降雨入渗下非饱和土质边坡稳定性的最小势能法研究

黄强 程勇刚 周伟 常晓林

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中国农村水利水电 ›› 2018 ›› (1) : 154-160.
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降雨入渗下非饱和土质边坡稳定性的最小势能法研究

  • 黄 强1,2 ,程勇刚1,2 ,周 伟1,2 ,常晓林1,2
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Minimum Potential Energy Method for Stability Analysis of Unsaturated Soil Slope under Rainfall Infiltration

  • HUANG Qiang1,2 ,CHENG Yong-gang1,2 ,ZHOU Wei1,2 ,CHANG Xiao-lin1,2 
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摘要

研究一种可以考虑基质吸力时空分布和渗流作用的非饱和土质边坡稳定性分析方法具有重要意义。将边坡视为一个整体,引入不同时刻滑面上的水压力来考虑非稳定非饱和渗流对系统势能的作用,建立势能函数,并基于最小势能原理求出滑体位移,获得滑面上的法向应力分布。同时基于Fredlund非饱和土抗剪强度理论,确定基质吸力对滑面抗剪强度参数的影响,从而建立非稳定非饱和渗流条件下的最小势能法边坡稳定安全系数表达式。与传统极限平衡法的不同在于,最小势能法不需要划分条块,不对条间力作假定,满足平衡微分方程和力的边界条件。以降雨入渗下的边坡稳定分析为例,结果表明该方法计算结果与其他常用方法基本一致,验证了该方法的有效性,而且最小势能法无需迭代,计算过程简单,具有较好的实用价值。

Abstract

It is significant to propose a method of unsaturated soil slope stability analysis accounting for the distribution of matric suction and the effect of seepage. Considering the slope as a whole,its potential function including the contribution of transient unsaturated seepage without any assumption on the shape of sliding surface is established. Based on the minimum potential energy principle and Fredlund's shear strength theory of unsaturated soils,a formula of factor of safety ( FS) of minimum potential energy method is derived. In contrast with classical limit equilibrium method,the advantage of minimum potential energy method is that it can satisfy the equilibrium differential equation and the force boundary conditions without being divided into slices. In a case of stability analysis of slope under rainfall infiltration, the good comparison with Spencer Method and Morgenstern-Price Method shows the effectiveness of minimum potential energy method and its good practical value due to the simple calculation without iteration

关键词

最小势能法 / 降雨入渗 / 非稳定非饱和渗流 / 边坡稳定

Key words

minimum potential energy method / rainfall infiltration / transient unsaturated seepage / slope stability

基金

国家自然科学基金资助;国家自然科学基金资助

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导出引用
黄强 程勇刚 周伟 常晓林. 降雨入渗下非饱和土质边坡稳定性的最小势能法研究[J].中国农村水利水电, 2018(1): 154-160
HUANG Qiang, CHENG Yong-gang, ZHOU Wei, CHANG Xiao-lin. Minimum Potential Energy Method for Stability Analysis of Unsaturated Soil Slope under Rainfall Infiltration[J].China Rural Water and Hydropower, 2018(1): 154-160

参考文献

[1] 黄润秋. 20世纪以来中国的大型滑坡及其发生机制[J]. 岩石力学与工程学报, 2007, 26(3): 433-454.
[2] 周创兵, 李典庆. 暴雨诱发滑坡致灾机理与减灾方法研究进展[J]. 地球科学进展, 2009, 24(5): 477-487.
[3] Fredlund D G, Rahardjo H. Soil mechanics for unsaturated soils[M]. New York: Wiley, 1993.
[4] 黄润秋, 戚国庆. 非饱和渗流基质吸力对边坡稳定性的影响[J]. 工程地质学报, 2002, 10(4): 343-348.
[5] Fredlund D G, Krahn J. Comparison of slope stability methods of analysis[J]. Canadian Geotechnical Journal, 1977, 14(3): 429-439.
[6] Alonso E, Gens A, Lioret A, et al. Effect of rain infiltration on the stability of slopes[J]. Unsaturated Soils, 1995, 1: 241-249.
[7] Cai F, Ugai K. Numerical analysis of rainfall effects on slope stability[J]. International Journal of Geomechanics, ASCE, 2004, 4(2): 69-78.
[8] HUANG Mao-song, JIA Cang-qin. Strength reduction FEM in stability analysis of soil slopes subjected to transient unsaturated seepage[J]. Computers and Geotechnics, 2009, 36(1-2): 93-101.
[9] 荣冠, 王思敬, 王恩志,等. 强降雨下元磨公路典型工程边坡稳定性研究[J]. 岩石力学与工程学报, 2008, 27(4):704-711.
[10] 李荣建, 于玉贞, 邓丽军, 等. 非饱和土边坡稳定分析方法探讨[J]. 岩土力学, 2007, 28(10): 2060-2064.
[11] Mauldon M,Ureta J. Stability of rock wedges with multiple sliding surface[J]. Candian Geotechnital Journal, 1996, 14(1): 51-66.
[12] 李小强, 白世伟, 李铀. 最小势能方法在二维边坡稳定分析中的应用[J]. 岩土力学, 2004, 25(6): 909-912.
[13] 李铀, 陆洋, 李铌. 锚杆(索)加固边坡的最小势能稳定分析方法研究[J]. 岩土力学, 2008, 29(9): 2329-2334.
[14] 沈爱超, 李铀. 单一地层任意滑移面的最小势能边坡稳定性分析方法[J]. 岩土力学, 2009, 30(8): 2463-2466.
[15] 温树杰, 罗惠, 李铀, 等. 基于最小势能原理的三维边坡稳定性分析[J]. 岩石力学与工程学报, 2015, 34(增1): 3298-3305.
[16] Morgenstern N R, Price V E. The analysis of the stability of General Slip Surface[J]. Geotechnique, 1965, 15(1):79-93.
[17] 陈祖煜. 土坡稳定分析通用条分法及其改进[J]. 岩土工程学报, 1983, 5(4):11-27.
[18] 吴宏伟, 陈守义, 庞宇威,等. 雨水入渗对非饱和土坡稳定性影响的参数研究[J]. 岩土力学, 1999, 20(1):1-14.
[19] 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.
[20] Fredlund D G, Morgenstern N R, Widger R A. The shear strength of unsaturated soils[J]. Canadian Geotechnical Journal, 1978, 15(3): 313-321.
[21] Vannpalli S K, Fredlund D G, Pufahl D E, et al. Model for the prediction of shear strength with respect to soil suction[J]. Canadian Geotechnical Journal, 1996, 33(3): 379-392.
[22] VAN G M T. A closed-form equation for predicting the hydraulic conductivity of unsaturated soils[J]. Soil Science Society of America Journal, 1980, 44(5): 892-898.
[23] Geo-Slope International Ltd. User’s guide for finite element seepage analysis[M]. Canada: Geo-Slope International Ltd., 2007.
[24] Geo-Slope International Ltd. User’s guide for slope stability analysis[M]. Canada: Geo-Slope International Ltd., 2007.
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