西藏山南鲁麦古滑坡发育特征与复活变形机制研究

P642.22; 青藏高原地质条件复杂,历史上形成了大量古滑坡,近年来在极端天气和人类工程活动影响下,古滑坡复活变形呈加剧趋势,潜在危害严重.文章以西藏山南鲁麦古滑坡作为研究对象,利用野外地质调查、无人机测绘、数值模拟等技术方法,在剖析其变形特征的基础上,分析了古滑坡复活的影响因素,探究了地表水入渗与堆载作用下古滑坡复活失稳机制.研究结果表明:鲁麦古滑坡体积为2.5×106～15.1×106m3,前缘剪出口与坡脚的当许雄曲最大高差超过200 m,最深层的滑带位于基岩与堆积体间的接触面;受地表水入渗与堆载作用影响,古滑坡复活变形目前集中分布在堆积区前部,地表发育大量地表裂缝和下错陡坎;在地表水集...

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Published in中国地质灾害与防治学报 Vol. 35; no. 5; pp. 32 - 41
Main Authors 马海善, 吴瑞安, 赵文博, 王计博, 齐畅, 邓盼, 李英钧
Format Journal Article
LanguageChinese
Published 青海省环境地质勘查局,青海西宁 810000 01.10.2024
自然资源部活动构造与地质安全重点实验室,北京 100081%中国地质科学院地质力学研究所,北京 100081%安徽省地质矿产勘查局332地质队,安徽黄山 245000
青海省环境地质重点实验室,青海西宁 810000
青海省地质环境保护与灾害防治工程技术研究中心,青海西宁 810000%中国地质科学院地质力学研究所,北京 100081
Subjects
Tibetan Plateau
发育特征
ancient landslide
稳定性分析
青藏高原
stability analysis
developmental characteristic
复活机制
古滑坡
reactivation mechanism
Online AccessGet full text
ISSN1003-8035
DOI10.16031/j.cnki.issn.1003-8035.202403013

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Abstract P642.22; 青藏高原地质条件复杂,历史上形成了大量古滑坡,近年来在极端天气和人类工程活动影响下,古滑坡复活变形呈加剧趋势,潜在危害严重.文章以西藏山南鲁麦古滑坡作为研究对象,利用野外地质调查、无人机测绘、数值模拟等技术方法,在剖析其变形特征的基础上,分析了古滑坡复活的影响因素,探究了地表水入渗与堆载作用下古滑坡复活失稳机制.研究结果表明:鲁麦古滑坡体积为2.5×106～15.1×106m3,前缘剪出口与坡脚的当许雄曲最大高差超过200 m,最深层的滑带位于基岩与堆积体间的接触面;受地表水入渗与堆载作用影响,古滑坡复活变形目前集中分布在堆积区前部,地表发育大量地表裂缝和下错陡坎;在地表水集中人渗影响下,滑坡前缘表层岩土体多次发生局部滑动;前缘堆载增加后,滑坡前部的形变整体增加,并呈高位剪出的趋势.研究成果对深化西藏山南地区古滑坡复活机理和支撑当地防灾减灾工作具有一定意义.
AbstractList P642.22; 青藏高原地质条件复杂,历史上形成了大量古滑坡,近年来在极端天气和人类工程活动影响下,古滑坡复活变形呈加剧趋势,潜在危害严重.文章以西藏山南鲁麦古滑坡作为研究对象,利用野外地质调查、无人机测绘、数值模拟等技术方法,在剖析其变形特征的基础上,分析了古滑坡复活的影响因素,探究了地表水入渗与堆载作用下古滑坡复活失稳机制.研究结果表明:鲁麦古滑坡体积为2.5×106～15.1×106m3,前缘剪出口与坡脚的当许雄曲最大高差超过200 m,最深层的滑带位于基岩与堆积体间的接触面;受地表水入渗与堆载作用影响,古滑坡复活变形目前集中分布在堆积区前部,地表发育大量地表裂缝和下错陡坎;在地表水集中人渗影响下,滑坡前缘表层岩土体多次发生局部滑动;前缘堆载增加后,滑坡前部的形变整体增加,并呈高位剪出的趋势.研究成果对深化西藏山南地区古滑坡复活机理和支撑当地防灾减灾工作具有一定意义.
Abstract_FL The complex geological conditions of the Tibetan Plateau have historically fostered the development of numerous ancient landslides.In recent years,the reactivation of these landslides has exhibited a concerning escalation,driven by extreme weather events and human activities,thereby posing significant hazards.This study examines the Lumai ancient landslide in Shannan City,Xizang,employing a combination of field geological investigation,drone mapping,numerical simulation,and other technical methodologies.The research focuses on analysing the reactivation characteristics and influencing factors,specifically investigating the reactivation mechanism of the ancient landslide under the effects of surface water infiltration and loading.The results indicate that the Lumai ancient landslide has a volume of 2.5×106 to 15.1×106 m3.The maximum height difference between the landslide's leading edge shear outlet and the Dangxuxiongqu River at the slope foot exceeds 200 meters,with the deepest sliding zone located at the interface between bedrock and loose deposits.Deformation is primarily concentrated in the front part of the landslide's accumulation zone,characterized by numerous cracks and steep scarps.The reactivation is significantly influenced by surface water infiltration and overloading.Under concentrated water infiltration,localized sliding frequently occurs at the landslide front.Additionally,increased loading at the front leads to overall deformation and a tendency toward high-position shear failure.These findings enhance the understanding of reactivation mechanisms for ancient landslides in the Shannan City,Xizang,and provide valuable insights for local disaster prevention and mitigation efforts.
Author 李英钧
吴瑞安
王计博
齐畅
赵文博
马海善
邓盼
AuthorAffiliation 青海省环境地质勘查局,青海西宁 810000;青海省环境地质重点实验室,青海西宁 810000;青海省地质环境保护与灾害防治工程技术研究中心,青海西宁 810000%中国地质科学院地质力学研究所,北京 100081;自然资源部活动构造与地质安全重点实验室,北京 100081%中国地质科学院地质力学研究所,北京 100081%安徽省地质矿产勘查局332地质队,安徽黄山 245000
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Author_FL MA Haishan
ZHAO Wenbo
DENG Pan
WANG Jibo
LI Yingjun
WU Ruian
QI Chang
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DocumentTitle_FL Development characteristics and reactivation deformation mechanism of the Lumai landslide in Shannan City,Xizang
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Keywords Tibetan Plateau
发育特征
ancient landslide
稳定性分析
青藏高原
stability analysis
developmental characteristic
复活机制
古滑坡
reactivation mechanism
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PublicationTitle 中国地质灾害与防治学报
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PublicationYear 2024
Publisher 青海省环境地质勘查局,青海西宁 810000
自然资源部活动构造与地质安全重点实验室,北京 100081%中国地质科学院地质力学研究所,北京 100081%安徽省地质矿产勘查局332地质队,安徽黄山 245000
青海省环境地质重点实验室,青海西宁 810000
青海省地质环境保护与灾害防治工程技术研究中心,青海西宁 810000%中国地质科学院地质力学研究所,北京 100081
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Snippet P642.22; 青藏高原地质条件复杂,历史上形成了大量古滑坡,近年来在极端天气和人类工程活动影响下,古滑坡复活变形呈加剧趋势,潜在危害严重.文章以西藏山南鲁麦古滑坡作为研...
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Title 西藏山南鲁麦古滑坡发育特征与复活变形机制研究
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