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现代地质 ›› 2021, Vol. 35 ›› Issue (01): 145-152.DOI: 10.19657/j.geoscience.1000-8527.2021.007

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川西雅江地区构造-岩石变形特征及其控灾机制

熊小辉1,2(), 白永健1(), 铁永波1   

  1. 1. 中国地质调查局 成都地质调查中心,四川 成都 610081
    2. 自然资源部沉积盆地与油气资源重点实验室,四川 成都 610081
  • 收稿日期:2020-08-09 修回日期:2020-12-08 出版日期:2021-02-12 发布日期:2021-03-12
  • 通讯作者: 白永健
  • 作者简介:白永健,男,高级工程师,博士研究生,1982年出生,地质工程专业,主要从事区域地质灾害调查与研究工作。Email: byj@126.com
    熊小辉,男,博士,1987年出生,古生物学与地层学专业,主要从事基础地质与区域地质灾害方面研究工作。Email: xiongxiaohui1987@163.com
  • 基金资助:
    中国地质调查局项目(DD20190640);中国地质调查局项目(20190505);国家自然科学基金项目(41772324);国家自然科学基金项目(41702374);国家科技重点研发计划项目(2018YFC1505406)

Geological Structure and Rock Deformation Characteristics and Their Geohazard-Controlling Mechanism in Yajiang Area, West Sichuan

XIONG Xiaohui1,2(), BAI Yongjian1(), TIE Yongbo1   

  1. 1. Chengdu Center, China Geological Survey, Chengdu, Sichuan 610081, China
    2. Key Laboratory of Sedimentary Basin and Oil and Gas Resources, Ministry of Natural Resources, Chengdu, Sichuan 610081, China
  • Received:2020-08-09 Revised:2020-12-08 Online:2021-02-12 Published:2021-03-12
  • Contact: BAI Yongjian

摘要:

川西雅江地区发育系列复式背斜、复式向斜及其伴生断裂的褶-断式构造组合样式。受强烈构造改造,岩石变形主要呈现出柔性滑脱、顺层剪切、脆性弯折、沿结构面强卸荷、大位移错动、断层破碎以及褶皱劈理化等7类样式。构造-岩石组合塑造着该区域雅砻江展布与深切河谷的演化,而河谷演化与构造改造共同控制着区域滑坡、崩塌等地质灾害的发育与分布。不同的岩石变形样式孕育不同类型的地质灾害,而岩性组合关系控制地质灾害发育的规模。受砂岩板岩互层弯折变形的控制,斜坡主要产生倾倒弯折→拉裂→滑移→失稳破坏→堵塞河道或阻断道路等多阶段变形破坏模式,形成雅江地区滑坡灾害最主要的成灾模式。

关键词: 雅江地区, 地质构造, 岩石变形, 地灾分布, 控灾机制

Abstract:

Structural patterns of compound anticlines and synclines with faults superimposed are widely developed in Yajiang area, west Sichuan. Due to intensive tectonic reworking, at least seven rock deformation types present in the study area, including flexible slippage, bedding shear, brittle bending, unloading along structural planes, large-scale dislocation, fault fracture and fold cleavage. Structural-lithologic assemblage has shaped the distribution of Yalong river and valley evolution. Meanwhile, the development and distribution of geohazards, e.g., landslides and collapses, and their stability and risk are controlled by valley evolution and tectonic reworking. The different of geohazard types are controlled by various rock deformation types, and the lithologic association has constrained their size. Interbedded sand-slate controlled by brittle bending has often experienced toppling-drawing breakage-slippage-unstable failure-river blockage, and the multistage slope evolution represents the main geohazard model in Yajiang area.

Key words: Yajiang area, geological structure, rock deformation, geohazard distribution, geohazard-controlling mechanism

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