摘要
为了探究坡度对膨胀土边坡径渗流特性的影响规律,开展了膨胀土边坡的人工降雨模型试验,对不同坡度边坡的径渗流分配特性及土体含水量随时间的变化特征进行分析。结果表明:①在相同的降雨条件下,坡度小的边坡,地表径流出现的时间越晚,雨水在边坡上以入渗为主、地表径流为辅的现象越明显;②随着坡度的增加,地表径流在降雨中的比例增大,边坡同一深度土体含水量在相同降雨时间下的增量越小,坡度对产流时间、径渗流分配特性、边坡土体含水量的影响不断减弱;③随着降雨入渗时间的增加,边坡不同深度的土体含水量变化在时间上呈现出一定的滞后性现象。
Artificial rainfall model test of expansive soil slope was carried out to study the influence of gradient on radial seepage characteristics of expansive soil slope.The time-effect relationship of gradient on the distribution of radial seepage and soil water content in rainfall was analyzed.The experimental results show that in the same rainfall,the start time of runoff was lingering,runoff was auxiliary and seepage was main with the smaller gradient.With the increase of gradient,the proportion of runoff in the total amount of rainfall increases and the increment of soil water content was smaller at the same depth and time.The influence of gradient on the start time of runoff,the characteristics of radial seepage distribution and soil water content of slope were gradually weakened.With the increase of rainfall infiltration time,the water content of slope soil at different depth presents a certain lag in time.
作者
董宏源
雷文凯
梅国雄
徐美娟
赵艳林
DONG Hong-yuan;LEI Wen-kai;MEI Guo-xiong;XU Mei-juan;ZHAO Yan-lin(College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Nanning 530004, China;Key Laboratory of Disaster Prevention and Engineering Safety of Guangxi, Nanning 530004, China)
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2021年第1期1-8,共8页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(41672296,51578164,51878185)
国家留学基金资助项目(201906660001)
广西自然科学基金资助项目(2016GXNSFGA380008)
广西研究生教育创新计划项目(YCSW2019046)。
关键词
膨胀土边坡
模型试验
降雨入渗
径渗流
坡度
含水量
expansive soil slope
model test
rainfall infiltration
runoff seepage
gradient
water content
