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考虑多层非饱和土降雨入渗的边坡稳定性分析
引用本文:石振明,沈丹祎,彭铭,张璐璐,张发旺,郑小站.考虑多层非饱和土降雨入渗的边坡稳定性分析[J].水利学报,2016,47(8):977-985.
作者姓名:石振明  沈丹祎  彭铭  张璐璐  张发旺  郑小站
作者单位:同济大学 地下建筑与工程系, 上海 200092;同济大学 岩土及地下工程教育部重点实验室, 上海 200092,同济大学 地下建筑与工程系, 上海 200092;同济大学 岩土及地下工程教育部重点实验室, 上海 200092,同济大学 地下建筑与工程系, 上海 200092;同济大学 岩土及地下工程教育部重点实验室, 上海 200092,上海交通大学 海洋工程国家重点实验室, 上海 200240;上海交通大学 土木工程系, 上海 200240,中国地质科学院 岩溶地质研究所, 广西 桂林 541004,广州市地质调查院, 广东 广州 510440
基金项目:“十二五”国家科技支撑计划(2012BAJ11B04);国家自然科学基金项目(51422905);上海市浦江人才计划(14PJ1408200)
摘    要:降雨是诱发滑坡的最主要因素之一,降雨入渗将显著降低非饱和土的基质吸力,从而降低边坡土体抗滑力。本文提出了考虑降雨入渗的多层非饱和土边坡稳定性分析方法。首先改进Green-Ampt入渗模型,提出适合多层非饱和土边坡降雨入渗的计算方法;然后得到各层土体在入渗各阶段的强度参数值;最后,采用强度折减法计算整个边坡在入渗条件下的安全系数。将本方法应用于广州大夫山滑坡案例发现滑动面和实际情况接近,为短期强降雨诱发的浅层滑坡。分析了不同降雨强度和历时对滑坡稳定性的影响,结果表明:降雨入渗导致边坡潜在最危险滑面的位置主要在浸润锋处或土体与基岩交界处。低强度长历时的降雨过程中,雨水入渗深度较大,易发生深层滑动;在高强度短历时的降雨过程中,雨水入渗深度较小,更易发生浅层滑动;随着降雨强度和降雨时间的增加,入渗深度增加,进而降低边坡的稳定性。

关 键 词:降雨入渗  非饱和土  入渗深度  强度参数  边坡稳定性
收稿时间:2015/10/26 0:00:00

Slope stability analysis by considering rainfall infiltration in multi-layered unsaturated soils
SHI Zhenming,SHEN Danyi,PENG Ming,ZHANG Lulu,ZHANG Fawang and ZHENG Xiaozhan.Slope stability analysis by considering rainfall infiltration in multi-layered unsaturated soils[J].Journal of Hydraulic Engineering,2016,47(8):977-985.
Authors:SHI Zhenming  SHEN Danyi  PENG Ming  ZHANG Lulu  ZHANG Fawang and ZHENG Xiaozhan
Affiliation:Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;Ministry of Education Key Laboratory of Geotechnical and Underground Engineering, Tongji University, Shanghai 200092, China,Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;Ministry of Education Key Laboratory of Geotechnical and Underground Engineering, Tongji University, Shanghai 200092, China,Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;Ministry of Education Key Laboratory of Geotechnical and Underground Engineering, Tongji University, Shanghai 200092, China,State Key Laboratory Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China;Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200240, China,Institute of karst geology, CAGS, Guilin 541004, China and Guangdong Geologic Survey Institute, Guangzhou 510440, China
Abstract:Rainfall is one of the major causes for slope failures. Rainfall infiltration reduces the slope resistance by largely lowering the matrix suction. The paper presents a method slope stability analysis of multi-layered unsaturated soils. Firstly,the Green-Ampt infiltration model is improved to calculate the infiltration depth in multi-layered unsaturated soils. Then, the soil strength parameters are estimated with consideration of rain infiltration. Finally, stability analysis is conducted by using of strength reduction method with ABAQUS. The method is applied to the case study of the Dafushan landslide in Guanzhou and found that the shallow slip surface in the simulation is close to the real case. Slope stability analyses are further conducted with different rainfall intensity and lasting period. It is found from the analysis that the slide surface is most probably located in wetting front or at the interface between the soils and bedrock. The long term and low density antecedent rainfall makes larger infiltration depth and deep seated slope failure;the short term and high density antecedent rainfall usually cause smaller infiltration depth and shallow seated slope failure;with the increase of rainfall intensity, rainfall duration, the infiltration depth increases, and then aggravate the slope failure.
Keywords:rainfall infiltration  unsaturated soils  infiltration depth  strength parameters  slope stability
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