| 人工冻土围压SHPB试验与冲击压缩特性分析 |
| |
| 引用本文： | 马芹永,张经双,陈文峰,袁璞.人工冻土围压SHPB试验与冲击压缩特性分析[J].岩土力学,2014,35(3):637-640. |
| |
| 作者姓名： | 马芹永 张经双 陈文峰 袁璞 |
| |
| 作者单位： | 安徽理工大学 矿山地下工程教育部工程研究中心,安徽 淮南 232001 |
| |
| 基金项目： | 国家自然科学基金资助（No.50874003） |
| |
| 摘 要： | 利用分离式Hopkinson压杆(SHPB),以铝质套筒作为围压装置,分别研究温度为-8、-12、-16℃在不同应变率下的人工冻结黏土围压状态变形特征和轴向动态应力-应变关系。研究结果表明:在围压状态下,冻土呈黏塑性破坏特征;当人工冻结黏土温度为-16℃、平均应变率分别为410、457、525、650、827 s-1时,其最大应力分别为10.76、12.18、14.27、20.24、23.34 MPa,最大应变分别为0.081 7、0.097 2、0.105 0、0.131 0和0.166 0,表现出较强应变率效应;-12℃和-16℃时在应变率为457 s-1下的最大应力分别为8.28 MPa和12.18 MPa;当应变率相同时,温度越低,最大应力越大,冻结黏土表现出较强的温度相关性。人工冻土的动力学特性为冻土开挖方法的研究提供依据。
|
| 关 键 词： | 人工冻土 冻结黏土 分离式Hopkinson压杆(SHPB) 试验 围压状态 应变率效应 温度效应 |
| 收稿时间： | 2011-08-30 |
Analysis of SHPB test and impact compression in confining pressure for artificial frozen soil |
| |
| MA Qin-yong,ZHANG Jing-shuang,CHEN Wen-feng,YUAN Pu.Analysis of SHPB test and impact compression in confining pressure for artificial frozen soil[J].Rock and Soil Mechanics,2014,35(3):637-640. |
| |
| Authors: | MA Qin-yong ZHANG Jing-shuang CHEN Wen-feng YUAN Pu |
| |
| Institution: | Research Center of Mine Underground Engineering of Ministry of Education, Anhui University of Science and Technology, Huainan, Anhui 232001, China |
| |
| Abstract: | Split Hopkinson pressure bar (SHPB) was adopted to study the deformation behaviors and axial dynamic stress-strain relationship of artificial frozen clay in confining pressure state. Three kinds of artificial frozen clay with frozen temperatures of -8 ℃, -12 ℃ and -16 ℃ were investigated in SHPB test. And aluminum sleeve was chosen as confining pressure device. The results show that viscoplasticity failure is presented when artificial frozen soil in confining pressure state under high strain rate. When average strain rates are 410 s-1, 457 s-1, 525 s-1, 650 s-1 and 827 s-1, the maximum stresses of artificial frozen soil at -16 ℃ are 10.76 MPa, 12.18 MPa, 14.27 MPa, 20.24 MPa and 23.34 MPa respectively; and the maximum strains of artificial frozen soil at -16 ℃ are 0.081 7, 0.097 2, 0.105 0, 0.131 0 and 0.166 0 respectively. Besides, when average strain rate is 457 s-1, the maximum stress of artificial frozen soil at -12 ℃ is 8.28 MPa; and the maximum stress of artificial frozen soil at -16 ℃ is 12.18 MPa. When the strain rate is the same, the lower the frozen temperature, the larger the maximum stress of artificial frozen soil. Strong temperature correlation could be observed from artificial frozen soil in high strain rate. Research on dynamic mechanical behaviors of artificial frozen clay will provide some supports for frozen soil excavation. |
| |
| Keywords: | artificial frozen soil frozen clay split Hopkinson pressure bar (SHPB) test confining pressure strain rate effect temperature effect |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《岩土力学》浏览原始摘要信息 |
| 点击此处可从《岩土力学》下载免费的PDF全文 |
|
