姜思源, 向喜琼, 李彦荣,等.降雨入渗下岩堆细颗粒运移沉积物理模拟研究[J].河南理工大学学报（自然科学版）,2023,42(2):77-86.

JIANG S Y, XIANG X Q, LI Y R,et al.Physical simulation study on the migration and deposition of fine particles in rock piles under rainfall infiltration conditions[J].Journal of Henan Polytechnic University(Natural Science) ,2023,42(2):77-86.

降雨入渗下岩堆细颗粒运移沉积物理模拟研究

姜思源1, 向喜琼1,2, 李彦荣3, 杨鑫婷2, 王军义1, 谭利丽1, 吕亚东1

1.贵州大学 喀斯特地质资源与环境教育部重点实验室，贵州 贵阳  550025；2.贵州大学 资源与环境工程学院，贵州 贵阳  550025；3.太原理工大学 矿业工程学院，山西 太原  030024

摘要:针对岩堆沿圆弧滑面滑动失稳破坏问题，开展降雨入渗下岩堆细颗粒运移沉积物理模拟试验，揭示岩堆内部圆弧滑面形成过程，分析细颗粒在岩堆中的运移沉积规律和沉积结构形式，并基于大剪试验对骨架型岩堆进行稳定性分析，定性解释细颗粒分布与稳定性之间的关系。结果表明：在一定孔隙结构、细颗粒条件和水动力条件下，岩堆内的细颗粒易随地下水渗流路径迁移，形成岩堆内圆弧状相对隔水层；通过试验统计，岩堆中存在多级圆弧沉积面、浅表层圆弧沉积面和基底近直线圆弧沉积面，这些部位由粗粒土转变为碎石土，渗透系数降低，地下水入渗造成孔压、渗透压增大，内摩擦角降低，影响岩堆稳定性；对于崩塌之初以骨架型为主的岩堆，内部细颗粒的运移沉积可能引起岩堆的失稳破坏；基于高密度电法的贵州某岩堆实例探测可知，细颗粒运移造成岩堆浅层滑坡的可能性较大。

关键词:岩堆;细颗粒;运移;沉积;圆弧滑面

doi:10.16186/j.cnki.1673-9787.2021010077

基金项目:国家自然科学基金资助项目（41877276）；贵州省国土资源厅重大专项项目（贵州省重点地质灾害风险评价与管控示范）；贵州省科技平台及人才团队计划项目（黔科合平台人才［2017］5402号）

收稿日期:2021/01/18

修回日期:2021/03/26

出版日期:2023/03/25

Physical simulation study on the migration and deposition of fine particles in rock piles under rainfall infiltration conditions

JIANG Siyuan1, XIANG Xiqiong1,2, LI Yanrong3, YANG Xinting2, WANG Junyi1, TAN Lili1, LYU Yadong1

1.Key Laboratory of Karst Geological Resources and Environment of Ministry of Education，Guizhou University，Guiyang  550025，Guizhou，China；2.College of Resources and Environmental Engineering，Guizhou University，Guiyang  550025， Guizhou，China；3.School of Mining Engineering，Taiyuan University of Technology，Taiyuan  030024，Shanxi，China

Abstract:The physical simulation of the migration and deposition of fine particles in the rock pile under rainfall infiltration was carried out to address the problem of instability and failure of the rock pile along the circular sliding surfaces.The test revealed the formation process of circular sliding surfaces inside the rock pile，and the migration and deposition pattern of fine particles and the form of deposition structure was analyzed.Based on the large-sized shear test， the stability of the skeleton rock pile was analyzed，and the results qualitatively explained the relationship between the distribution of fine particles and stability.The study showed that under certain pore structures，fine particle conditions and hydrodynamic conditions，the fine particles easily migrated with the groundwater seepage path to form a circular relative water-resisting layer in the rock pile.According to the experimental statistics，there were multi-level circular depositional surfaces，shallow superficial circular depositional surfaces and basal sublinear circular depositional surfaces in the rock pile.These areas were transformed from coarse grained soils to gravelly soils and the permeability coefficient was decreased.Groundwater infiltration caused an increase in pore pressure and osmotic pressure and a decrease in the angle of internal friction，which affected the stability of the rock pile.For rock piles that were mainly skeletal at the beginning of the collapse，the migration and deposition of internal fine particles might cause destabilization of the rock pile.Based on the detection of a rock pile in Guizhou by high-density electrical method，it was clear that the migration of fine particles was more likely to cause shallow landslides in rock piles.

Key words:rock pile;fine particle;migration;deposition;circular sliding surface

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