卿 贤

膨胀土因具有显著胀缩特性，易在环境变化下引发边坡浅层破坏，威胁基础设施安全。本文基于毛细阻滞原理，提出一种柔性生态防护系统，采用植被层-细粒层-粗粒层三元结构：植被层阻滞雨水下渗，细粒层通过毛细屏障效应储存水分，粗粒层快速排水，协同调控边坡水分迁移，抑制胀缩循环。以瓦东干渠1#滑坡为案例，结合毛细屏障理论优化设计参数，构建柔性防护体系，实现膨胀土边坡的稳定性提升。该系统通过分层阻渗-蓄水-排水机制，减少水分入渗对土体结构的扰动，为膨胀土边坡治理提供了一种生态化、可持续的解决方案，兼具工程实用性与环境适应性，可为类似工程提供参考。

毛细屏障效应；膨胀土边坡；柔性生态防护系统

[1] 李生林, 施斌, 杜延军. 中国膨胀土工程地质研究 [J]. 自然杂志, 1997, (02): 82-6. [2] 殷宗泽, 袁俊平, 韦杰, et al. 论裂隙对膨胀土边坡稳定的影响 [J]. 岩土工程学报, 2012, 34(12): 2155-61. [3] 殷宗泽, 韦杰, 袁俊平, et al. 膨胀土边坡的失稳机理及其加固 [J]. 水利学报, 2010, 41(01): 1-6. [4] 谢灿荣, 董宏源, 裴佩, et al. 滴灌作用下膨胀土边坡表层含水量影响因素分析 [J]. 人民长江, 2018, 49(17): 31-8. [5] 刘华强, 殷宗泽. 裂缝对膨胀土抗剪强度指标影响的试验研究 [J]. 岩土力学, 2010, 31(03): 727-31. [6] 包承纲. 非饱和土的性状及膨胀土边坡稳定问题 [J]. 岩土工程学报, 2004, (01): 1-15. [7] 徐光明, 王国利, 顾行文, et al. 雨水入渗与膨胀性土边坡稳定性试验研究 [J]. 岩土工程学报, 2006, (02): 270-3. [8] KHIRE M V, BENSON C H, BOSSCHER P J. Field Data from a Capillary Barrier and Model Predictions with UNSAT-H [J]. Journal of Geotechnical and Geoenvironmental Engineering, 1999, 125(125): 518-27. [9] 焦卫国. 西北黄土/碎石覆盖层水分存储-释放机理及防渗设计方法 [D]; 浙江大学. [10] STORMONT J C, MORRIS C E. Method to Estimate Water Storage Capacity of Capillary Barriers [J]. Journal of Geotechnical Geoenvironmental Engineering, 1998, 124(4): 297-302. [11] RP. B B A M C. The behavior of inclined covers used as oxygen barriers [J]. Canadian Geotechnical Journal, 2003, 40(3). [12] NYHAN J W, HAKONSON T E, DRENNON B J. A Water Balance Study of Two Landfill Cover Designs for Semiarid Regions [J]. Journal of Environmental Quality, 1990, 19(2): 281. [13] KAMPF M, HOLFELDER T, MONTENEGRO H. Identification and parameterization of flow processes in artificial capillary barriers [J]. Water Resources Research, 2003, 39(10): 85-94. [14] SMESRUD J K, SELKER J S. Effect of Soil-Particle Size Contrast on Capillary Barrier Performance [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2001, 127(10): 885-8. [15] CHEN R, LIU J, NG C, et al. Influence of Slope Angle on Water Flow in a Three-Layer Capillary Barrier Soil Cover under Heavy Rainfall [J]. Soil Science Society of America Journal, 2019. [16] RAHARDJO H, SANTOSO V A, LEONG E C, et al. Performance of an Instrumented Slope Covered by a Capillary Barrier System [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2011, 138(4): 481-90. [17] RAHARDJO H, KIM Y, GOFAR N, et al. Field instrumentations and monitoring of GeoBarrier System for steep slope protection [J]. Transportation Geotechnics, 2018: S221439121730209X-. [18] RAHARDJO H, KIM Y, SATYANAGA A. Role of unsaturated soil mechanics in geotechnical engineering [J]. International Journal of Geo-Engineering, 2019, 10(1). [19] 李光耀. 毛细阻滞型覆盖层微观-宏观水气传导特性及服役性能 [D]; 浙江大学, 2020. [20] 焦卫国, 詹良通, 季永新, et al. 黄土–碎石毛细阻滞覆盖层储水能力实测与分析 [J]. 岩土工程学报, 2019, 41(06): 1149-57. [21] 杜磊. 毛细阻滞式覆盖系统的数值模拟研究 [D]; 哈尔滨工业大学, 2011. [22] 邓林恒. 湿润气候区毛细阻滞型覆盖层性能试验研究及其工程应用 [D]; 浙江大学, 2011. [23] PARENT S E, CABRAL A. Design of Inclined Covers with Capillary Barrier Effect [J]. Geotechnical and Geological Engineering, 2006, 24(3): 689-710. [24] KISCH M. The theory of seepage from clay-blanketed reservoirs [J]. Geotechnique, 1959, 9(1): 9-21. [25] ROSS B. The diversion capacity of capillary barriers Water Resources Research [J]. Water Resources Research, 1990, 26(10).

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