三峡库区白杨湾含多级软弱滑带滑坡变形特征与成因机制分析

doi:10.11988/ckyyb.20211077

院报 ›› 2023, Vol. 40 ›› Issue (3): 143-150.DOI: 10.11988/ckyyb.20211077

三峡库区白杨湾含多级软弱滑带滑坡变形特征与成因机制分析

袁旭凯^1,2, 罗丹^3,4, 许万忠¹, 杨长明⁴, 蒋朝兴¹

1.昆明理工大学国土资源工程学院,昆明 650093;
2.重庆大学土木工程学院,重庆 400044;
3.四川省亭子口灌区建设开发有限公司,四川南充 637000;
4.重庆市地勘局 208 水文地质工程地质队,重庆 400700

收稿日期:2021-10-12 修回日期:2021-12-28 出版日期:2023-03-01 发布日期:2023-03-28
通讯作者: 许万忠(1965-),男,黑龙江海林人,教授,博士,研究方向为岩土工程、地质工程与地质灾害防治。E-mail:582647881@qq.com
作者简介:袁旭凯(1995-),男,山西大同人,硕士研究生,研究方向为边坡工程、地质灾害防治。E-mail:943081726@qq.com
基金资助:
国家自然科学基金项目(41562016)

Deformation Characteristics and Formation Mechanism of Baiyang Bay Landslide Containing Multistage Weak Slip Zones in Three Gorges Reservoir Area

YUAN Xu-kai^1,2, LUO Dan^3,4, XU Wan-zhong¹, YANG Chang-ming⁴, JIANG Chao-xing¹

1. Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. School of Civil Engineering, Chongqing University,Chongqing 400044, China;
3. Sichuan TingzikouIrrigation District Construction and Development Co., Ltd., Nanchong 637000, China;
4. HydrogeologyEngineering Geology Team 208 of Chongqing Geological Exploration Bureau, Chongqing 400700, China

Received:2021-10-12 Revised:2021-12-28 Online:2023-03-01 Published:2023-03-28

摘要/Abstract

摘要： 三峡库区白杨湾滑坡是典型的含多级软弱滑带的滑坡,通过航拍和现场勘查,采用钻探、物探、位移监测、数值模拟相结合的手段,查明了滑坡变形特征和多级滑带的位置, 滑坡的形成和发展受外部诱发因素与内部地质条件共同控制。钻探和物探解译揭示该滑坡为包含软弱夹层和多级滑带的深层岩土混合滑坡,分为2个滑动带。地表变形特征及位移监测表明滑坡中前部变形量相对较大,日变形量1.3~4.0 mm,处于均速变形状态,深部位移曲线显示有两处凸起位移突变点,主、次滑面特征明显,与钻孔勘探结果相互印证。数值模拟结果反映出,该滑坡在现状工况下处于欠稳定状态,在暴雨工况下滑坡安全系数显著降低,处于不稳定状态。滑坡区的地形地貌、地质构造、地层岩性为滑坡的形成提供了物源和场地条件,人类工程活动和降雨加剧了滑坡的变形。

关键词: 白杨湾滑坡, 多级滑带, 变形特征, 成因机制, 三峡库区

Abstract: The Baiyang bay landslide in the Three Gorges Reservoir area is a typical landslide with multistage weak slip zones. Through aerial photography and site surveys, we identified the deformation characteristics of the landslide and the location of the multistage slip zone by drilling, geophysical prospecting, displacement monitoring, and numerical simulation. The formation and development of the landslide are controlled by external inducing factors and internal geological conditions. Drilling and geophysical interpretation manifest that the landslide is a deep-seated rock-soil mixed landslide with multi-level slip zones with weak interlayers, divided into two sliding zones. Surface deformation and displacement monitoring reveal large deformation in the middle and front part of the landslide, with the daily deformation reaching 1.3-4.0 mm uniformly. The deep displacement curve shows two abrupt change points of bulge displacement with notable characteristics of primary and secondary sliding surfaces, which is verified by survey data. Moreover, numerical simulation results reflect that the landslide is in an under-stable state under current working conditions; in particular, the safety factor of the landslide under heavy rain condition declines remarkably, indicating an unstable state. The topography, geomorphology, geological structure, and stratum lithology of the landslide provide the source and site conditions for the formation of the landslide. Human engineering activities and rainfall have also exacerbated the deformation of the landslide.

Key words: Baiyang bay landslide, multistage slip zone, deformation characteristics, formation mechanism, Three Gorges Reservoir area

中图分类号:

P642.2

袁旭凯, 罗丹, 许万忠, 杨长明, 蒋朝兴. 三峡库区白杨湾含多级软弱滑带滑坡变形特征与成因机制分析[J]. 院报, 2023, 40(3): 143-150.

YUAN Xu-kai, LUO Dan, XU Wan-zhong, YANG Chang-ming, JIANG Chao-xing. Deformation Characteristics and Formation Mechanism of Baiyang Bay Landslide Containing Multistage Weak Slip Zones in Three Gorges Reservoir Area[J]. Journal of Yangtze River Scientific Research Institute, 2023, 40(3): 143-150.

[1]	方强, 张奇华, 朱焕春, 李杨, 吴述彧. 如美水电站坝址区碎裂松动岩体成因机制[J]. 院报, 2024, 41(1): 159-166.
[2]	李佳文, 周育琳, 魏兴, 范祖金. CMIP6对三峡库区万州段降水和气温的模拟能力评估[J]. 院报, 2023, 40(7): 32-40.
[3]	林娜, 张迪, 潘建平, 冯珊珊, 潘鹏. 长寿区长时序生态质量评价及影响因素分析[J]. 院报, 2023, 40(11): 56-62.
[4]	赵子皓, 江晓东, 杨沈斌. 三峡蓄水对局地气候变化的影响[J]. 院报, 2022, 39(6): 40-49.
[5]	王尚晓, 李士垚, 牛瑞卿. 木鱼包滑坡形变特征的InSAR监测分析[J]. 院报, 2022, 39(4): 77-84.
[6]	王璐, 魏俞杰, 唐时美, 阚子威. 加卸荷条件下大理岩变形特征及能量演化[J]. 院报, 2022, 39(3): 125-130.
[7]	袁兴中. 三峡库区澎溪河消落带生态系统修复实践探索[J]. 院报, 2022, 39(1): 1-9.
[8]	娄连惠, 刘强, 谭玉敏. 基于时间序列InSAR的巴东地表形变分析[J]. 院报, 2021, 38(5): 149-152.
[9]	张富灵, 邓茂林, 周剑, 李卓骏, 林琰. 长江三峡库区谭家湾滑坡基本变形特征及机理分析[J]. 院报, 2021, 38(1): 78-83.
[10]	武金博, 吴庆华. 三峡库区黄土坡滑带空隙结构与渗流特性[J]. 院报, 2020, 37(9): 102-109.
[11]	李长安. 基于地貌过程的滑坡系统分析——以三峡库区为例[J]. 院报, 2020, 37(6): 1-7.
[12]	雷俊安, 杨俊. 二灰稳定三峡库区风化砂三轴试验研究[J]. 院报, 2019, 36(3): 133-138.
[13]	卢程伟, 周建中, 胡德超, 张余龙. 三峡库区枝状河网水动力过程实时模拟[J]. 院报, 2018, 35(5): 153-156.
[14]	王晨玺杰, 邓华锋, 张恒宾, 方景成, 肖瑶. 考虑劣化效应的三峡库区某岸坡抗震性能分析[J]. 院报, 2018, 35(1): 112-116.
[15]	吴翠, 牛瑞卿, 孙平. 三峡库区巫山—奉节段生态环境敏感性分析[J]. 院报, 2017, 34(9): 29-35.

三峡库区白杨湾含多级软弱滑带滑坡变形特征与成因机制分析

Deformation Characteristics and Formation Mechanism of Baiyang Bay Landslide Containing Multistage Weak Slip Zones in Three Gorges Reservoir Area

PDF

可视化

摘要/Abstract

引用本文

使用本文

相关文章 15

编辑推荐

Metrics

本文评价