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《Chinese Journal of High Pressure Physics》 2011-05
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Dynamic Mechanical Behaviors of Soil under Impact Loads

ZHU Zhi-Wu1,2,NING Jian-Guo3,LIU Xu1 (1.School of Mechanics and Engineering,Southwest Jiaotong University,Chengdu 610031,China;2.State Key Laboratory of Frozen Soil Engineering,Lanzhou 730000,China;3.State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)  
The test of the impact characteristic of soil is made on split Hopkinson pressure bar at various strain-rates.The dynamic mechanics properties and the strain-rate effect of soil are discussed.Based on the characteristics of measured dynamic stress-strain curves,as well as preparatory simulation,a new viscoelastic damage model has been introduced.A linear spring is put to parallel to two Maxwell units with different relaxing time to express distinct plastic flow.In the constitutive model,one Maxwell unit with low relaxing time is used to describe the low strain-rate response of soil;and the other one with high relaxing time is used to describe the high strain-rate response of soil.Simulated stress-strain curves using the model is of good consistency with measured curves,and the simulated parameters indicate that the response of the low strain-rate of soil is just the same as that of concrete.Howevwe,the response of the high strain-rate of soil is much more violent than that of concrete.
【Fund】: 国家自然科学基金(11172251);; 冻土工程国家重点实验室开放基金(SKLFSE201001);; 中央高校基本科研业务费专项资金资助项目(SWJTU09CX069)
【CateGory Index】: O347.3
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