主动围压作用下水泥粉质黏土SHPB试验与分析

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摘要为研究围压状态下水泥粉质黏土的冲击压缩特性，进行了不同围压和不同应变率条件下水泥粉质黏土的霍普金森压杆（SHPB）试验，分析了围压和应变率对水泥粉质黏土动态应力-应变曲线、冲击压缩强度以及破坏形态的影响。试验结果表明：围压和单轴状态下的水泥粉质黏土动态应力-应变曲线均经历弹性变形阶段、塑性变形阶段和破坏阶段，但是两种状态下水泥粉质黏土试样的破坏形态不同，单轴条件下水泥粉质黏土试样的破坏程度随应变率增加而逐渐变大，围压作用下水泥粉质黏土在冲击试验后保持较好的整体性。围压和应变率共同影响水泥粉质黏土的冲击压缩强度：相同应变率条件下，水泥粉质黏土冲击压缩强度随围压的增加而增大；相同围压条件下，水泥粉质黏土峰值应力和峰值应变均随应变率的增加而增大，表现出明显的应变率效应。

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	高常辉1
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关键词 ：水泥粉质黏土, 主动围压, SHPB试验, 冲击压缩强度, 应变率效应

Abstract：To study the dynamic compression characteristics of cemented silty clay under confining pressure conditions, a series of split Hopkinson pressure bar (SHPB) tests were carried out under different confining pressures and strain rates. The effects of confining pressure and strain rate on the dynamic stressstrain curve, dynamic compression strength and failure mode of cemented silty clay were analyzed. The results show that the dynamic stressstrain curve of cemented silty clay includes three stages, namely, the elastic deformation, plastic deformation and failure stages. However, the failure modes of cemented silty clay are different in different stress states. Under uniaxial compression condition, the failure degree of cemented silty clay becomes serious gradually with the increase of strain rate, yet it shows a better integrity under confining pressure condition. Both the confining pressure and strain rate have an effect on the dynamic compression strength of cemented silty clay. At the same strain rate, the dynamic compression strength of cemented silty clay increases with the increase of confining pressure. Under the same confining pressure, the peak stress and peak strain of cemented silty clay increase with the strain rate increasing, which shows an obvious strain rate effect.

Key words： cemented silty clay confining pressure SHPB test dynamic compression strength strain rate effect

收稿日期: 2017-03-21 出版日期: 2018-07-15

引用本文:

高常辉1,马芹永1,2，马冬冬1. 主动围压作用下水泥粉质黏土SHPB试验与分析[J]. 振动与冲击, 2018, 37(14): 162-167.
GAO Chang-hui1,MA Qin-yong1,2,MA Dong-dong1 . SHPB test and analysis of cemented silty clay under confining pressure conditions. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(14): 162-167.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2018/V37/I14/162

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