研究目的：重载列车轴重的提高增大了路基不同深度处的动应力,由此引发的翻浆冒泥等病害日益严重。本文开展精细化模型试验,针对重载列车荷载作用下饱和粉质黏土路基的翻浆冒泥特性进行研究,分析循环荷载幅值及加载频率对试样轴向应变、超孔隙水压力及细颗粒迁移特性等性质的影响。
研究结论：（1）循环荷载幅值对粉质黏土路基翻浆冒泥特性具有显著的影响,随着循环荷载幅值的增加,试样产生的轴向应变及超孔隙水压力增大,路基翻浆冒泥程度也不断增加;（2）加载频率对路基翻浆冒泥特性有一定影响,随着加载频率的增加,试样的最终轴向应变及超孔隙水压力均有所减小,试验结束后翻冒的泥浆质量减少;结合试验现象来看,加载频率的增加并不能加剧翻浆冒泥的程度,但能显著缩短翻浆冒泥发生的时间;（3）循环荷载作用下路基内部的超孔隙水压力梯度驱动路基土体细颗粒迁移,从而产生翻浆冒泥病害;（4）本研究成果可为重载铁路路基翻浆冒泥病害的整治提供参考。
Abstract
Research purposes: The increase of heavy-haul train axle load enhances the dynamic stress at different depths of the subgrade, leading to more and more serious subgrade issues such as mud pumping. In this paper, a series of refined model tests were carried out to study the characteristics of mud pumping of saturated silty clay subgrade under the heavy-haul train load. The influence of cyclic loading amplitude and loading frequency on the axial strain, excess pore water pressure, and fine particles migration characteristics of the sample was analyzed.
Research conclusions: (1) The cyclic loading amplitude has a significant impact on the characteristics of mud pumping from silty clay subgrade. As the cyclic loading amplitude increases, axial strain and excess pore water pressure rise, intensifying mud pumping. (2) The loading frequency has a certain influence on the characteristics of subgrade mud pumping. In general, higher loading frequencies decrease the final axial strain and excess pore water pressure, reducing mud pumping quality post-test. The increased frequency can't accelerate the mud pumping severity, but can shorten the duration of mud pumping. (3) Under cyclic loading, the excess pore water pressure gradient drives the migration of fine particles in the subgrade soil, resulting in mud pumping. (4) The research results can provide a reference for the treatment of the mud pumping issues in the heavy-haul train subgrade.
关键词
重载铁路 /
翻浆冒泥 /
轴向应变 /
超孔隙水压力 /
细颗粒迁移 /
超孔隙水压力梯度
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Key words
heavy-haul railway /
mud pumping /
axial strain /
excess pore water pressure /
fine particles migration /
excess pore water pressure gradient
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中图分类号：
TU431
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参考文献
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脚注
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基金
国家自然科学基金（51978674）; 中国国家铁路集团有限公司科技研究开发计划（L2022G002）; 湖南省自然科学基金（2022JJ30737）
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