罗崎峰,唐豪,涂国祥,等. 发育两类夹层堆积体的降雨入渗试验研究[J]. 水利水运工程学报,2023(4):98-106. doi: 10.12170/20220402003
引用本文: 罗崎峰,唐豪,涂国祥,等. 发育两类夹层堆积体的降雨入渗试验研究[J]. 水利水运工程学报,2023(4):98-106. doi: 10.12170/20220402003
(LUO Qifeng, TANG Hao, TU Guoxiang, et al. Experimental study on the rainfall infiltration process in the accumulation with two interlayers[J]. Hydro-Science and Engineering, 2023(4): 98-106. (in Chinese)). doi: 10.12170/20220402003
Citation: (LUO Qifeng, TANG Hao, TU Guoxiang, et al. Experimental study on the rainfall infiltration process in the accumulation with two interlayers[J]. Hydro-Science and Engineering, 2023(4): 98-106. (in Chinese)). doi: 10.12170/20220402003

发育两类夹层堆积体的降雨入渗试验研究

Experimental study on the rainfall infiltration process in the accumulation with two interlayers

  • 摘要: 为研究不同组分夹层对降雨入渗的影响及堆积体内部雨水的运移差异与分布特征,以四川汉源九襄地区深厚堆积体为例,对其内部发育的黏土夹层和碎块石夹层展开现场调查,通过设计两类夹层的两组室内降雨试验,监测堆积体内含水率、基质吸力、孔隙水压和湿润锋的迁移变化,研究两类夹层对降雨在堆积体中入渗过程的影响。结果表明:(1)由于夹层颗粒组分不同,最终导致夹层的渗透性、湿润锋迁移形态、入渗速率及整个堆积体浸透时间等存在显著差异;(2)两组夹层试验中雨水入渗差异显著,碎石组的下渗作用强于侧向扩散,夹层处的下渗速率明显快于两侧,而黏土组的侧向扩散强于下渗,夹层处下渗速度趋近于零,明显小于两侧;(3)黏土组坡脚孔压出现累积性增长,而碎石组孔压消散迅速,且水分主要分布在堆积体更深处,故黏土夹层堆积体整体稳定性低于碎石夹层堆积体。研究结果可为后续降雨对发育软弱夹层边坡稳定性的影响分析提供参考。

     

    Abstract: In order to study the influence of interlayer of different components on rainfall infiltration, the differential movement and distribution characteristics of rainwater in the accumulation body were studied. In this research, a detailed field investigation was carried out on two types of intercalation: clay intercalation and fragmentary stone intercalation developed in the deep deposits in Jiuxiang area of Han Yuan, Sichuan Province. By designing two indoor rainfall experiments of gravel interlayer and clay interlayer to monitor the changes of moisture content, matrix suction, pore water pressure and wetting front in the accumulation, the influence of the two types of interlayers on the infiltration process of rainfall in the accumulation was deeply studied. The results show that: (1) Due to the different particle composition of the interlayer, the permeability, wetting front migration morphology, infiltration rate, and the soaking time of the entire stack are ultimately significantly different. (2) There are significant differences in rainwater infiltration between the two groups of sandwich tests. The infiltration effect of the gravel group is stronger than the lateral diffusion, and the infiltration rate at the interlayer is significantly faster than that on both sides, while the lateral diffusion of the clay group is stronger than the infiltration, and the infiltration rate at the interlayer tends to zero, which is significantly lower than that on both sides. (3) The pore pressure at the foot of the slope in the clay group increases cumulatively, while the pore pressure in the gravel group dissipates rapidly, and the water is mainly distributed in the deeper layers of the accumulation, so the overall stability of the clay interlayer accumulation is lower than that of the gravel interlayer accumulation. The research results can provide a basis for analyzing the influence of subsequent rainfall on the stability of slope with weak interlayer.

     

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