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《Journal of Earthquake Engineering and Engineering Vibration》 2013-01
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Effects of initial angles of principal stresses on dynamic deformation properties of loess

WANG Zhijie1,2,LUO Yasheng1(1.College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China; 2.Institute of Geotechnical Engineering,RWTH Aachen University,Aachen 52074,Germany)  
The principal stress orientations of the soil mass of the foundations under buildings and structures are always rotated.Therefore,conducting research on the effects of initial angles of principal stresses on loess dynamic deformation properties is practically significant.Dynamic torsional shear triaxial tests were carried out on undisturbed and remodeled loess under different initial stress states.Influencing laws of initial angles of principal stresses on loess dynamic deformation properties were investigated.Results showed that capacities of resisting shear deformations of undisturbed loess are higher than that of remodeled loess under different initial angles of principal stresses.Under the same other conditions,the bigger the initial angles of principal stresses,the weaker the capacities for resisting shear deformations are.The changing laws of dynamic shear moduli of loess versus dynamic shear strains show a decreasing trend with increasing initial angles of principal stresses;while the changing laws of damping ratios show an increasing trend.Initial dynamic shear moduli and maximum dynamic shear stresses decrease with increasing initial angles of principal stresses.Therefore,the effects of initial angles of principal stresses on loess dynamic deformation properties should be taken into consideration under the condition of large initial average principal stresses.The test results could be used as a reference for project designs in loess areas.
【Fund】: 国家自然科学基金项目(50578134);; 教育部新世纪优秀人才支持计划项目(NECT-06-0864)
【CateGory Index】: TU444
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