence of stress relaxation on the elastic properties of granular materials and the calibration of effective media model

DENG Ji-Xin~(1,2),De-hua Han~3,WANG Shang-Xu~4 1 State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Chengdu University of Technology,Chengdu 610059,China 2 Department of Geophysics and Exploration,College of Geophysics,Chengdu University of Technology,Chengdu 610059,China 3 Rock Physics Lab of Geoscience Department,University of Houston,Houston 77036,USA 4 CNPC Key Laboratory of Geophysical Prospecting,China University of Petroleum,Beijing 102249,China  
In seismic exploration,the effective medium theories based on Hertz-Mindlin contact model were often used to predict the seismic elastic properties of unconsolidated sands.But those theories often give larger shear modulus comparing to measured data.By using 3D discrete element simulation,a series of uniaxial compression and pure shear test were carried out on granular material with the aim to study the insufficiencies of those effective medium theories from the level of microscale of particle size and mesoscale of force chain.The simulation indicates that stress relaxation resulting from the rotation and rearrangements of particles has negligible influences on the calculation of bulk modulus.But the stress relaxation has significant influences on the calculation of shear modulus under the shear stress perturbation.Shear stiffness calibration factor(C) and combined parameter R/R were advocated to calibrate those effective medium theories based on Hertz-Mindlin contact model to accounting for the influence of relaxation in contact area and grain angularity.
【Fund】: 国家重点基础研究发展计划(973)项目(2007CB209600);; 国家自然科学基金项目(40804025)资助
【CateGory Index】: P631.4;P618.13
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