| 谭毓清,彭成,田宗坤.石灰改良路基填料的动力特性试验研究[J].南华大学学报(自然科学版),2020,34(1):81~87.[TAN Yuqing,PENG Cheng,TIAN Zongkun.Experimental Study of Dynamic Characteristics of Lime Modified Roadbed Filler[J].Journal of University of South China(Science and Technology),2020,34(1):81~87.] |
| 石灰改良路基填料的动力特性试验研究 |
| Experimental Study of Dynamic Characteristics of Lime Modified Roadbed Filler |
| 投稿时间：2019-10-29 |
| DOI： |
| 中文关键词: 石灰改良土 累积轴向应变 动应力幅值 滞回圈 围压 |
| 英文关键词:lime-improved soil accumulated axial strain dynamic stress amplitude hysteresis loop confining pressure |
| 基金项目:湖南省教育厅项目(16C1380);水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK319008) |
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| 中文摘要: |
| 利用GDS动三轴仪对石灰改良路基填料开展动三轴UU试验,以石灰掺量、围压及动应力幅值为变量,分析了石灰改良土的累积轴向应变及应力应变滞回特性的变化规律。试验结果表明:首级加载下,各土样的轴向变形随循环加载次数增加先增大后趋于稳定,素土变形最大,2 000次振动后累积轴向应变接近6%,各石灰改良土在2 000次振动后累积轴向应变低于2%,其中LC=6%约0.57%;同一石灰掺量下,土体变形随动应力幅值增大而增大,随围压增大而减小;土样的应力应变滞回圈随围压增大越靠近竖轴,面积越大,抵抗变形能力变强,滞回圈随动应力幅值增大距离竖轴越远,抵抗变形能力越弱。 |
| 英文摘要: |
| The dynamic triaxial UU test was carried out on the lime-improved soil by using the GDS dynamic triaxial apparatus,to analyze the variation rules of cumulative axial strain and stress-strain hysteresis characteristics of lime-improved soil by taking lime content,confining pressure and dynamic stress amplitude as variables.The test results show that the axial deformation of each soil sample first increased and then tended to be stable with the increase of cyclic loading times under the first stage of loading,the deformation of prime soil was the largest,with the cumulative axial strain of nearly 6% after 2 000 vibrations,and that of each lime improved soil is less than 2% after 2 000 vibrations,while that of LC=6% is about 0.57%.With the same content of lime,the deformation of soil increases with the increase of dynamic stress amplitude and decreases with the increase of confining pressure.The stress-strain hysteresis cycle of soil samples gets closer to the vertical axis with the increase of confining pressure,and its area is bigger,and the resistance to deformation becomes stronger.The hysteresis cycle gets the further distance from the vertical axis,the weaker the resistance to deformation is. |
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