循环荷载作用下饱和压实黄土动力特性研究

张军; 郑俊杰; 曹文昭; 赖汉江

循环荷载作用下饱和压实黄土动力特性研究 English Version

1. 山西省交通科学研究院黄土地区公路建设与养护技术交通行业重点实验室，山西太原 030006；2. 华中科技大学岩土与地下工程研究所，湖北武汉 430074

基金项目: 山西省交通建设科技项目（10-2-05）

详细信息

作者简介:
张军(1986- )，男，湖北鄂州人，博士，工程师，主要从事路基工程及特殊土地基处理方面研究。E-mail: zhangjun_hust@qq.com。

中图分类号: TU441
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出版历程
- 收稿日期: 2013-02-27
- 发布日期: 2013-07-18

Dynamic characteristics of saturated compacted loess under cyclic loads

1. Key Lab of Highway Construction & Maintenance Technology in Loess Region, Shanxi Transportation Research Institute, Taiyuan 030006, China; 2. Institute of Geotechnical and Underground Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

摘要

摘要: 通过一系列饱和击实黄土的动三轴试验，分析了循环荷载作用下饱和压实黄土超孔隙水压力、轴向应变、有效应力路径和滞回圈的变化规律，以及不同激振振幅和干密度状态下对饱和压实黄土动力特性的影响。试验结果表明：试验加载初始阶段，超孔隙水压力和轴向变形快速增长，随着循环次数的增加，超孔隙水压力和轴向变形增速逐渐减缓。超孔隙水压力和轴向变形的变化曲线都存在一拐点，当循环次数超过该拐点后，超孔隙水压力和轴向变形趋于稳定。随着循环次数的增加，有效应力路径向左发展，且移动幅度逐渐减缓。当循环次数增加至一定值时，有效应力路径在加载阶段和卸载阶段基本重合。随着循环次数的增加，滞回圈向右发展。随着激振振幅的增大，超孔隙水压力和轴向应变逐渐增大，随着干密度的增大，超孔隙水压力和轴向应变逐渐减小。
- 饱和压实黄土 /
- 动力特性 /
- 循环荷载 /
- 动三轴试验 /
- 轴向应变 /
- 超孔隙水压力
Abstract: Based on a series of dynamic triaxial tests on saturated compacted loess, the relationships among the excess pore water pressures, axial strains, effective stress paths, hysteresis loops and number of loading cycles are studied. Then, the effects of dynamic characteristics under different excitation amplitudes and dry densities are investigated. The results show that the excess pore water pressures and axial strains increase significantly at the beginning of triaxial tests. However, the effects of loading cycles on the excess pore water pressures and axial strains decrease gradually with the increase of loading cycles and become negligible when the loading cycles exceed a certain value. The effective stress paths move to left gradually with the increase of loading cycles, but the degrees of movement decrease gradually. The effective stress paths at the loading phase are essentially coincident with those at the unloading phase when the load cycles exceed a certain value. The hysteresis loops move to right gradually with the increase of loading cycles. With the increase of excitation amplitude, the excess pore water pressures and axial strains increase gradually. With the increase of dry density, the excess pore water pressures and axial strains decrease gradually.
- saturated compacted loess /
- dynamic characteristic /
- cyclic load /
- dynamic triaxial test /
- axial strain /
- excess pore water pressure

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