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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第47卷

期数:

2025年第03期

页码:

331-343

栏目:

黄河流域生态保护和高质量发展专刊(上)

出版日期:

2025-05-15

文章信息/Info

Title:

Deformation Law and Stability Prediction of Dongjiatun Landslides Under Rainfall During Various Recurrence Periods in Yan'an Area of Shaanxi, China

文章编号:

1672-6561(2025)03-0331-13

作者:

孙林煊¹; 邓龙胜¹; 2*; 汤 冬¹; 陈家乐¹; 沈舒瀚¹; 齐东鸿¹; 张文杰¹; 王 童¹

(1.长安大学 地质工程与测绘学院,陕西 西安 710054; 2.长安大学 地质灾害成因机理与风险防控陕西省高等学校重点实验室,陕西 西安 710054)

Author(s):

SUN Lin-xuan¹;  DENG Long-sheng¹; 2*;  TANG Dong¹;  CHEN Jia-le¹;  SHEN Shu-han¹;  QI Dong-hong¹;  ZHANG Wen-jie¹;  WANG Tong¹

(1.School of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,Shaanxi,China; 2.Key Laboratory of Geological Hazards Mechanism and Risk Control of Shaanxi Higher Education Institutes,Chang'an University,Xi'an 710054,Shaanxi,China)

关键词:

黄土滑坡;  数值模拟;  降雨入渗;  变形规律;  稳定性;  破坏模式;  陕西

Keywords:

loess landslide;  numerical simulation;  rainfall infiltration;  deformation law;  stability;  damage pattern;  Shaanxi

分类号:

P642.22

DOI:

10.19814/j.jese.2025.03020

文献标志码:

A

摘要:

近年来,黄土高原由极端降雨事件诱发的地质灾害数量越来越多,严重威胁经济建设和社会发展。以陕西延安地区董家屯滑坡为研究对象,通过野外调查、现场钻探、室内试验、数值模拟等方法,研究了不同重现期降雨作用下董家屯滑坡的渗流场、变形特征,分析了滑坡稳定性变化规律和变形破坏模式。结果表明:①董家屯滑坡不同重现期对应超越概率10.00%、5.00%、2.00%、1.00%、0.10%、0.01%降雨作用下的降雨量预测值分别为92.15、103.82、118.10、128.40、157.78、186.51 mm·d^-1; ②董家屯滑坡坡体浸润范围和孔隙水压力随着降雨强度的增大而增大,但增幅较小; 降雨作用下,在坡体古土壤层顶部和节理裂隙尖端产生了明显的滞水效应,成为变形和控滑的重要界面; 坡体稳定性随着降雨强度和持续时间的增大而减小,当遭遇超越概率1.00%降雨作用时,降雨24 h后,坡体将处于不稳定状态; ③降雨作用下,董家屯滑坡坡体的渗流场受坡面流、均匀入渗和节理裂隙优先入渗共同影响; 坡体在浅表层均匀入渗及坡面流共同作用下,可能发生浅表侵蚀流滑破坏; 在节理裂隙优先入渗及古土壤滞水效应影响下,坡体可能发生深层剪切滑移破坏。

Abstract:

In recent years, extreme rainfall events have become increasingly frequent in Loess Plateau, leading to a growing trend in the quantity of induced geological disasters, seriously threatening economic construction and social development. Dongjiatun landslide in Yan'an area of Shaanxi was taken as the research subject; through field investigations, on-site drilling, laboratory tests, and numerical simulations, the seepage field, deformation, stability and damage pattern of the landslide under rainfall during various recurrence periods were investigated. The results show that ① the predicted precipitations corresponding to the exceedance probabilities of 10.00%, 5.00%, 2.00%, 1.00%, 0.10% and 0.01% during various recurrence periods of rainfall in Dongjiatun landslide are 92.15, 103.82, 118.10, 128.40, 157.78, and 186.51 mm·d^-1, respectively; ② the saturation range and pore water pressure in Dongjiatun landslide increase marginally with rainfall intensity; significant water retention effects occur at the top of paleosol layers and joint fissure tips, forming critical interfaces for slope deformation and sliding; slope stability declines with the incease of rainfall intensity and duration; the slope enters a unstable state when subjects to 24 h rainfall with an exceedance probability of 1.00%; ③ the seepage field is jointly influenced by surface runoff, uniform infiltration, and preferential flow through joints; shallow erosion-sliding may result from combined surface runoff and uniform infiltration, while deep shear sliding could occur due to joint-controlled preferential flow and paleosol water retention effects.

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备注/Memo

备注/Memo:

收稿日期:2025-03-17; 修回日期:2025-05-06
基金项目:国家重点研发计划项目(2022YFC3003403); 国家自然科学基金项目(42472348,42220104005)
*通信作者:邓龙胜(1981-),男,云南镇雄人,教授,博士研究生导师,工学博士,E-mail:dlsh@chd.edu.cn。

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