气温变化对CCBE防护层输水距离的影响  

Influence of Temperature Change on the Diversion of CCBE Layer

作　　者：龚震 黄月华 周成[1,2] 王林[3] 谭昌明 GONG Zhen;HUANG Yuehua;ZHOU Cheng;WANG Lin;TANC hangming(State Key Laboratory of Hydraulics and Mountain River Engineering of Sichuan University,Chengdu,Sichuan 610065,China;Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam of the Ministry of Water Resources, Nanjing,Jiangsu 210024,China;Shanghai Pudong New Area Investment Consulting Company,Shanghai 200125,China;Sichuan Provincial Transport Department Highway Planning,Survey,Design and Research Institute,Chengdu,Sichuan 610041,China)

机构地区：[1]四川大学水电学院水力学与山区河流开发保护国家重点实验室,四川成都610065 [2]南京水利科学研究院水利部土石坝破坏机理与防控技术重点实验室,江苏南京210024 [3]上海浦东新区投资咨询公司,上海200125 [4]四川省交通运输厅公路规划勘察设计研究院,四川成都610041

出　　处：《水利与建筑工程学报》2019年第1期125-130,142,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51579167);水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK915003)

摘　　要：具有毛细阻滞效果的CCBE(Covers with Capillary Barrier Effects,CCBE)防护层构建了一种简易的蓄排水系统,有利于植物护坡。人们定义CCBE层中粗粒土内的输水距离L_d来描述CCBE防护系统的蓄排水能力。影响坡面CCBE防护结构的蓄排水能力的因素有很多,主要探究气温及其变化对它的影响。数值计算结果发现,日均气温越高,对CCBE防护结构的蓄排水能力的影响就越大,输水距离也越大;日均温差对CCBE防护结构输水距离的影响较复杂,大概在4℃日均温差时,CCBE防护结构的输水距离达到最大。研究成果可以为防坡土开裂的CCBE防护系统的设计提供参考依据。Cover with capillary barrier effects(CCBE) layer composes a simple system of rainfall discharge and storage, which is helpful for vegetated soil slope. The rainfall diversion length L_d along the coarse soil layer was usually defined to account the rainfall discharge and storage capacity of CCBE system, and it is affected by many factors. The influence of temperature and its change on the rainfall discharge and storage capacity of CCBE system by means of the rainfall diversion length L_d. The numerical simulation results show that the higher the daily mean temperature is, the larger the diversion length L_d is;but the effect of the daily temperature change is complicated, and around 4℃ the diversion length L_d is largest. Conclusions from this research can be useful for design and construction of other CCBE system on soil slope.

关 键 词：输水距离 CCBE坡面防护 蓄排水能力 气温变化 地表净辐射量 数值计算 

分 类 号：TU43[建筑科学—岩土工程]