考虑坡面积水的大孔隙边坡点稳定系数研究

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中图分类号：U416.1 文献标识码：A 文章编号：1673-9868（2026）02-0233-13

Abstract： In order to reveal the instability mechanism shallow layer macropore slope under heavy rainfall，the setting method for rainfallboundary conditions macropore slope was proposed based on Green-Ampt model Kinematic wave approximation equation. A calculation model point stability coefficient considering slope surface ponding was established by combining the dual-permeability model stability coefficient field theory. The embedding coupling terms was achieved through secondary development based on the COMSOL Multiphysics platform. Taking a subgrade slope Zhenghe Section Ningwu Expressway in Fujian Province as an example，the diferences point stability coeficient between homogeneous soil slope （without macropores） macropore slope （with macropores）were compared， the influences parameters such as the proportion macropore （ωf） ，water exchange coefficient （αw ） the ratio water conductivity in two domains （μ） on slope stability were analyzed. The improved boundary conditions were reasonable by comparing the simulated with experimental values. The results showed that： ① The macropore slope mainly caused shallow instability failure， the potential slip surface was roughly parallel to the slope surface. Under heavy rainfall，the stability the macropore slope was significantly lower than that homogeneous soil slope， the area the potential instability was about 2.4 times that the homogeneous soil slope. ② The area curve potential slope instability zone showed a“step type” growth. With the increase ωf ，the response pore water pressure in deeper soils became more obvious，the minimum point stability coeficient decreased by 28.1% ， the area the potential instability increased by 128.0% . With the increase αw ，the maximum instability depth increased by 25.0% . As μ increased，the potential instability zone extended outward from the slope foot， the instability area increased by 3.7% ： ③ Among the three parameters， ωf had the greatest influence on the stability slope. Slopes with macropores were more prone to shallow instability failure under the condition heavy rainfall or continuous rainfall.

Key words： macropore slope；the coupling effect runf-infiltration; point stability coefficient； the proportion macropore; shallow instability

极端降雨引发的边坡失稳与路基塌陷是岩土工程领域持续关注的重大问题[1-2]，四川汉源山洪灾害和广东梅大高速路基塌陷事件进一步凸显了降雨诱发滑坡机理研究的紧迫性。（剩余10609字）