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宽级配砾石土中降雨入渗的优先流模型
Alternative TitlePreferential Flow Infiltration Model for Wide Grading Soils Subject to Rainfall Infiltration
苏立君1,2,3,4; 刘超1,2,4,5; 余方威1,2; 张崇磊1,2; 徐兴倩6
Corresponding Author刘超
2017
Source Publication工程科学与技术
ISSN2096-3246
Volume49Issue:3Pages:37-43
Other Abstract

宽级配砾石土的级配较宽,孔隙尺度跨越几个数量级,降雨入渗易形成空间上的不均匀入渗,即优先流入渗。基于孔隙结构的分形特征,定量研究降雨在宽级配砾石土中的入渗规律。根据多孔介质分形理论及HagenPoiseulle方程,水在不同尺度的孔隙管道内入渗率的量级不同,将土体的孔隙部分划分为2个区域—基质区和优先流区,这2个区域所占的比例随雨强的变化而变化。基质区内各孔隙管道的入渗率均达到其最大的入渗率,但各不相同,孔隙管道的直径量级小,入渗率量级小,优先流区各孔隙管道的入渗率相同且均未达到其最大入渗率,孔隙管道直径量级大,入渗率的量级远大于基质区,据此特征从理论上推导了降雨在土体不同孔隙区域内的入渗量和入渗率的表达式;基于此研究了基质区和优先流区的面积在孔隙中所占比例随雨强的变化特征及相应入渗量和入渗率的变化特征。结果表明:降雨在土体中的入渗呈现出优先流区高速入渗,基质区入渗相对缓慢的特点;随着雨强的增大,优先流区域的入渗率也随之增大。降雨入渗优先流现象产生的根本原因是土体多尺度的孔隙结构和无压力的自由入渗边界2个因素,其大小和分布受到土的饱和渗透系数和降雨强度的影响。从孔隙结构的角度解释了降雨入渗优先流的产生机制。

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Pore diameters of wide grading soil are across several orders of magnitude.A preference flow which is a kind of unbalanced infiltration in space usually appears under rainfall infiltration condition.Based on the fractal structure of pores,quantitative demonstration of rainfall infiltration mechanism in wide grading soil was analyzed.According to the theory of fractal porous media and Hagen-Poiseulle equation,the orders of infiltration rate in different pore pipes were different.On this basis,soil pores were divided two regionsa matrix region and a preferential flow region. Their area ratio changed with rainfall intensity.In the matrix region,the infiltration rates of pore pipes were different and all of them reached their own maximum.However,in the preferential flow region,the infiltration rates of pore pipes were the same and they didnt reach their own maximum.The matrix region was composed of small diameter pore pipes and the preference flow region was composed of large diameter pore pipes.The magnitude of infiltration rate in the matrix region was far less than that in the preferential flow region.The expressions of infiltration amount and infiltration rate were developed in two regions.Infiltration features in different rainfall intensities and the relationship between area ratio and rainfall intensity were studied.The results showed that infiltration rate in the preferential flow region was much higher and it increased with the increase of rainfall intensity.The preferential flow phenomenon was produced by the multi-scale pore structure and free infiltration boundary without surface pond pressure.The value and distribution of infiltration rate were influenced by saturated permeability coefficient of soil and the rainfall intensity.The mechanism of a preferential flow was explained from the pores structure perspective.

 

Keyword宽级配砾石土 分形 多尺度 优先流 降雨入渗
Subject AreaP642.1
DOI10.15961/j.jsuese.201600530
Indexed ByEI ; CSCD ; 北大中文核心
Language中文
CSCD IDCSCD:6000956
Funding Organization国家重点基础研究发展计划资助项目(2013CB733201) ; 中科院重点部署项目资助(KZZD-EW-05-01) ; 中科院百人计划资助项目(苏立君) ; 国家自然科学基金资助项目(51278397)
Accession numberAccession number: 20172603839205
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/19019
Collection山地灾害与地表过程重点实验室
Affiliation1.中国科学院山地灾害与地表过程重点实验室
2.中国科学院水利部成都山地灾害与环境研究所
3.中国科学院青藏高原地球科学卓越创新中心
4.中国科学院大学
5.河北地质大学勘查技术与工程学院
6.云南农业大学水利学院
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
苏立君,刘超,余方威,等. 宽级配砾石土中降雨入渗的优先流模型[J]. 工程科学与技术,2017,49(3):37-43.
APA 苏立君,刘超,余方威,张崇磊,&徐兴倩.(2017).宽级配砾石土中降雨入渗的优先流模型.工程科学与技术,49(3),37-43.
MLA 苏立君,et al."宽级配砾石土中降雨入渗的优先流模型".工程科学与技术 49.3(2017):37-43.
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