冲击压缩荷载下压实粘性土的动态力学性能试验研究  

Experimental study on dynamic mechanical properties of compacted clay under impact compressive loading

作　　者：刘俊新[1,2] 陈忠富[2] 陈刚[2] 徐伟芳[2] 

机构地区：[1]西南科技大学土木与建筑学院,四川绵阳621010 [2]中国工程物理研究院总体工程研究所,四川绵阳621900

出　　处：《浙江工业大学学报》2013年第3期304-308,共5页Journal of Zhejiang University of Technology

基　　金：国防973基金资助项目(61392);国家自然科学基金资助项目(11076023)

摘　　要：针对压实粘性土体应变率敏感性,利用聚碳酸脂分离式Hopkinson压杆试验装置,对其动态力学性能进行了研究.结果表明:压实粘性土的动态强度、峰值强度增长因子和比能量吸收以及过应力与应变率呈近似指数关系,而动态峰值应变与峰值应变增长因子随应变率的增加而近似线性增加,这些均说明动态峰值强度和峰值应变均体现了显著的应变率相关性.同时进一步分析过应力与应变率(包括准静态)的关系表明:当应变率低于参考应变率时,动态强度受应变率的影响相对较小,而当应变率高于参考应变率时,动态强度受应变率的影响较大.In order to investigate compressive mechanical properties with strain rates on compacted clays,the specimens were subjected to axial impact with different projectile speeds by using the split Hopkinson pressure bar made by polycarbonate. Experimental results show that the parameters related to peak stress and strain are dependent on the strain rate, and the effects of the strain rate can be expressed by exponential approximations, namely peak stress, dynamic strength increase factor, specific energy absorption and overstress, however the parameters related to strain, namely strain and peak strain increase factor, can be expressed by linear approximations. At the same time, further analysis of the relationship between overstress and strain rate （including the quasi-static） show that when the strain rate is lower than the reference strain rate, the dependence of the dynamic strength on the strain rate is relatively small, and when higher than the reference strain rate, the dynamic strength is significantly influenced by the strain rate.

关 键 词：聚碳酸脂 压实粘性土 波形整形技术 应变率 冲击力学性能 

分 类 号：TU411.8[建筑科学—岩土工程]