| 三峡库区大型-特大型层状岩质滑坡成因模式及地质特征分析 |
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| 引用本文： | 朱冬雪,许强,李松林.三峡库区大型-特大型层状岩质滑坡成因模式及地质特征分析[J].地质科技通报,2020,39(2):158-167. |
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| 作者姓名： | 朱冬雪 许强 李松林 |
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| 作者单位： | 成都理工大学地质灾害防治与地质环境保护国家重点实验室 |
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| 基金项目： | 国家自然科学基金重点项目41630640国家创新研究群体科学基金基金项目41521002 |
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| 摘 要： | 三峡库区大型-特大型滑坡发育,尤以层状岩质滑坡的危害性大。因库区各段地质条件差异使得滑坡成因模式各不相同,这影响了滑坡的运动形式和岩土体解体程度。在收集三峡库区51处典型的大型-特大型层状岩质滑坡调查资料基础上,根据堆积岩体结构和区段地质条件反推该段滑坡破坏成因模式,而不同成因模式下的滑坡坡体渗透性不同,分析已有滑坡对库水位变动存在的复活响应差异,据此得出以下结论:①在成因模式上,除顺层滑移型滑坡在库区中均有分布外,从库首至库尾随着岩层倾角的逐渐减缓,滑坡成因模式从崩塌型、反倾弯曲型逐渐过渡到平推式;②在坡体渗透性上,成因模式造成的岩体结构变化与坡体中的泥质含量共同作用,导致顺层滑移型滑坡前后缘渗透性存在较大差异;反倾型滑坡渗透性则整体变化较小;③在库水位变动影响下,不同坡体渗透性与滑面形态共同决定了滑坡的复活变形差异。
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| 关 键 词： | 滑坡 三峡库区 成因模式 岩体结构 渗透性 |
| 收稿时间： | 2019-05-14 |
Genetic types and geological features of large scale and extra-large scale layered landslides in the Three Gorges Reservoir area |
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| Zhu Dongxue,Xu Qiang,Li Songlin.Genetic types and geological features of large scale and extra-large scale layered landslides in the Three Gorges Reservoir area[J].Bulletin of Geological Science and Technology,2020,39(2):158-167. |
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| Authors: | Zhu Dongxue Xu Qiang Li Songlin |
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| Affiliation: | (State Key Laboratory of Geohazards Prevention and Geoenviroment Protection,Chengdu University of Technology,Chengdu 610059,China) |
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| Abstract: | The large-scale and extra-large scale landslides in the Three Gorges Reservoir area have a great impact on the rock landslides. The geological conditions in various sections of the reservoir make the landslide genesis patterns different, resulting in different forms of motion after the damage and the degree of disintegration of the rock masses. With 51 typical large scale or extra-large scale bedrock landslide data collected in the Three Gorges Reservoir area, the cause model of the landslide failure is reversed according to the structure of the stacked rock masses and the geological conditions. The landslides with different genetic models have different permeability characteristics and resurrection responses to reservoir water level changes. The results show that from the head to the tail of the reservoir, along with the decreasing of the rock dips, in addition to the distribution of the full-slide type, the genetic types gradually change from collapse type and anti-tilt type to translation type. In the permeability of the slope, the change of rock mass structure caused by the genetic model and the shale content in the slope body result in a large difference in the permeability of the front and rear edges of the bedding landslide. But the anti-dipping landslides are the opposite, and under the influence of reservoir water fluctuations, the permeability of different slopes and the shape of the slip surface jointly determine the difference of resurrection deformation of the landslides. |
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| Keywords: | landslide Three Gorges Reservoir area genetic type rock mass structure permeability |
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