引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 213次   下载 154 本文二维码信息
码上扫一扫!
分享到: 微信 更多
降雨在裂隙型冰水堆积体中的入渗过程
赵石力1, 涂国祥1, 郑智明2, 丁昊1
1.成都理工大学 地质灾害防治与地质环境保护国家重点实验室, 四川 成都 610059;2.广东华隧建设集团股份有限公司, 广东 广州 510000
摘要:
[目的] 探究降雨在裂隙型堆积体中的入渗过程,研究降雨条件下土坡内体积含水率、基质吸力、孔压等的变化情况及湿润锋迁移规律,为降雨诱发覆盖层斜坡失稳机理提供理论支持。[方法] 针对两类不同结构堆积体土样进行室内模型试验。[结果] 均质模型中湿润峰均匀下渗,锋面达测点后引发孔压及体积含水率减小和基质吸力增加;坡顶受降雨影响变化明显,而坡底变化具有累积效应;裂隙构成雨水入渗的优势通道,其底部会形成暂态饱和区,湿润锋面在该区域产生强烈下凹形成渗透“漏斗”,促使湿润锋在该区域先期触底; [结论] 降雨入渗过程为: ①均质型:完全入渗→入渗放缓→稳定入渗→饱和入渗;②裂隙发育型:完全入渗→局部强烈下渗→补偿加速下渗→水平侧渗。
关键词:  降雨入渗  冰水堆积体  裂隙  模型试验  湿润锋
DOI:10.13961/j.cnki.stbctb.2018.06.002
分类号:
基金项目:国家自然科学基金项目“降雨在山谷型古冰水堆积体中非线性入渗过程及其对稳定性影响的时间效应”(41472274)
Influence of Fissures on Rainfall Infiltration Process in Outwash Congeries
ZHAO Shili1, TU Guoxiang1, ZHENG Zhiming2, DING Hao1
1.State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection, Chengdu University of Technology, Chengdu, Sichuan 610059, China;2.China Tunnel Construction Group Co. Ltd. Guangdong, Guangzhou, Guangdong 510000, China
Abstract:
[Objective] In order to investigate the rainfall infiltration process in fractured deposits, this study focuses on the variation of volume moisture content, matric suction, pore pressure and other changes in soil slope under rainfall conditions, as well as the migration low of wetting, which will provide theoretical support for the instability mechanism of rain-induced overburden slope.[Methods] The indoor model tests of two types of different structural soil deposits were carried out.[Results] The wetting fronts in the homogeneous accumulations were uniformly moving downward, the pore pressure and water content decreased and the matric suction increased when the wetting fronts reach the measuring points. The change of top slope were affected obviously by rainfall while the bottom showed a cumulative effect. The fissures constituted the dominant channel for rainwater infiltration and there was a transient saturated zone at the bottom of the fissures. The wetting fronts produced a strong depressions in this area that form a percolation "funnel" that causes the wetting fronts to reach its bottom in advance.[Conclusion] The rainfall infiltration processes are in the sequence of complete infiltration→slow infiltration→stable infiltration→saturated infiltration for homogeneous model and in the sequence of complete infiltration→local strongly infiltration→compensation accelerated infiltration→horizontal lateral infiltration for fracture model.
Key words:  rainfall infiltration  outwash congeries  fissures  model tests  wetting front