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Experimental research on dynamic characteristics of Xigeda formation claystone in Xichang

ZHANG Jiaming1,LIU Wenlian2,XU Zemin1,LI Qiankun1(1.Department of Civil Engineering,Kunming University of Science and Technology,Kunming 650500,China; 2.Kunming Prospecting Design Institute of China Nonferrous Metals Industry,Kunming 650051,China)  
Based on a lot of dynamic triaxial tests,some dynamic characteristics,such as the relation between dynamic stress and strain,dynamic elastic modulus,damping ratio and dynamic strength are studied for Xigeda formation claystone in Xichang city under different consolidation stress conditions(σ3c=100、200、400 kPa,kc=1.0、1.5、2.0).It is indicated from test results that: the relation between dynamic stress and strain can be fitted with power function model under certain conditions.Dynamic stress increases with the increase of confining pressure σ3c or consolidation stress ratios kc.The Xigeda formation claystone in Xichan city produces larger strain under anisotropic consolidation stress condition than that under isotropic consolidation stress condition at the same stress condition.Dynamic modulus increases with the increase of confining pressure or consolidation stress ratios;it decreases with the increase of dynamic strain and tends to stability under certain condition.Power correlations between the maximum dynamic elastic modulus Ed0 and σ3c/Pa,kc are obtained and normalized under different consolidation stress conditions.Damping ratio increases with the increase of dynamic strain,but the variety gets smaller with the increase of dynamic strain;the damping ration decreases with the increase of confining pressure or consolidation stress ratios,but it is almost independent of them.Power correlations between(λ/λmax)and(1-Ed/Ed0) are obtained under different consolidation stress conditions.Dynamic shear stress τd increases with the increase of confining pressure σ3c or consolidation stress ratios kc,but it decreases with the increase of vibration number.τd/σm decreases with the increase of confining pressure σ3c,but it increases with the increase of consolidation pressure ratio kc.Dynamic shear stress τd has significant linear relation with mean pressure σm and consolidation stress ratios kc.
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