董建军,王思萌,郭占勇,郑卫锋

• 1:辽宁工程技术大学土木工程系
• 2:大连理工大学工程力学系
• 3:中建三局集团有限公司总承包公司
• 4:中国电力科学研究院

摘要(Abstract)：

土质边坡在降雨条件下发生的破坏失稳与土体的非饱和-饱和状态变化存在必然的内在关联。考虑土质边坡的非饱和-饱和状态变化,以此建立非饱和土抗剪强度与基质吸力之间的函数关系,并结合基质吸力的理论分布规律,运用非饱和土边坡的稳定性分析方法研究边坡安全系数,分析土体由非饱和状态向饱和状态的转变过程中边坡安全系数的变化规律。结果表明,雨水入渗使得土体由非饱和状态向饱和状态进行转变;在坡脚处最先出现塑性区,并逐渐向坡顶发展,直至形成贯通塑性区而使土体破坏;土质边坡的滑移面由浅层滑移向深层滑移发展;结合不同的入渗深度下边坡的瞬态安全系数值的变化规律,能够量化计算边坡失稳的临界入渗深度值,为实际工程提供合理的判断依据。

关键词(KeyWords)： 非饱和-饱和状态;基质吸力;抗剪强度;土质边坡;安全系数;滑坡地质灾害;黏聚力;内摩擦角

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51479023);; 辽宁省自然科学基金项目(201602349)

作者(Author): 董建军,王思萌,郭占勇,郑卫锋

DOI: 10.13928/j.cnki.wrahe.2018.11.025

参考文献(References)：

• [1] FREDLUND D G,RAHARDJO H. Soil mechanics for unsaturated soils[M]. New York:Wiley Inter,1993.
• [2]栾茂田,李顺群.非饱和土的理论土-水特征曲线[J].岩土工程学报,2005,27(6):611-615.
• [3]卢肇钧,张惠明,陈建华,等.非饱和土的抗剪强度与膨胀压力[J].岩土工程学报,1992,14(3):1-8.
• [4]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,2004,26(1):1-15.
• [5]邵龙潭,郭晓霞,郑国锋.粒间应力、土骨架应力和有效应力[J].岩土工程学报,2015,37(8):1478-1483.
• [6]邵龙潭.饱和土的土骨架应力方程[J].岩土工程学报,2011,33(12):1833-1837.
• [7]方薇.一种非饱和土的非线性抗剪强度包络壳模型[J].岩石力学与工程学报,2018,37(11):2601-2609.
• [8]曾茂宗,甘建军,陈炳贵.基质吸力对非饱和滑带土抗剪强度的影响试验研究[J].工程勘察,2018,46(11):7-12.
• [9] SHEN Z,JIANG M,THORNTON C. Shear strength of unsaturated granular soils:three-dimensional discrete element analyses[J].Granular matter,2016,18(3):1-13.
• [10]徐筱,赵成刚,蔡国庆.区分毛细和吸附作用的非饱和土抗剪强度模型[J].岩土力学,2018,39(6):2059-2064,2072.
• [11]肖元清,胡波,王钊.基质吸力对非饱和土抗剪强度影响的试验研究[J].三峡大学学报(自然科学版),2005,27(4):326-328.
• [12] TSAI T L. Influences of soil water characteristic curve on rainfall-induced shallow landslides[J]. Environmental earth sciences,2011,64(2):449-459.
• [13]杨何,汤明高,叶润青.三峡库区滑坡堆积体非饱和土的土—水特征研究[J].水利水电技术,2017,48(9):168-173.
• [14] ANTINORO C,ARNONE E,NOTO L V. The use of soil water retention curve models in analyzing slope stability in differently structured soils[J]. Catena,2017,150:133-145.
• [15] QI S,VANAPALLI S K. Hydro-mechanical coupling effect on surficial layer stability of unsaturated expansive soil slopes[J]. Computers and geotechnics,2015,70:68-82.
• [16] SATTARI A S,TOKER N K. Obtaining soil-water characteristic curves by numerical modeling of drainage in particulate media[J].Computers and geotechnics,2016,74:196-210.
• [17] LING H,LING H I. Centrifuge model simulations of rainfall-induced slope instability[J]. Journal of geotechnical and geoenvironmental engineering,2012,138(9):1151-1157.
• [18] MUKHLISIN M,BAIDILLAH M R,IBRAHIM A,et al. Effect of soil hydraulic properties model on slope stability analysis based on strength reduction method[J]. Journal of the Geological Society of India,2014,83(5):586-594.
• [19] LU N. LIKOS W J.非饱和土力学[M].韦昌富,侯龙,简文星译.北京:高等教育出版社,2012.
• [20]赵成刚,张雪东.非饱和土中功的表述以及有效应力与相分离原理的讨论[J].中国科学(E辑:技术科学),2008,38(9):1453-1463.
• [21]林鸿州,李广信.基质吸力对非饱和土抗剪强度的影响[J].岩土力学,2007,28(9):1931-1936.
• [22] VAN GENUCHTEN M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America journal,1980,44:892-898.
• [23]吴俊杰,王成华,李广信.非饱和土基质吸力对边坡稳定的影响[J].岩土力学,2004,25(5):732-736.
• [24]陈善雄,陈守义.考虑降雨的非饱和土边坡稳定性分析方法[J].岩土力学,2001,22(4):447-450.
• [25]董建军,邵龙潭.考虑端部效应影响的非饱和压实土三轴试验研究[J].岩石力学与工程学报,2010,29(9):1937-1944.
• [26] GARDNER W R. Some steady state solutions of the unsaturated moisture flow equation with application to evaporation from a water table[J]. Soil science,1958,85(4):228-232.
• [27]李毅,伍嘉.基于FLAC3D的饱和-非饱和渗流分析[J].岩土力学,2012,33(2):617-622.
• [28] LI W C,LEE L M,CAI H,et al. Combined roles of saturated permeability and rainfall characteristics on surficial failure of homogeneous soil slope[J]. Engineering geology,2013,153(2):105-113.