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季冻区路基土的能量损伤演化模型研究
引用本文:吴永煤,安征,李永靖,程耀辉.季冻区路基土的能量损伤演化模型研究[J].路基工程,2022,0(3):57-60.
作者姓名:吴永煤  安征  李永靖  程耀辉
作者单位:1.中交一公局第七工程有限公司,郑州 451450
基金项目:国家自然科学基金资助项目(51974146,52174078)
摘    要:依托辽宁阜新某公路路基土样,进行冻融循环试验及三轴压缩试验,分析不同含水率、围压、冻融次数下的弹性能变化规律;基于能量衰减定律,建立能量损伤演化模型,探索季冻区路基土的损伤规律。结果表明:含水率较高时试件应变与弹性能正相关,弹性能随冻融次数和含水率的增加而平顺,含水率较小时弹性能迅速升高出现峰值,然后逐渐减小最后趋于平稳;在围压加持下,随着应变的增加弹性能整体呈现先增大至峰值点后减小并趋于稳定的变化趋势,曲线相同应变位置的弹性能值随围压的增大而增大;能量损伤演化模型曲线与试验曲线吻合度较高,为季冻区冻土路基灾害防治提供了理论依据。

关 键 词:道路工程    能量损伤    演化模型    季冻区    弹性能
收稿时间:2021-12-12

Study on Energy Damage Evolution Model of Frozen Soil Subgrade in Seasonally Frozen Area
Abstract:Based on the ubgrade soil samples selected from a highway in Fuxin, Liaoning province, the freeze-thaw cycle test and triaxial compression test were carried out, and the variation law of elastic energy of subgrade soil with different moisture content, confining pressure and freeze-thaw times was analyzed. Based on the energy decay law, the energy damage evolution model is established in order to explore the damage law of subgrade soil in seasonal freezing area. The results show that when the moisture content is high, the strain of the specimen is positively correlated with the elastic energy. The elastic energy curve of the specimen is smooth with the increase of freeze-thaw times and moisture content. When the moisture content is small, the curve increases rapidly, and the peak elastic property appears. After the peak value, the curve decreases gradually and finally tends to be stable. Under the confining pressure, with the increase of strain, the elastic energy first increases to the peak point, then decreases and tends to be stable. The elastic energy at the same strain position of the curve increases with the increase of confining pressure. The energy damage evolution model curve is in good agreement with the test curve, and it provices a theoretical basis for the disaster prevention of frozen soil subgrade in seasonal freezing area.
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