自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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45卷    第9期    总第241期    2014年9月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2014)09-3211-08
基于分层假定入渗模型的边坡安全性分析
张杰1, 2,韩同春1, 2,豆红强1, 2,马世国1, 2

(1. 浙江大学 浙江大学滨海和城市岩土工程研究中心,浙江 杭州,310058;
2. 浙江大学 浙江大学软弱土与环境土工教育部重点实验室,浙江 杭州,310058
)

摘 要: Green-Ampt入渗模型是以湿润锋至入渗面间的土体均达到饱和含水率为基础建立的,忽略非饱和区存在的实际情况,造成Green-Ampt模型计算结果不准确。针对这一情况,基于入渗分层假设,通过建立达西定律和雨水入渗质量守恒方程,推求入渗深度和时间的关系,并将其引入边坡安全系数分析。研究结果表明:入渗深度和时间的关系中,分层假设模型更贴近实测值,总体吻合性较高。同一深度,分层假设模型的入渗率始终高于Green-Ampt模型,但对于同一时刻,两模型入渗率相接近。同时,边坡安全系数中,以Green-Ampt模型计算的边坡安全系数过于保守,分层假设模型比Green-Ampt模型的边坡入渗深度和失稳时间有明显的延缓。正确分析土体内部入渗情况,将有助于准确预报边坡滑坡失稳,减小边坡加固,以免造成经济浪费。

 

关键字: 分层假设;入渗;边坡;延缓

Analysis slope safety based on infiltration model based on stratified assumption
ZHANG Jie1, 2, HAN Tongchun1, 2, DOU Hongqiang1, 2, MA Shiguo1, 2

1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
2. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education,
Zhejiang University, Hangzhou 310058, China

Abstract:Green-Ampt infiltration model is set up based on saturation moisture content which is from wetting front to the infiltration surface, regardless of the unsaturated zone at actual situation, which makes Green-Ampt model calculation results inaccurate. In view of this situation, based on infiltration stratified hypothesis, ascertains the relationship between the infiltration depth and time was ascertained through establishing Darcy’s law and rainfall infiltration mass conservation equation, and was introduced into the slope safety factor analysis. The result shows that stratified hypothesis model is closer to the measured value and has a higher total anastomosis between the infiltration depth and time relationship. For same infiltration depth, stratified hypothesis model of infiltration rate is always higher than Green-Ampt model’s, but at the same infiltration time, two model infiltration rates are close. At the same time, the calculation of slope safety factor of the Green-Ampt model is too conservative, and the slope infiltration depth and instability time of stratified hypothesis model is obviously behind Green-Ampt model. The correct analysis of the internal soil infiltration will help us to accurately forecast the landslide slope instability, so as to reduce unnecessary slope reinforcement to cause economic waste.

 

Key words: stratified hypothesis; infiltration; slope; time delay

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