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Dynamic Tests on the Cement-improved Loess under the Vibratory Load

WANG Jia-ding,PENG Shu-jun,MA Yan,XIE Wan-li (State Key Laboratory of Continental Dynamics,Department of Geology,Northwest University,Xi'an,Shannxi 710069,China)  
In this paper dynamic triaxial tests were performed to explore the order and contribution rate of experiment factors such as depth,cement commingle ratio,compacting factor,water-dipping conditions,and vibration frequency on the dynamic characteristics of cement-improved loess including dynamic deformation,dynamic elastic modulus,and damping ratio.On the basis of the foundation construction of the Datong-Xi'an high-speed railway,a large number of test samples have been obtained that include typical loess profiles of various geomorphic units.The dynamic parameters of cement-improved loess were tested on the GDS advanced dynamic triaxial test system at the State Key Laboratory of Continental Dynamics.The orthogonal test method was applied to optimize testing.The dynamic load was calculated according to the train vibration attenuation rule of various depths.Loess samples of various cement ratios were created through compaction tests.The dynamic characteristics of cement-improved loess such as dynamic deformation,dynamic elastic modulus,and damping ratio were determined from dynamic tests that included lengthy periods and a large number of cycles.The results showed that within the test factor level range,the primary and secondary order of factors that affected the vibrated subsidence were cement ratio water-dipping conditions vibration frequency depth compacting factor.In addition,cement ratio and water-dipping conditions showed significant influence on dynamic deformation.The primary and secondary order of factors that affected the dynamic elastic modulus were depth water-dipping conditions cement ratio vibration frequency compacting factor.In addition,depth and submerged conditions showed significant influence.The primary and secondary order of factors that affected the damping ratio were submerged condition situation cement ratio vibration frequency compacting factor depth.In addition,cement ratio and submerged conditions showed highly significant influence.Therefore,an increase in cement ratio results in a significant improvement in the dynamic characteristics of cement-improved loess;no optimal ratio of cement was noted.
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