Accumulated Deformation of Gravel Filler of Subgrade under Cyclic Loading

被引：0

作者：

Li Y. ^{[1
]}

Zhang J. ^{[1
,2
]}

Zhu Z. ^{[1
,2
]}

Wang X. ^{[1
,2
]}

Yu Z. ^{[1
]}

机构：

[1] School of Civil Eng., Central South Univ., Changsha

[2] National Eng. Lab. for Consiuction Techol. of High Speed Railway, Central South Univ., Changsha

来源：

Gongcheng Kexue Yu Jishu/Advanced Engineering Sciences | 2018年 / 50卷 / 05期

关键词：

Cumulative deformation; Cyclic loading; Graded gravel; Large-scale dynamic triaxial test;

D O I：

10.15961/j.jsuese.201700882

中图分类号：

学科分类号：

摘要：

Under cyclic loading of the train, the cumulative deformation of the subgrade will be produced, which causes the track irregularity and affects the comfort and safety of the train. In this paper, the cumulative deformation of grading macadam filter for railway subgrade under cyclic loading is studied by large dynamic triaxial tests. The tests were carried out to study the effects of cyclic loading time, confining pressure and cyclic stress ratio on accumulated deformation of grading macadam material. Based on the experimental results, a mathematical model that can reflect the development pattern of the cumulative deformation of grading macadam material is proposed. The tests show: 1) With the increase of cyclic stress ratio, the number of cycles required for the cumulative deformation achieves stability increases gradually. When the cyclic stress ratio is constant, the influence of confining pressure on the number of cycles required for stability is not obvious. The larger the confining pressure is, the larger the final cumulative deformation is. 2) Under the same confining pressure, the larger the cyclic stress ratio is, the more number of cycles are needed for stability and the larger the final cumulative deformation of the grading macadam material is. 3) The larger the confining pressure is, the larger the cumulative deformation is. The larger the cycle stress ratio is, the larger the final cumulative deformation is. When the cyclic stress ratio reaches 0.4, the accumulative deformation law is no longer valid for the stable type. The influence of cyclic loading time, confining pressure and cyclic stress ratio on the cumulative deformation of grading macadam material was obtained through experiments. According to the characteristic of stable type's cumulative deformation curve, a mathematical formula for predicting the cumulative deformation of grading macadam material is proposed. The rule of stable type's cumulative deformation of grading macadam filter is revealed. It provides a basis for accurate prediction and control of post-construction settlement of railway subgrade. © 2018, Editorial Department of Advanced Engineering Sciences. All right reserved.

引用

页码：130 / 137

页数：7

共 15 条

[1]

Liu B., Su Q., Pham D.P., Et al., Study of critical dynamic stress and deformation law of graded gravel under different moisture content, Journal of the China Railway Society, 38, 6, pp. 100-107, (2016)

[2]

Xiong Z., Jin L., Cheng J., Et al., Experimental study on improved coarse grain frost heaving characteristics of filling for high speed railway, China Railway Science, 36, 5, pp. 1-6, (2015)

[3]

Wichtmann T., Triantafyllidis T., Stress attractors predicted by a high-cycle accumulation model confirmed by undrained cyclic triaxial tests, Soil Dynamics and Earthquake Engineering, 69, 2, pp. 125-137, (2015)

[4]

Nguyen N., Francois S., Degrande G., Discrete modeling of strain accumulation in granular soils under low amplitude cyclic loading, Computers and Geotechnics, 62, pp. 232-243, (2014)

[5]

Bian X., Jiang J., Jin W., Et al., Cyclic and postcyclic triaxial testing of ballast and subballast, Journal of Materials in Civil Engineering, 28, 7, pp. 1-11, (2016)

[6]

Jiang G., Fang L., Wang Z., Et al., Experimental study on dynamic strength and accumulated deformation characteristics of red-mudstone filling, Chinese Journal of Geotechnical Engineering, 32, 1, pp. 124-129, (2010)

[7]

Monismith C.L., Ogawa N., Freeme C.R., Permanent deformation characteristics of subgrade soils due to repeated loading, Transport Research Record, 537, pp. 1-17, (1975)

[8]

Li D., Selig E.T., Cumulative plastic deformation for fine-grained subgrade soils, Journal of Geotechnical and Geoenvironmental Engineering, 122, 12, pp. 1006-1013, (1996)

[9]

Trinh V.N., Tang A.M., Cui Y., Et al., Mechanical characterisation of the fouled ballast in ancient railway track substructure by large-scale triaxial tests, Soils and Foundations, 52, 3, pp. 511-523, (2012)

[10]

Zang M., Kong L., Cao Y., Improved model for cumulative deformations of clay subjected to cyclic loading, Rock and Soil Mechanics, 38, 2, pp. 1-8, (2017)

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