首页|考虑渗透系数空间变异性的降雨作用下边坡大变形破坏特征

考虑渗透系数空间变异性的降雨作用下边坡大变形破坏特征

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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.
Investigation of Large Deformation Failure Characteristics of Slopes Under Rainfalls Considering Spatial Variability of Hydraulic Conductivity
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.

rainfall-induced landslideslope failurespatial variabilitylarge deformationfailure modesfailure characteristic analysis

李剑平、蒋水华、黄发明、黄劲松

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南昌大学工程建设学院,江西南昌 330031

降雨诱发滑坡 边坡失稳 空间变异性 大变形 破坏模式 破坏特征

国家自然科学基金优秀青年基金国家自然科学基金国家自然科学基金江西省自然科学基金江西省自然科学基金

52222905521791034227232620224ACB20401920232ACB204031

2024

10.16058/j.issn.1005-0930.2024.01.005

应用基础与工程科学学报
中国自然资源学会

应用基础与工程科学学报

CSTPCD北大核心
影响因子：0.895
ISSN：1005-0930
年,卷(期)：2024.32(1)
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