首页|黄土微观结构优先连通模型及其对优先渗流的意义

黄土微观结构优先连通模型及其对优先渗流的意义

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开展黄土微观结构研究有助于揭示宏细观黄土体渗流、黄土滑坡滑动面形成机制和过程.构建了含裂隙和不含裂隙两类黄土微观结构连通模型,探讨了孔隙连通率p、孔隙变异系数λ、裂隙最大跨度ω及裂隙网络贯通率q等参数之间的关系,并通过黄土微观结构扫描式电子显微镜试验和野外渗流试验对两类模型的连通阈值进行了验证.结果表明:裂隙的存在,特别是其跨度大小,对黄土孔隙形态大小及其分布特征具有重要影响;裂隙是优先流的重要通道,是较低孔隙率条件下发生黄土优先流的重要原因;黄土微观结构优先连通模型研究结论与黄土渗流试验结论基本吻合,揭示了泾阳南塬"漫灌式"灌溉行为对含裂缝的高陡边坡稳定性的不利影响以及东风村、蒋刘村等大型滑坡发生的根本原因.
Priority connectivity model of loess microstructure and its significance for preferential flow
Investigation of loess microstructure can reveal information on the seepage of loess masses and the formation and evolution of sliding surfaces in loess landslides at both macroscopic and mesoscopic levels.A loess microstructure connectivity model,both with and without fractures,is established to investigate the relationships among pore connectivity p,pore variation coefficient λ,maximum fracture span ω,and fracture network penetration q.The connectivity thresholds of these two models are verified through scanning electron microscopy analysis and field seepage tests of loess microstructure.The results show that the existence of fractures,especially their time spans,substantially affects the morphology,size,and distribution of pores in loess.Fractures are important channels for preferential flow and significant contributors to loess preferential seepage under low porosities.The research conclusions from the loess microstructure preferential connectivity model studies agree with the loess seepage test results.These results explain the negative effects of the"flooding-type"irrigation in Nanyuan,Jingyang County,on the stability of high-angle slopes containing fractures and the occurrence of major landslides in Dongfeng and Jiangliu villages.

loesspreferential flowconnectivitymicrostructuregeographic information system(GIS)

潘网生、赵恬茵、李鑫

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黔南民族师范学院旅游与资源环境学院,贵州都匀 558000

石家庄铁道大学土木工程学院,河北石家庄 050043

黄土 优先流 连通性 微观结构 地理信息系统

黄土高原土壤侵蚀与旱地农业国家重点实验室项目中央引导地方科技发展资金项目河北省自然科学基金黔南民族师范学院支持引进高层次人才研究专项黔南民族师范学院重点研究科研能力提升项目(2024)

A314021402-202113236Z5405GE20212100922021qnsyrc032024zdzk07

2024

10.16285/j.rsm.2023.1150

岩土力学
中国科学院武汉岩土力学研究所

岩土力学

CSTPCD北大核心
影响因子：1.614
ISSN：1000-7598
年,卷(期)：2024.45(6)