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为探究地铁列车振动荷载作用下砂土液化可能性问题，通过室内动三轴试验，深入研究了地铁列车振动荷载对砂土液化宏观响应特性的影响。研究结果表明，动应力幅值、加载频率以及有效围压等因素均对液化特性产生显著影响。具体而言，随着动应力幅值的增大或加载频率的降低，液化破坏所需的振动次数减少，液化风险相应增加；而有效围压的增大会有效提高砂土的抗液化能力。在不同影响因素的作用下，所产生的轴向应变也呈现出不同的特点，动应力幅值的增大和加载频率的降低会导致液化破坏后的轴向应变减小，而有效围压的增大则能有效减小产生的轴向应变。
Abstract：To explore the possibility of sand liquefaction under the action of subway train vibration loads,this study conducted indoor dynamic triaxial tests to investigate the influence of subway train vibration loads on the macroscopic response characteristics of sand liquefaction.The research results indicate that factors such as dynamic stress amplitude,loading frequency and effective confining pressure all have significant effects on liquefaction characteristics.Specifically,with the increase of dynamic stress amplitude or the decrease of loading frequency,the number of vibrations required for liquefaction damage decreases,and the liquefaction risk increases accordingly.Increasing the effective confining pressure can effectively enhance the anti-liquefaction ability of sand.Under the influence of different factors,the axial strains generated exhibit different characteristics.An increase in dynamic stress amplitude and a decrease in loading frequency can lead to a reduction in axial strain after liquefaction damage,while an increase in effective confining pressure can effectively reduce the generated axial strain.
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基本信息:
中图分类号:U231;U211.3;TU435
引用信息:
[1]徐传龙,张瑾,张翔瑜,等.地铁列车振动荷载作用下砂土液化特性试验研究[J].青岛理工大学学报,2025,46(06):47-54+89.
基金信息:
山东省自然科学基金（ZR2021MD005）; 海洋环境混凝土技术教育部工程研究中心面上项目（TMduracon2022002）
2024-04-01
2024
2025-10-13
2025
2
2025-12-30
2025-12-30