重载铁路粗粒土填料动力特性及累积变形分析

发布时间：2018-02-13 06:01

本文关键词： 重载铁路粗粒土动强度临界动应力累积应变　出处：《岩土力学》2016年03期 　论文类型：期刊论文

【摘要】：重载铁路路基比普通铁路和高速铁路要承受更大的动力荷载,路基本体的动力变形更加明显。重载铁路路基的核心层绝大部分为粗粒土,为了探讨重载铁路路基粗粒土填料在列车往复荷载作用下的变形和强度特性,开展了一系列大型动三轴试验,探讨了不同动应力幅值、不同围压、不同含水率对粗粒土土样累积变形的影响,分析了不同静强度和围压时动强度的特点,并根据粗粒土土样在不同围压和动应力作用下的变形规律,即增大围压或减小动应力有助于增强土体稳定,提出了基于累积变形发展趋势的路基粗粒土变形稳定界限状态和判别准则,并给出了判别准则参数。研究结果对重载铁路路基的动力变形稳定性评价和基于动力变形控制的路基设计具有参考价值。
[Abstract]:The dynamic deformation of the embankment is more obvious than that of the ordinary railway and high-speed railway. The core layer of the heavy-duty railway subgrade is mostly coarse grained soil. In order to study the deformation and strength characteristics of coarse grained soil filler in heavy duty railway roadbed under the action of train reciprocating load, a series of large-scale dynamic triaxial tests were carried out, and different dynamic stress amplitudes and confining pressures were discussed. The effect of different moisture content on the cumulative deformation of coarse grained soil samples is analyzed. The characteristics of dynamic strength under different static strength and confining pressure are analyzed, and according to the deformation rules of coarse grained soil samples under different confining pressures and dynamic stresses, That is, increasing confining pressure or decreasing dynamic stress is helpful to enhance soil stability. Based on the development trend of cumulative deformation, the limit state and criterion of roadbed coarse grained soil deformation stability are proposed. The research results are valuable for the evaluation of dynamic deformation stability of heavy-duty railway subgrade and the design of roadbed based on dynamic deformation control.
【作者单位】：中南大学土木工程学院;高速铁路建造技术国家工程实验室;
【基金】：国家自然科学基金项目(No.U1361204,No.51408613) 中国神华集团科研专项(No.SHGF-14-55) 中国铁路总公司(原铁道部)重大课题(No.2013G004-A-2)~~
【分类号】：U213.1;TU411.8

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