Investigation of Large Deformation Failure Characteristics of Slopes Under Rainfalls Considering Spatial Variability of Hydraulic Conductivity
-
摘要: 合理评估降雨作用下边坡破坏特征是滑坡灾害防控及预警的重要前提.为了揭示土体渗透系数空间变异性对降雨作用下边坡大变形破坏特征的影响规律,综合利用极限平衡方法计算效率高和物质点法可模拟边坡大变形的优势,提出了随机极限平衡-物质点耦合分析方法(RLE-MPM),并开发了MATLAB-HYDRUS-Anura 3D这3个软件的接口实现程序.首先,利用HYDRUS模拟边坡降雨入渗过程,得到每个土层单元的含水率及孔隙水压力分布特征;其次,采用局部抗剪强度法更新每个物质点的等效抗剪强度及重度;最后,利用随机物质点法(RMPM)进行降雨作用下边坡大变形破坏概率计算、破坏模式识别及大变形破坏特征评估.研究结果表明:RLE-MPM方法可模拟日本Tokai-Hokuriku降雨型滑坡水-力耦合过程,模拟得到的滑坡最终堆积形态与现场调查结果基本一致.相较于RMPM,RLE-MPM方法计算边坡失效概率的效率更高,并且能够有效识别降雨作用下3种边坡破坏模式,即完全破坏模式、剪切带破坏模式、渐进式破坏模式.此外,降雨历时对非均质边坡大变形破坏模式及其特征均具有重要的影响.Abstract: Assessing the failure characteristics of slopes under rainfall is an essential prerequisite for preventing and early warning of landslide hazards.To reveal the impact of the spatial variability of hydraulic conductivity on the large deformation characteristics of slopes under rainfalls,the study proposes a coupling method of the random limit equilibrium and material point method (RLE-MPM) by making use of the high computational efficiency of limit equilibrium method and the capability of the material point method to simulate large deformation.An interface program for the implementation of MATLAB-HYDRUS-Anura 3D software is developed.First,the rainfall infiltration process of the slope is modeled using HYDRUS to obtain the distribution of water content and pore water pressure for each soil layer.Then,the local shear strength method (LSS) is used to update the equivalent shear strength and gravity for each material point.Finally,the random material point method (RMPM) is adopted to calculate the probability of slope failure,identify slope failure modes,and evaluate the large deformation failure characteristics of slopes under rainfalls.The proposed RLE-MPM can simulate the hydraulic-large deformation coupling process in the rainfall-induced landslides in Tokai-Hokuriku, Japan and the obtained final landslide accumulation pattern is generally consistent with the field investigations.Compared to RMPM,the proposed RLE-MPM has higher efficiency in calculating the probability of slope failure,and can effectively identify three kinds of failure modes of the slope under rainfalls,namely the complete failure mode,shear failure mode,and progressive failure mode.Additionally,the rainfall duration can greatly affect the large deformation failure modes and characteristics of the heterogeneous slope.
-
-
[1] Cui Q,Zhang L,Chen X,et al.Quantitative risk assessment of landslides with direct simulation of pre-failure to post-failure behaviors[J].Acta Geotechnica,2022,17:4497-4514
[2] Ali R,Kuriqi A,Kisi O.Human—environment natural disasters interconnection in China:A review[J].Climate,2020,8(4):48
[3] Zhu Y,Ishikawa T,Zhang Y,et al.A FEM-MPM hybrid coupled framework based on local shear strength method for simulating rainfall/runoff-induced landslide runout[J].Landslides,2022,19:2021-2032
[4] Chen X,Zhang L,Zhang L,et al.Modelling rainfall-induced landslides from initiation of instability to post-failure[J].Computers and Geotechnics,2021,129:103877
[5] Cho S E.Probabilistic stability analysis of rainfall-induced landslides considering spatial variability of permeability[J].Engineering Geology,2014,171:11-20
[6] Cai J S,Yeh T C J,Yan E C,et al.Uncertainty of rainfall-induced landslides considering spatial variability of parameters[J].Computers and Geotechnics,2017,87:149-162
[7] Yuan J,Papaioannou I,Straub D.Probabilistic failure analysis of infinite slopes under random rainfall processes and spatially variable soil[J].Georisk,2019,13(1):20-33
[8] Le T M H,Sanchez M,Gallipoli D,et al.Probabilistic study of rainfall-triggered instabilities in randomly heterogeneous unsaturated finite slopes[J].Transport in Porous Media,2019,126(1):199-222
[9] Jiang S H,Huang J,Griffiths D V,et al.Advances in reliability and risk analyses of slopes in spatially variable soils:A state-of-the-art review[J].Computers and Geotechnics,2022,141:104498
[10] Liao W,Ji J.Time-dependent reliability analysis of rainfall-induced shallow landslides considering spatial variability of soil permeability[J].Computers and Geotechnics,2021,129:103903
[11] Wang B,Hicks M A,Vardon P J.Slope failure analysis using the random material point method[J].Géotechnique Letters,2016,6(2):1-6
[12] Wang B,Vardon P J,Hicks M A.Rainfall-induced slope collapse with coupled material point method[J].Engineering Geology,2018,239:1-12
[13] Liu X,Wang Y.Probabilistic simulation of entire process of rainfall-induced landslides using random finite element and material point methods with hydro-mechanical coupling[J].Computers and Geotechnics,2021,132:103989
[14] Wu L Z,Selvadurai A P S,Zhang L M,et al.Poro-mechanical coupling influences on potential for rainfall-induced shallow landslides in unsaturated soils[J].Advances in water resources,2016,98:114-121
[15] Yang K H,Nguyen T S,Rahardjo H,et al.Deformation characteristics of unstable shallow slopes triggered by rainfall infiltration[J].Bulletin of Engineering Geology and the Environment,2021,80(1):317-344
[16] Cho S E,Lee S R.Evaluation of surficial stability for homogeneous slopes considering rainfall characteristics[J].Journal of Geotechnical and Geoenvironmental Engineering,2002,128(9):756-763
[17] Lu N,Godt J.Infinite slope stability under steady unsaturated seepage conditions[J].Water Resources Research,2008,44(11):W11404
[18] 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(5):892-898
[19] 王林,李典庆,曹子君,等.基于贝叶斯理论的土水特征曲线模型选择与参数识别方法[J].应用基础与工程科学学报,2019,27(6):1269-1284 Wang Lin,Li Dianqing,Cao Zijun,et al.Model selection and parameter identification method for soil-water characteristic curve based on Bayesian theory[J].Journal of Basic Science and Engineering,2019,27(6):1269-1284
[20] Anura 3D MPM Research Community.Anura3D Version 2022 Source Code,2022,www.anura3d.com
[21] Sulsky D,Schreyer H L.Axisymmetric form of the material point method with applications to upsetting and Taylor impact problems[J].Computer Methods in Applied Mechanics and Engineering,1996,139(1-4):409-429
[22] Liu X,Wang Y,Li D Q.Investigation of slope failure mode evolution during large deformation in spatially variable soils by random limit equilibrium and material point methods[J].Computers and Geotechnics,2019,111:301-312
[23] Chen X,Zhang L,Zhang L,et al.Modelling rainfall-induced landslides from initiation of instability to post-failure[J].Computers and Geotechnics,2021,129:103877
[24] Llano-Serna M A,Farias MM,Pedroso D M.An assessment of the material point method for modelling large scale run-out processes in landslides[J].Landslides,2016,13:1057-1066
[25] Sandwell D T.Biharmonic spline interpolation of GEOS-3 and SEASAT altimeter data[J].Geophysical Research Letters,1987,14(2):139-142
[26] Griffiths D V,Huang J,Dewolfe G F.Numerical and analytical observations on long and infinite slopes[J].International Journal for Numerical and Analytical Methods in Geomechanics,2011,35(5):569-585
[27] 蒋先平,张鹏,卢艺伟,等.物质点强度折减法边坡失稳判据选择方法[J].地质科技通报,2022,41(2):113-122 Jiang Xianping,Zhang Peng,Lu Yiwei,et al.Selection method for instability criterion of slope based on material point strength reduction method[J].Bulletin of Geological Science and Technology,2022,41(2):113-122
[28] Cai J S,Yeh T C J,Yan E C,et al.Importance of variability in initial soil moisture and rainfalls on slope stability[J].Journal of Hydrology,2019,571:265-278
[29] 华辉有,陈启买,刘海,等.一种融合Kmeans和KNN的网络入侵检测算法[J].计算机科学,2016,43(3):158-162 Hua Huiyou,Chen Qimai,Liu Hai,et al.A network intrusion detection algorithm that combinesKmeans and KNN[J].Computer Science,2016,43(3):158-162
-
期刊类型引用(3)
1. 董建军，杨明甫，冯晓硕，姜浩. 石灰石矿区潜在滑移区早期识别与形变特征分析. 安全与环境学报. 2025(01): 132-140 . 
百度学术
2. 马明红，王胆，王振伟，李元浩，陈奇. 降雨入渗作用下含泥岩弱层边坡变形机理研究. 露天采矿技术. 2025(01): 12-15 . 百度学术
3. 元志镕，蒋水华，常志璐，向晖，刘玉伟，黄劲松. 考虑初始含水率非均匀分布及孔隙水重分布的边坡可靠度分析. 岩土力学. 2025(03): 1001-1012 . 百度学术
其他类型引用(3)
计量
- 文章访问数: 135
- HTML全文浏览量: 1
- PDF下载量: 44
- 被引次数: 6
下载:
