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任钟刚

 

(水发规划设计有限公司 , 济南   250000)

摘  要: 为探究非均质砂黏互层堤基中渗透通道的演化规律及其对边坡稳定性的影响 , 通过室内渗流试验和大型边坡物理模型试验 , 从通道深度 、纵向位置 、数量三个方面分析孔隙水压力和边坡整体破坏时间的演化特性 。室内试验发现砂土和黏土的渗透性差别较大 , 水力梯度为 4. 5 时在砂黏界面处发生管涌 , 形成集中渗流通道 。边坡模型试验结果表明 : 通道深度增加时 , 破坏时间显著缩短 , 孔隙水压力峰值呈增大趋势 ; 越靠近坡脚 , 水力响应越快 , 破坏时间最短  (2. 9 h) , 峰值压力最高  (41. 20 kPa) ; 通道数量增多形成局部渗流网络 , 使破坏时间提前且峰值压力增大 ; 优势渗流通道加快了孔隙水压力的积累和消散过程 , 造成非均质砂黏互层边坡失稳 。研究成果可为非均质土层中渗流风险的识别及防控措施优化提供参考。

关键词: 砂黏互层 ; 渗流通道 ; 孔隙水压力 ; 水力梯度 ; 边坡稳定

中图分类号: TV223. 4      文献标志码: A      文章编号: 1005-8249 (2026) 04-0122-06

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 018

 

Effect of Seepage Channel Evolution in Heterogeneous Sand-Clay

Interbedded Levee Foundation on Slope Stability

REN Zhonggang

(Shui Fa Planning & Design Co. , Ltd. , Ji ’nan 250000, China)

Abstract: To explore the evolution law of seepage channels in heterogeneous sand-clay interbedded embankment foundations and its influence on slope stability, through indoor seepage tests and large-scale slope physical model tests, the evolution characteristics of pore water pressure and overall slope failure time were analyzed from three aspects: channel depth, longitudinal position, and quantity. The indoor tests found that the permeability of sand and clay was significantly different. When the hydraulic gradient was 4. 5, piping occurred at the sand-clay interface, forming a concentrated seepage channel.  The results of the slope model tests indicated that as the channel depth increased, the failure time decreased significantly while the peak pore water pressure increased; the closer to the toe of the slope, the faster the hydraulic response, with the shortest failure time (2. 9 hours) and the highest peak pressure (41. 20 kPa) ; the increase in the number of channels formed a local seepage network, which advanced the failure time and increased the peak pressure; the dominant seepage channels accelerated the accumulation and dissipation process of pore water pressure , causing instability of the heterogeneous sand-clay interbedded slope. The research results can provide a reference for the identification of seepage risks and the optimization of control measures in heterogeneous soil layers.

Key words: sand-silt interbedded layer; seepage channel; pore water pressure; hydraulic gradient; slope stability