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砂夹层黄土路基水分迁移规律

晏长根 邹群 许昱 万琪 石玉玲 马刚峰

晏长根, 邹群, 许昱, 万琪, 石玉玲, 马刚峰. 砂夹层黄土路基水分迁移规律[J]. 交通运输工程学报, 2016, 16(6): 21-29.
引用本文: 晏长根, 邹群, 许昱, 万琪, 石玉玲, 马刚峰. 砂夹层黄土路基水分迁移规律[J]. 交通运输工程学报, 2016, 16(6): 21-29.
YAN Zhang-gen, ZOU Qun, XU Yu, WAN Qi, SHI Yu-ling, MA Gang-feng. Water migration rule of loess subgrade with sand interlayers[J]. Journal of Traffic and Transportation Engineering, 2016, 16(6): 21-29.
Citation: YAN Zhang-gen, ZOU Qun, XU Yu, WAN Qi, SHI Yu-ling, MA Gang-feng. Water migration rule of loess subgrade with sand interlayers[J]. Journal of Traffic and Transportation Engineering, 2016, 16(6): 21-29.

砂夹层黄土路基水分迁移规律

基金项目: 

国家自然科学基金项目 41272285

中央高校基本科研业务费专项资金项目 2014G2260009

甘肃省交通建设科技项目 2013-03

详细信息
    作者简介:

    晏长根(1975-), 男, 江西萍乡人, 长安大学副教授, 工学博士, 从事公路边坡研究

  • 中图分类号: U416.1

Water migration rule of loess subgrade with sand interlayers

More Information
    Author Bio:

    YAN Chang-gen(1975-), male, associate professor, PhD, +86-29-62630052, yanchanggen@163.com

  • 摘要: 以十天高速公路黄土路基为依托, 基于土水势原理提出了在路基土层放置砂夹层来减小黄土层浸水沉陷的发展, 采用室内模型试验, 在黄土路基中部与底部设置砂夹层, 模拟了路基毛细水上升、顶面渗水与边坡渗水的情况, 分析了路基含水率变化规律及其对路基整体强度和稳定性的影响, 并证实了砂夹层的减水阻渗效应。研究结果表明: 黄土路基模型初期水分迁移很快, 中、后期迁移越来越慢; 底部设置砂夹层的路基模块在地下水位上升32d内的体积含水率为24%~27%, 纯黄土路基模块的中、下部(路基顶面0.5m以下)的体积含水率约为60%, 水分最终的影响深度达到了1.2m;在纯黄土路基模块顶面渗水12d后, 体积含水率均超过了60%, 而在中部设置了砂夹层的路基模块在夹层下15cm处(路基顶面0.8m以下)的体积含水率小于40%, 在25cm处体积含水率小于30%。可见, 在压实黄土路基底部与中部设置砂夹层能够阻隔毛细水的上升和减缓水分下渗, 减小了路基内部含水率, 提高了路基的整体稳定性和强度。

     

  • 图  1  黄土和砂夹层的水分迁移特征曲线

    Figure  1.  Characteristic curves of water migration of loess and sand layer

    图  2  复合结构的土水势

    Figure  2.  Soil-water potential of multiple structure

    图  3  路基中水分的迁移途径

    Figure  3.  Migration pathways of water in subgrade

    图  4  路堤模型

    Figure  4.  Embankment model

    图  5  测管分布

    Figure  5.  Distribution of measuring tubes

    图  6  模块Ⅰ~Ⅲ

    Figure  6.  ModulesⅠ-Ⅲ

    图  7  模块Ⅳ与Ⅴ

    Figure  7.  ModulesⅣandⅤ

    图  8  测孔1含水率曲线

    Figure  8.  Water content curves of measuring hole 1

    图  9  测孔2含水率曲线

    Figure  9.  Water content curves of measuring hole 2

    图  10  测孔3含水率曲线

    Figure  10.  Water content curves of measuring hole 3

    图  11  测孔4含水率曲线

    Figure  11.  Water content curves of measuring hole 4

    图  12  测孔5含水率曲线

    Figure  12.  Water content curves of measuring hole 5

    图  13  测孔6含水率曲线

    Figure  13.  Water content curves of measuring hole 6

    图  14  测孔7含水率曲线

    Figure  14.  Water content curves of measuring hole 7

    图  15  测孔8含水率曲线

    Figure  15.  Water content curves of measuring hole 8

    图  16  测孔9含水率曲线

    Figure  16.  Water content curves of measuring hole 9

    图  17  测孔10含水率曲线

    Figure  17.  Water content curves of measuring hole 10

    图  18  测孔11含水率曲线

    Figure  18.  Water content curves of measuring hole 11

    图  19  测孔12含水率曲线

    Figure  19.  Water content curves of measuring hole 12

    图  20  测孔13含水率曲线

    Figure  20.  Water content curves of measuring hole 13

    图  21  测孔14含水率曲线

    Figure  21.  Water content curves of measuring hole 14

    图  22  测孔15含水率曲线(Z=10cm)

    Figure  22.  Water content curve of measuring hole 15(Z=10cm)

    表  1  黄土参数

    Table  1.   Parameters of loess

    下载: 导出CSV

    表  2  路基各土层的物理指标

    Table  2.   Physical indexes of all soil layers of subgrade

    下载: 导出CSV
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