Abstract
As a frequently-used roadbed filler, soil-rock mixture is often in the environment of freeze-thaw cycles and different confining pressures. In order to study the freeze-thaw damage mechanism of elastic modulus of soil-rock mixtures at different confining pressures, the concept of meso-interfacial freeze-thaw damage coefficient is put forward and the meso-interfacial damage phenomenon of soil-rock mixtures caused by the freeze-thaw cycle environment is concerned; a double-inclusion embedded model for elastic modulus of soil-rock mixtures in freezing-thawing cycle is proposed. A large triaxial test was performed and the influences of confining pressure and experimental factors on elastic modulus of soil-rock mixtures were obtained, and then the accuracy of the double-inclusion embedded model to predict the elastic modulus of soil-rock mixtures in freezing-thawing cycle is verified. Experiment results showed that as to soil-rock mixtures, with the increase of confining pressure, the elastic modulus increases approximately linearly. The most crucial factors to affect the elastic modulus are rock content and compaction degree at the same confining pressure; the elastic modulus increases with the increase of rock content and compactness; as the number of freeze-thaw cycles increases, the freeze-thaw damage coefficient of meso-structural interface and the elastic modulus decrease.
摘要
土石混合体作为路基填料的常用材料,常处于冻融循环和不同围压的环境中。为了研究不同围 压下土石混合体弹性模量的冻融损伤机理,提出了土石混合体细观界面冻融损伤系数的概念,研究了 冻融循环环境对土石混合体的细观界面破坏现象,继而提出了针对冻融损伤下土石混合体弹性模量计 算的双包体嵌入式冻融损伤模型。然后,利用正交试验,围绕不同围压下5 个主要影响因素(含石量、 压实度、冻融次数、含水率、冻结温度)对冻融循环环境下土石混合体静力学特性的影响进行了一系 列大型三轴试验。通过对试验结果的分析,得到围压和试验因素对土石混合体弹性模量的影响规律, 验证了双包体嵌入模型预测冻融循环环境下土石混合体弹性模量的准确性。实验结果表明:随着围压 的增加,土石混合体弹性模量近似线性增加;含石量和压实度是影响土石混合体弹性模量最关键的因 素,含石量和压实度越大,弹性模量越大;随着冻融循环次数的增加,土石混合体细观结构界面冻融 损伤系数和弹性模量减小。
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Foundation item: Project(50908234) supported by the National Natural Science Foundation of China
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Zhou, Z., Liu, Zz., Yang, H. et al. Freeze-thaw damage mechanism of elastic modulus of soil-rock mixtures at different confining pressures. J. Cent. South Univ. 27, 554–565 (2020). https://doi.org/10.1007/s11771-020-4316-z
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DOI: https://doi.org/10.1007/s11771-020-4316-z