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两类夹层对堆积体降雨入渗过程差异试验研究
罗崎峰, 唐豪, 涂国祥, 张鑫, 邱潇
成都理工大学
摘要:
本文以四川汉源九襄地区深厚堆积体为例,对其内部发育的两类夹层:黏土夹层和碎块石夹层展开了详细的现场调查,采用室内物理模型试验,设计碎石夹层和黏土夹层两组物理试验,监测在人工降雨下,堆积体中含水率、基质吸力、孔隙水压和湿润锋的迁移变化,深入研究了两类夹层对降雨在堆积体中入渗过程的影响。得到以下结论:(1)由于夹层颗粒组分不同,最终导致试验结果也不同:夹层的渗透性,湿润锋迁移形态,入渗速率以及整个堆积体浸透时间等存在显著差异。(2)降雨在两组堆积体夹层处入渗差异显著,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旁,而黏土组的侧向扩散强于下渗,夹层处下渗接近于零,两侧速度明显大于中部。(3)发育黏土夹层堆积体出现局部孔压累增的情况,坡脚孔压过高,而碎石夹层堆积体能够提供优先入渗路径,孔压消散迅速,故黏土组堆积体整体稳定性不如碎石组。
关键词:  降雨入渗  碎石夹层  黏土夹层  堆积体
DOI:
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基金项目:国家自然科学基金资助项目(41472274)
Experimental study on the difference of rainfall infiltration process between two types of interlayers
LUO Qi feng, TANG Hao, TU Guo xiang, ZHANG Xin, QIU Xiao
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology
Abstract:
In this paper, taking the deep deposits in Jiuxiang area of Hanyuan, Sichuan as an example, a detailed field investigation is carried out on the two types of interlayers developed in it: clay interlayers and crushed stone interlayers.The indoor physical model test was used to design two groups of physical tests of gravel interlayer and clay interlayer to monitor the migration changes of water content, matrix suction, pore water pressure and wetting front in the accumulation under artificial rainfall. The effect of rainfall infiltration process in the accumulation.The following conclusions are obtained: (1) Due to the different components of the sandwich particles, the final test results are also different: there are significant differences in the permeability of the dissection, the migration morphology of the wetting front, the infiltration rate and the immersion time of the entire stack.(2) The difference of rainfall infiltration in the interlayers of the two groups of sediments is significant. The infiltration effect of the gravel group is stronger than the lateral diffusion. Infiltration, the infiltration at the interlayer is close to zero, and the velocity on both sides is significantly higher than that in the middle.(3) The local pore pressure accumulates in the developed clay interlayer accumulation, and the pore pressure at the foot of the slope is too high, while the gravel interlayer accumulation can provide a preferential infiltration path, and the pore pressure dissipates rapidly, so the overall stability of the clay group accumulation than the gravel group.
Key words:  Rainfall infiltration  Gravel interlayer  Clay interlayer  Accumulation
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