甘肃舟曲江顶崖古滑坡形成演化机理与堆积体稳定性评价

刘涛; 张明; 王立朝; 杨龙; 殷保国

doi:10.19509/j.cnki.dzkq.tb20230076

甘肃舟曲江顶崖古滑坡形成演化机理与堆积体稳定性评价

doi: 10.19509/j.cnki.dzkq.tb20230076

刘涛^1,,
张明^1, ,,
王立朝²,
杨龙¹,
殷保国¹

1.
中国地质大学(武汉)工程学院, 武汉 430074
2.
中国地质环境监测院, 北京 100081

基金项目:

甘肃省舟曲重大地质灾害风险评价及综合防控技术研究项目 2021-001

详细信息

作者简介:
刘涛, E-mail: 2200835079@qq.com

通讯作者:
张明, E-mail: zhangming8157@126.com

中图分类号: P642.22
计量
- 文章访问数: 439
- PDF下载量: 40
- 被引次数: 0
出版历程
- 收稿日期: 2023-02-15
- 录用日期: 2023-03-31
- 修回日期: 2023-03-27

Formation and evolution mechanism of the ancient landslide and stability evaluation of the accumulation body in Jiangdingya, Zhouqu County, Guansu Province

1.
Engineering Faculty, China University of Geosciences(Wuhan), Wuhan 430074, China
2.
China Geological Environment Monitoring Institute, Beijing 100081, China

More Information

Author Bio:
LIU Tao, E-mail: 2200835079@qq.com

Corresponding author: ZHANG Ming, E-mail: zhangming8157@126.com

摘要

摘要:
古滑坡堆积体复活是我国青藏高原及周边地区的主要地质灾害类型之一, 也是我国西部正在建设的重大交通和水利工程面临的主要安全威胁之一。因此, 对古滑坡的形成演化机理进行研究并对其堆积体进行稳定性评价, 显得极为重要, 可以为古滑坡堆积体复活的早期识别与防治设计提供理论支持。甘肃省舟曲县江顶崖古滑坡堆积体近十年来数次局部复活形成滑坡堵塞白龙江, 对当地人民的生命财产安全造成严重威胁。通过现场调查和无人机倾斜摄影等手段, 查明了江顶崖古滑坡堆积体的形态和结构特征, 在此基础上分析了滑坡的演化机理和动力学过程, 再结合InSAR变形数据对堆积体的稳定性进行了定性评价。结果显示, 江顶崖古滑坡是典型的大型地震滑坡, 其滑体沿3个方向坐落式下滑, 形成了如今多级台阶状的堆积体形态; 在地震荷载作用下古滑坡的动力学过程可分为中上部震动-拉裂、前缘锁固段剪断-滑坡启动、后缘拉裂-滑体加速、前缘受阻-滑体减速、稳定阶段。由于古滑坡在地震荷载作用下整体下滑, 导致上部堆积体内存在大量结构完整的岩体, 因此较为稳定; 而中下部堆积体大都为断层破碎带和破碎岩体组成的软弱结构, 稳定性较差, 未来极有可能复活。
- 江顶崖古滑坡 /
- 堆积体复活 /
- 演化机理 /
- 堆积体稳定性 /
- 地震荷载 /
- 断层破碎带
Abstract: Objective
The resurrections of ancient landslide deposits are one of the primary geological hazards in the Qinghai-Tibet Plateau and surrounding areas of China and pose significant safety threats to major transportation and water conservancy projects under construction in western China. Therefore, it is crucial to investigate the formation and evolution mechanism of ancient landslides and evaluate the stability of their deposits. This research can provide theoretical support for the early recognition and prevention of the resurrection of ancient landslide deposits.
Methods
The ancient landslide deposits in Jiangdingya, Zhouqu County, Gansu Province, have experienced local resurrection several times in the past decade, creating severe threats to the lives and property of local people by blocking the Bailong River. To determine the morphology and structural characteristics of the ancient Jiangdingya landslide deposits, this study utilized field investigations and unmanned aerial vehicle (UAV) tilt photography. Based on this, the evolution mechanism and dynamic process of the landslide were analysed, and the stability of the deposits was qualitatively evaluated using InSAR deformation data.
Results
The results show that the ancient landslide at Jiangdingya is a typical large-scale earthquake landslide, with its sliding body located in a downslope position in three directions, forming a multilevel stepped deposit shape. The dynamic process of an ancient landslide under seismic loads can be divided into several stages, including vibration and cracking in the upper-middle part, shearing and landslide initiation in the front edge locking segment, tearing and landslide acceleration in the rear edge, obstruction and landslide deceleration in the front edge, and stabilization.
Conclusion
Due to the overall downwards movement of the ancient landslide under seismic loads, there are a large number of intact rock masses in the upper deposits, which are relatively stable. However, the middle and lower deposits are mostly composed of weak structures such as fault fracture zones and fragmented rock masses, which have poor stability and are highly likely to resurrect in the future. This study provides important insights into the formation and evolution of ancient landslides and the evaluation of their stability, which can help prevent future landslides and protect local communities.
- Jiangdingya ancient landslide /
- resurrection /
- evolutionary mechanism /
- stability of the accumulation body /
- seismic load /
- fault fracture zone
注释:

所有作者声明不存在利益冲突。

HTML全文

图 1 研究区构造背景图^[22]

F₁.东昆企断裂带; F₂.西秦岭断裂带; F₃.塔藏断裂带; F₄.迭部-白龙江断裂带; F₅.光盖山-迭山断裂带; F₆.临潭-宕昌断裂带; F₇.九寨沟-文县断裂带; F₈.平武-青川断裂带; F₉.北川-林庵寺断裂带; F₁₀.江油断裂带; F₁₁.鹏江断裂带; F₁₂.虎牙断裂带; F₁₃.康县-略阳断裂带; F₁₄.两当-江洛断裂带; F₁₅.礼县-罗家堡断裂带

Figure 1. Background map of geological formations in the study area

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图 2 甘肃舟曲江顶崖古滑坡发育特征及分区图

Figure 2. Development characteristics and zone of the Jiangdingya ancient landslide in Zhouqu County, Gansu Province

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图 3 甘肃舟曲江顶崖古滑坡剖面

Figure 3. Profiles of the Jiangdingya ancient landslide in Zhouqu County, Gansu Province

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图 4 甘肃舟曲江顶崖古滑坡发育特征

a~d.Ⅰ区；e~h.Ⅱ区；照片拍摄位置方向见图 2，拍摄方向以正北方向为0°顺时针表示

Figure 4. Development characteristics of the Jiangdingya ancient landslide in Zhouqu County, Gansu Province

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图 5 甘肃舟曲江顶崖古滑坡及周边滑坡分布情况

Figure 5. Distribution of the Jiangdingya ancient landslide and surrounding landslides in Zhouqu County, Gansu Province

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图 6 甘肃舟曲江顶崖古滑坡数值模型

Figure 6. Numerical model of the Jiangdingya ancient landslide in Zhouqu County, Gansu Province

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图 7 原始地震波波形

Figure 7. Waveform of the original seismic wave

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图 8 甘肃舟曲江顶崖古滑坡在不同时间段的运动状态

Figure 8. Movement of the Jiangdingya ancient landslide in Zhouqu County, Gansu Province during different time periods

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图 9 甘肃舟曲江顶崖古滑坡滑体前、中、后部速度时程监测曲线

Figure 9. Velocity time history monitoring curves at the front, middle, and rear of the Jiagdingya ancient landslide in Zhouqu County, Gansu Province

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图 10 2018年复活滑体应急治理工程平面图

Figure 10. Project plan of the 2018 resurrection slide body emergency treatment

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图 11 2018年复活滑体应急治理工程C-C′剖面图

Figure 11. Profile of the 2018 resurrection slide body emergency treatment

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图 12 古滑坡堆积体结构类型

Figure 12. Structural type of ancient landslide accumulations

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图 13 古滑坡堆积体变形特征图

Figure 13. Deformation characteristics of ancient landslide accumulations

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图 14 剖面D-D′、E-E′、F-F′特征点累计位移时程曲线

Figure 14. Cumulative displacement time history curves of the characteristic points of sections D-D′, E-E′ and F-F′

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表 1 岩体力学参数

Table 1. Mechanical parameters of the rock mass

岩体类型	弹性模量/GPa	泊松比	天然密度/(kg·m^-2)	内摩擦角/(°)	内聚力/MPa	抗拉强度/MPa
灰岩	50	0.16	2 700	65	2.0	1.5
炭质板岩	25	0.18	2 600	36	0.4	3.0
断层破碎带	15	0.20	2 500	30	0.1	2.2

下载: 导出CSV

表 2 结构面力学参数

Table 2. Mechanical parameters of the structural surfaces

岩体类型	法向刚度/(GPa·m^-1)	切向刚度/(GPa·m^-1)	内摩擦角/(°)	内聚力/MPa	抗拉强度/MPa
灰岩	2	0.4	30	0.3	0.1
炭质板岩	1	0.3	25	0.24	0.12
断层破碎带	0.8	0.15	22	0.16	0.08

下载: 导出CSV

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