基于滑坡破坏模式分析的易发性评价

朱宇航; 黄海峰; 殷坤龙; 郭子正; 郭飞; 赖鹏

doi:10.16031/j.cnki.issn.1003-8035.202112035

基于滑坡破坏模式分析的易发性评价

doi: 10.16031/j.cnki.issn.1003-8035.202112035

朱宇航^1,,
黄海峰^{2, 3, ,},
殷坤龙¹,
郭子正⁴,
郭飞^{2, 3},
赖鹏^{2, 3}

1.
中国地质大学（武汉）工程学院，湖北武汉　430074
2.
三峡大学湖北长江三峡滑坡国家野外科学观测研究站，湖北宜昌　443000
3.
三峡大学土木与建筑学院，湖北宜昌　443002
4.
河北工业大学土木与交通学院，天津　300401

基金项目: 国家自然科学基金项目（42107489）；水电工程智能视觉监测湖北省重点实验室开放基金项目（2020SDSJ02）；三峡库区地质灾害教育部重点实验室开放基金项目（2020KDZ09）

详细信息

作者简介:
朱宇航（1999-），男，硕士，主要从事地质灾害风险评价方面的研究工作。E-mail：cugzyh@cug.edu.cn

通讯作者:
黄海峰（1978-），男，博士，教授，主要从事地质灾害监测防治等方面的教学与科研工作。E-mail：hhf@ctgu.edu.cn

中图分类号: P642.22
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出版历程
- 收稿日期: 2021-12-28
- 录用日期: 2022-04-08
- 修回日期: 2022-04-06
- 网络出版日期: 2023-02-20
- 刊出日期: 2023-04-25

Evaluation of landslide susceptibility based on landslide failure mode analysis: A case study of the left bank of Xietan River in the first section of Three Gorges Reservoir

Yuhang ZHU^1
,,
Haifeng HUANG^{2, 3
, ,},
Kunlong YIN¹,
Zizheng GUO⁴,
Fei GUO^{2, 3},
Peng LAI^{2, 3}

1.
Faculty of Engineering, China University of Geosciences（Wuhan）, Wuhan, Hubei　430074, China
2.
National Field Observation and Research Station of Landslides in the Three Gorges Reservoir Area of Yangtze River, China Three Gorges University, Yichang, Hubei　443000, China
3.
College of Civil Engineering & Architecture, China Three Gorges University, Yichang, Hubei　443002, China
4.
School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin　300401, China

摘要

摘要: 三峡库区首段发育有大量岩质滑坡，其中很多灾害点极具隐蔽性且目前并未被查明。文中以三峡库区首段泄滩河左岸为研究区，以区内唯一破坏的卡门子湾顺层岩质滑坡为例，在分析其成因机制的基础上归纳总结了该地区顺层岩质滑坡的破坏模式，并以此确定了高程、坡度、坡向、起伏度、平面曲率、剖面曲率、地层岩性、距河流距离及距道路距离共9个评价指标因子及疑似滑坡隐患点，将这些灾害隐患点作为滑坡样本，运用ALSA模型开展研究区的滑坡易发性分区，最后采用ROC曲线及现场复查等方法验证评价结果的可靠性。预测结果表明：研究区内顺层岩质滑坡的极高易发区和较高易发区大致呈面状分布，主要集中在岩性为侏罗系中统上沙溪庙组紫红色泥岩夹砂岩和西北坡向的近库岸地区。现场验证发现易发分区结果与滑坡破坏模式分布规律较吻合，表明基于滑坡破坏模式选择滑坡样本得到的滑坡易发性结果在整体上也能反映研究区滑坡概率空间分布规律，在缺乏准确滑坡样本时可作为一种替补方案。上述研究结果为基于滑坡破坏模式选取滑坡样本开展易发性评价工作提供了理论支持和科学依据。
- ALSA模型 /
- 滑坡易发性 /
- 三峡库区 /
- 滑坡样本
Abstract: There are a large number of rock landslide disasters developed in the first section of the Three Gorges Reservoir area, many of which are very hidden and have not been identified. In this paper, taking the left bank of Xietan River in the first section of the Three Gorges Reservoir as the study area, taking the only bedding rock landslide in Kamenziwan as an example, the failure mode of bedding rock landslide in this area is summarized on the basis of analyzing its genesis mechanism. Nine evaluation index factors, including elevation, slope aspect, slope, relief, plane curvature, profile curvature, formation lithology, distance from river and distance from road, as well as suspected hidden danger points of landslide disaster are determined. These hidden danger points are taken as landslide samples. Automatic Landside Susceptibility Assessment Model (ALSA) was used to carry out landslide Susceptibility zoning in the study area. Finally, ROC curve and field review were used to verify the reliability of the evaluation results. The prediction results show that the extremely high and highly prone areas of bedding rock landslides in the study area are distributed in a plane shape, mainly concentrated in the middle Jurassic Upper Shaximiao Formation purplish red mudstone intercalated sandstone, and the northwest slope direction near the reservoir bank area. Field verification shows that the results of prone zoning are consistent with the distribution law of landslide failure mode, indicating that the landslide susceptibility results obtained by selecting landslide samples based on landslide failure mode can also reflect the spatial distribution law of landslide probability in the study area on the whole, and can be used as a substitute scheme in the absence of accurate landslide samples. The above research results provide theoretical support and scientific basis for selecting landslide samples to carry out vulnerability assessment based on landslide failure mode.
- ALSA model /
- landslide susceptibility assessment /
- Three Gorges Reservoir area /
- landslide samples

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图 1 研究区位置图

Figure 1. Location map of the study area

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图 2 泄滩河左岸现场调查图（摄于2020年8月）

Figure 2. Field geotechnical photo of the left bank of Xietan River (August 2020)

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图 3 卡门子湾滑坡全貌及优势结构面

Figure 3. Arial view and dominant structural plane of Kamenziwan landslide

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图 4 卡门子湾滑坡结构面赤平投影

Figure 4. Equated projection of Kamenziwan landslide section

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图 5 卡门子湾滑坡破坏前后库水位和降雨量

Figure 5. Summery of reservoir water level and rainfall before and after Kamenziwan landslide failure

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图 6 卡门子湾滑坡破坏模式概化示意图

Figure 6. Generalized schematic diagram of failure mode of Kamenziwan landslide

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图 7 泄滩河北段粉砂岩山脊夹泥岩沟谷微地貌示意图

Figure 7. The terrain and watershed partition of siltstone ridge and mudstone valley in Xietan River north section

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图 8 易发性评价指标图层

Figure 8. Layer of susceptibility assessment index

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图 9 疑似滑坡区为训练样本的滑坡易发性分区图

Figure 9. Distribution map of landslide susceptibility area

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图 10 易发性结果ROC曲线

Figure 10. ROC curve of susceptibility results

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图 11 现场验证位置及照片（摄于2021年1月）

Figure 11. Field review verification photos （January 2021）

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表 1 卡门子湾滑坡破坏模式总结表

Table 1. Summary table of failure mode of Kamenziwan landslide

岸坡类型		缓倾切向坡
破坏模式		视倾向顺层牵引式滑坡
孕灾（六面体）结构面	斜坡表面	“上陡下缓前临空”的台阶状折线地形
	底部滑带	左侧顺层，右侧切层
	前缘剪出口	河流冲刷侵蚀形成临空面，剪出口高程在145～175 m
	后缘边界	一组陡倾结构面切割，出露岩层切面
	左侧边界	多组结构面相互切割形成阶梯状边界
	右侧边界	岩层面
	边界特征	两个约束边界（右、后）+两个自由边界（左、前）
物质组成条件	滑体	块裂岩体
	滑带	中后部由三组结构面及岩层面形成阶梯状滑带，前部岩层溃曲形成缓倾结构面
	滑床	侏罗系中统沙溪庙组（J₂s）上部灰绿色砂岩夹泥岩，下部紫红色泥岩夹砂岩

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表 2 卡门子湾滑坡区易发性结果分析表

Table 2. Summey table of landslide susceptibility results at Kamenziwan landslide area

以疑似滑坡区为样本的滑坡易发性评价结果
卡门子湾滑坡区	栅格数	各分区占比/%	极高及较高易发区占比/%
极高易发	5986	26.6	82.8
高易发	12640	56.2
中易发	3750	16.7
低易发	113	0.5
极低易发	0	0.0
总计	22489	100

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