考虑优势流作用的降雨入渗边坡可靠度分析

doi:10.16285/j.rsm.2021.1831

岩土力学 ›› 2022, Vol. 43 ›› Issue (8): 2305-2316.doi: 10.16285/j.rsm.2021.1831

考虑优势流作用的降雨入渗边坡可靠度分析

姚云琦^{1, 2}，曾润强^{1, 2}，马建花^{2, 3}，孟祥沛^{1, 2}，王鸿^{1, 2}，张宗林^{1, 2}，孟兴民^{1, 2}

1. 兰州大学地质科学与矿产资源学院，甘肃兰州 730000；2. 兰州大学甘肃省环境地质与灾害防治技术创新中心，甘肃兰州 730000； 3. 兰州大学资源环境学院，甘肃兰州 730000

收稿日期:2021-11-01 修回日期:2022-01-21 出版日期:2022-08-11 发布日期:2022-08-19
通讯作者: 曾润强，男，1987年生，博士，讲师，主要从事环境遥感与地质灾害、黄土滑坡的研究工作。E-mail: zengrq@lzu.edu.cn E-mail:yaoyq19@lzu.edu.cn
作者简介:姚云琦，男，1997年生，硕士研究生，主要从事边坡稳定性评价、黄土滑坡的学习与研究。
基金资助:
国家重点研发计划（No.2018YFC1504704）；国家自然科学基金青年基金项目（No.41602348）；甘肃省技术创新中心建设资助项目（No.18JR2JA006）；中央高校基本科研业务费专项资金（No.lzujbky-2021-sp01)。

Reliability analysis of slope under rainfall infiltration considering preferential flow model

YAO Yun-qi^{1, 2}, ZENG Run-qiang^{1, 2}, MA Jian-hua^{2, 3}, MENG Xiang-pei^{1, 2}, WANG Hong^{1, 2}, ZHANG Zong-lin^{1, 2}, MENG Xing-min^{1, 2}

1.School of Earth Sciences, Lanzhou University, Lanzhou, Gansu 730000, China; 2. Technology & Innovation Center for Environmental Geology and Geohazards Prevention of Gansu Province, Lanzhou University, Lanzhou, Gansu 730000, China; 3. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Gansu 730000, China

Received:2021-11-01 Revised:2022-01-21 Online:2022-08-11 Published:2022-08-19
Supported by:
This work was supported by the National Key R&D Program of China (2018YFC1504704), the Youth Scholars of National Natural Science Foundation of China (41602348), the Construction Project of Gansu Technological Innovation Center(18JR2JA006) and the Fundamental Research Funds for the Central Universities (lzujbky-2021-sp01).

摘要/Abstract

摘要： 降雨诱发滑坡是世界上最普遍的地质灾害，而关于降雨入渗对边坡的可靠度分析，优势入渗的影响被长期忽视。使用Comsol Multiphysics对降雨条件下优势入渗做数值求解，利用无限边坡模型计算边坡安全系数；并应用改进Cholesky分解法生成空间相关随机场，使用蒙特卡洛方法分析降雨过程中边坡的可靠度。结合确定性与可靠度计算对比均质入渗与优势入渗在降雨过程中边坡安全性变化：（1）降雨强度较低时，优势入渗安全性较好，而降雨强度较高时，均质入渗更稳定；（2）均质入渗中参数空间变异性是边坡失稳破坏的关键因素，而优势入渗的边坡失稳则由湿润峰快速推进所导致；（3）针对优势入渗模型研究，发现基质域与优势域水力交换强度较大时边坡有更大概率失稳，而较小的水力交换强度可能影响边坡底部的失稳破坏。

关键词: 无限边坡模型, 降雨入渗, 双重渗透模型, 边坡可靠度, 蒙特卡洛模拟

Abstract: Rainfall-induced landslides are the most common geological hazard in the world, and the effect of preferential flow infiltration has been neglected for a long time regarding the slope reliability analysis under rainfall infiltration. The preferential infiltration under rainfall conditions is solved numerically by Comsol Multiphysics, and the slope factor of safety is calculated using an infinite slope model. An improved Cholesky decomposition method is applied to generate spatially correlated random fields, and the slope reliability during rainfall is analyzed using the Monte Carlo method. Combining the deterministic and reliability results to compare the variation of slope factor of safety between the homogeneous infiltration and the preferential infiltration during rainfall, it can be found that: (1) the preferential infiltration model is safer when the rainfall intensity is low, while the homogeneous infiltration is more stable at higher rainfall intensity; (2) the spatial variability of infiltration parameters is the crucial factor of slope failure in homogeneous infiltration, while the slope instability of preferential infiltration is mainly caused by the rapid advance of the wetting front; (3) for the study of preferential infiltration model, the slope has a higher probability of failure when the hydraulic exchange intensity between the matrix domain and the preferential domain, while smaller hydraulic exchange intensity may affect the slope failure at the bottom.

Key words: infinite slope model, rainfall infiltration, double permeability model, slope reliability, Monte Carlo simulation

中图分类号: TU 43

姚云琦, 曾润强, 马建花, 孟祥沛, 王鸿, 张宗林, 孟兴民, . 考虑优势流作用的降雨入渗边坡可靠度分析[J]. 岩土力学, 2022, 43(8): 2305-2316.

YAO Yun-qi, ZENG Run-qiang, MA Jian-hua, MENG Xiang-pei, WANG Hong, ZHANG Zong-lin, MENG Xing-min, . Reliability analysis of slope under rainfall infiltration considering preferential flow model[J]. Rock and Soil Mechanics, 2022, 43(8): 2305-2316.

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考虑优势流作用的降雨入渗边坡可靠度分析

Reliability analysis of slope under rainfall infiltration considering preferential flow model

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