自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
自然科学版 英文版
英文版编委
自然科学版 英文版
英文版首届青年编委

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第49卷    第4期    总第284期    2018年4月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2018)04-0971-08
降雨条件下粗粒土高路堤边坡暂态饱和区形成条件及影响因素
段旭龙1,何忠明2,刘登生2,杨煜2

(1. 中南大学 地球科学与信息物理学院,湖南 长沙,410083; 2. 长沙理工大学 交通运输工程学院,湖南 长沙,410114)

摘 要: 为了分析降雨条件下暂态饱和区形成条件和影响因素,首先建立粗粒土高路堤边坡一维数值计算模型,探讨粗粒土高路堤边坡暂态饱和区的形成条件;通过建立二维数值计算模型,分析降雨强度、降雨时间、渗透系数以及初始表面基质吸力等因素对暂态饱和区形成的影响。研究结果表明:暂态饱和区的形成过程受降雨时间以及降雨强度共同控制,当雨水在边坡表层的入渗流速大于其土体内部出渗流速时,土体体积含水率升高,边坡出现暂态饱和区;在降雨过程中,边坡表层土体中水的流速最终达到与降雨强度基本一致(流速与降雨强度量纲相同),边坡表层土体的体积含水率与降雨强度有关;在降雨过程中,粗粒土高边坡坡脚位置的体积含水率增大最快,该处暂态饱和区出现时间最早,范围最广;降雨强度、初始表面基质吸力对暂态饱和区的形成时间以及深度影响较大,渗透系数的影响较小;在降雨强度相同时,初始表面基质吸力越大,雨水入渗的深度越大,暂态饱和区的范围越广。

 

关键词: 降雨入渗;粗粒土高边坡;暂态饱和区;数值计算;基质吸力

Formation conditions and influencing factors of transient saturated zone of high slope with coarse-grained soils under rainfall condition
DUAN Xulong1, HE Zhongming2, LIU Dengsheng2, YANG Yu2

1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China; 2. School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China

Abstract:In order to research the formation conditions of transient saturated zone, the 1-D numerical high embankment slope with coarse soil calculation mode was founded. The 2-D numerical calculation mode was founded, which was used to discuss the influence of rainfall intensity, rainfall time, the matrix suction of initial surface and slope ration and other factors on the formation of transient saturated zone. The results show that the formation processes of transient saturated zone are controlled by rainfall intensity and rainfall time, and the appearance reason for transient saturated zone is that the infiltration rate of the slope surface is larger than seepage rate in the soil. During the process of rainfall, the velocity of water in the slope surface soil is consistent with the rainfall intensity, and the volumetric water content of the slope surface soil is related to the rainfall intensity. During rainfall process, the increased velocity of the volumetric water content of high slope with coarse-grained soils toe is the fastest, and so the time that the transuent saturated zone appears is the earliest, and the range is the widest. Rainfall intensity, rainfall time and the matrix suction of initial surface have certain effects on the formation time and depth of transuent saturated zone, and their influence degree is greater than the effect of permeability coefficient on the formation time of saturation zone relatively. Under the same rainfall intensity conditions, the larger the matrix suction of initial surface, the greater the depth of rainwater infiltration and the wider the range of the transient saturated zone.

 

Key words: rain-fall infiltration; high slope with coarse-grained soils; transient saturated zone; numerical calculation; matrix suction

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号