考虑裂隙面积率的裂隙性黏土优势流双域入渗规律研究  

A Dual-domain Preferential Flow Law of Cracked Clay Considering the Area Ratio of Cracks

作　　者：周峙 罗易 张家铭 孙狂飙[4] ZHOU Zhi;LUO Yi;ZHANG Jiaming;SUN Kuangbiao(Department of Engineering Management,Hubei University of Economics,Wuhan 430205,China;Engineering Research Center of Rock-Soil Drilling&Excavation and Protection 9Ministry of Education,China University of Geosciences(Wuhan),Wuhan 430074,China;Faculty of Engineering,China University of Geosciences(Wuhan,),Wuhan 430074,China;Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China)

机构地区：[1]湖北经济学院工程管理系,湖北武汉430205 [2]中国地质大学(武汉)岩土钻掘与防护教育部工程研究中心,湖北武汉430074 [3]中国地质大学(武汉)工程学院,湖北武汉430074 [4]安徽省交通控股集团有限公司,安徽合肥230088

出　　处：《安全与环境工程》2023年第2期109-118,共10页Safety and Environmental Engineering

基　　金：国家自然科学基金面上项目(42177166);岩土钻掘与防护教育部工程研究中心开放基金项目(202210);湖北省水利重点科研项目(HBSLKY202016);安徽省交控建设管理有限公司科技攻关项目(JKKJ-2020-04);河南省地质矿产开发局地质科研项目(2021Z-20)。

摘　　要：为模拟降雨条件下裂隙性黏土中的雨水入渗过程,基于双孔隙域入渗理论和Green-Ampt入渗模型,引入土体裂隙平面几何参数,提出考虑裂隙面积率的裂隙性黏土优势流双域入渗模型,探究降雨强度、土体裂隙面积率和裂隙域饱和渗透系数对土体基质域与裂隙域积水时间、入渗量和入渗深度的影响,揭示土体干缩开裂后的优势流入渗规律。结果表明:提出的考虑裂隙面积率的裂隙性黏土优势流双域入渗模型形式简单、计算方便、物理意义明确且较好地体现了土体裂隙对雨水入渗过程的影响;降雨强度增大,土体基质域与裂隙域两域积水时间缩短,入渗量和入渗深度增幅较小;土体裂隙面积率增大,土体基质域积水时间不变、裂隙域积水时间延长,且土体基质域与裂隙域的入渗量分别与土体裂隙面积率呈反比和正比;土体裂隙域饱和渗透系数增大对土体基质域入渗的影响较小,仅导致土体裂隙域积水时间延长,入渗量和入渗深度增大;土体裂隙域优势流最终入渗量和入渗深度对降雨强度变化的响应不敏感,主要受土体裂隙面积率和裂隙域饱和渗透系数的控制。In order to simulate rainwater infiltration process in cracked clay under rainfall conditions,a dominant inflow and infiltration model considering the area ratio of soil cracks is proposed based on the two-pore domain infiltration theory and Green-Ampt infiltration model.In this paper,the effects of rainfall iritensity,the area ratio of soil cracks and saturated permeability coefficient in the fissure area on the water-logging time,infiltration amount and infiltration dep th in the soil matrix and fissure area are studied,and the preferential flow law after dry shrinkage cracking is revealed.The results show that the proposed model of dual domain infiltration of preferential flow in soil cracks has simple form,convenient calculation,and clear physical significance,and better reflects the influence of soil cracks on rainwater infiltration process.With the increase of rainfall intensity,the water-logging time in the two areas,i.e.,matrix domain and fracture domain of the soil is shortened.Furthermore,the increase of infiltration amount and infiltration depth is small.When the crack area rate increases,the water-logging time in the soil matrix domain stays the same,while that in the fracture domain increases.Meanwhile,the infiltration amount of the soil matrix domain and the fracture domain is inversely proportional to and directly proportional to the fracture area rates re-spectively.The increase of saturated permeability coefficient in the soil fracture domain does not affect the infiltration process in the soil matrix domain,but only leads to the extension of water-logging time in the soil fracture domain,and the increase o£infiltration volume and depth.The final infiltration amount and infiltration depth of preferential flow in soil fissure are insensitive to the change of rainfall intensity and are mainly controlled by soil fissure area ratio and saturated permeability coefficient.

关 键 词：裂隙性黏土 土体裂隙 裂隙面积率 优势流 基质域与裂隙域 双域入渗模型 

分 类 号：X43[环境科学与工程—灾害防治] TU44[建筑科学—岩土工程]