地铁循环荷载下粘土污染圆砾的大型动三轴试验及动力特性研究

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摘要为揭示地铁循环荷载作用下受粘土污染圆砾的长期动力特性，利用GDS大型三轴循环试验系统，开展了一系列饱和不排水动三轴试验，分析了不同围压及动应力幅值下粘土污染水平(VCI)对圆砾长期动力特性的影响。试验结果表明：随着VCI的增加，试样的累积塑性应变呈先增后减的趋势，污染粘土由润滑作用转变为填充作用，围压为100 kPa时，界限VCI=30%，围压为200 kPa、300 kPa时，界限VCI=20%；VCI对浅埋地铁隧道(σ3=100 kPa)影响较大，威胁行车安全，而对深埋地铁隧道(σ3=200 kPa、300 kPa)影响较小，地铁运行相对安全；随VCI的增加，试样的弹性应变和动孔压比先增大后减小，而回弹模量则先减小后增大，但三者的变化趋势均随围压的降低及动应力幅值的增大愈发明显。研究成果可为地铁路基结构设计及其工后沉降预估提供参考。

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	马少坤1
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	田发派1
	黄海均1
	张加兵1
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	段智博3
	龚健1
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关键词 ：循环荷载, 圆砾, 粘土污染水平, 动力特性

Abstract：In order to investigate the long-term dynamic properties of clay-fouled round under cyclic subway loading, a series of saturated undrained dynamic triaxial tests were carried out by utilizing the GDS large-scale triaxial cyclic test system. The influence of clay fouling level (VCI) on round gravel's long-term dynamic properties under different confining pressures and dynamic stress amplitudes was analyzed. The experimental results show that with the increase of VCI, the cumulative plastic strain of the specimen shows a tendency of increasing and then decreasing, and the fouled clay changes from lubrication to filling. When the confining pressure is 100 kPa, the cut-off VCI is 30%, and when the confining pressure is 200 kPa and 300 kPa, the cut-off VCI is 20%. VCI has a large impact on shallow buried subway tunnels (σ3= 100 kPa), which threatens the safety of traveling, while it has a small impact on deep buried subway tunnels (σ3= 200 kPa, 300 kPa), which makes the subway operation relatively safe. With the increase of VCI, the elastic strain and dynamic pore-pressure ratio of the specimens first increased and then decreased, while the resilience modulus first decreased and then increased. However, the trends of all three changes become more obvious with the decrease of confining pressure and the increase of dynamic stress amplitude. Generally, the research results can be used as a reference for designing subway roadbed structures and their post-construction settlement predictions.

Key words： cyclic loading round gravel clay fouling level dynamic characteristics

收稿日期: 2023-06-01 出版日期: 2024-04-15

引用本文:

马少坤1,2，田发派1，黄海均1，张加兵1,2，段智博3，龚健1,2. 地铁循环荷载下粘土污染圆砾的大型动三轴试验及动力特性研究[J]. 振动与冲击, 2024, 43(7): 245-254.
MA Shaokun1,2, TIAN Fapai1, HUANG Haijun1, ZHANG Jiabing1,2, DUAN Zhibo3, GONG Jian1,2. Large-scale dynamic triaxial tests and dynamic characteristics of clay contaminated round gravel under subway cyclic load. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(7): 245-254.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I7/245

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