南天山大龙池堰塞体形成演化过程分析

摘要:
堰塞体是高山峡谷区开展工程建设重点关注的地质体，本研究以南天山大龙池堰塞体为研究对象，探索南天山高山峡谷地区堰塞体的成因及演化过程。基于大龙池区域卫星遥感影像、区域地质资料，依托现场调查和地质钻探等方法，结合理论计算与有限元-离散元模拟技术，对南天山高山峡谷地区堰塞体的成因及演化过程进行了系统研究。结果表明：(1)大龙池堰塞体北侧山体陡峭，山体表面可见多处滑坡擦痕和刻槽，堰塞体堆积结构具有明显的反粒序和拼图结构特征，提出了大龙池堰塞体为高速远程古滑坡堆积的成因机理；(2)通过复原大龙池北面山体滑坡原始坡面，对其运动学特征进行理论计算与数值仿真模拟，结果表明大龙池北侧山体曾发生高速远程滑坡；(3)大龙池堰塞体的形成演化过程可分为古滑坡孕育、古滑坡堵河形成堰塞体以及堰塞体溃决3个阶段。研究结论可为南天山地区类似堰塞体的成因分析提供参考。
- 堰塞体 /
- 堆积特征 /
- 古滑坡 /
- 形成演化 /
- 大龙池
Abstract: Objective
Landslide dams are a geological body of key concern for engineering construction in alpine canyon areas. This paper takes the Dalongchi landslide dam in the South Tianshan Mountains as the research object to explore the origin and evolution process of the landslide dam in alpine canyon areas of the South Tianshan Mountains.
Methods
Based on satellite remote sensing images, regional data, field investigation, and geological drilling data in the Dalongchi region, combined with theoretical calculations and finite element discrete element simulations, this paper systematically delved into the deposit characteristics and the formation and evolution process of the Dalongchi damming body.
Results
The results show that (1) Many landslide scratches and grooves can be seen on the steep mountain surface on the North side of the Dalongchi damming body, of which the packing structure has obvious inverse grading features and a jigsaw structure, and it is speculated that the formation may be caused by the accumulation of the high-speed and long-distance ancient landslide of Dalongchi. (2) By conducting the recurrence of the northern original surface of the Dalongchi landslide and theoretical calculation and numerical simulation on its kinematic characteristics, the results were then induced that there was a high-speed and long-distance landslide on the north side of the mountain that led to the formation of the damming body of Dalongchi. (3) The formation and evolutionary phases of the Dalongchi damming body can be divided into the embryonic stage of ancient landslides, the river-blocking forming stage of the damming stage by ancient landslides, and the overlapping stage of ancient damming bodies.
Conclusion
The study of the formation and evolution of the Dalongchi dammingbody can provide a reference for the subsequent genetic analysis of similar studies in the southern Tianshan region.
- landslide dam /
- accumulation characteristics /
- ancient landslide /
- formation and evolution /
- Dalongchi
注释:

所有作者声明不存在利益冲突。

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图 1 研究区遥感影像图

Figure 1. Remote sensing image of the study area

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图 2 大龙池堰塞体区域地质图

Figure 2. Geological map of the Dalongchi landslide dam

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图 3 大龙池堰塞体工程地质图和A-A′剖面图

Figure 3. Engineering geological map of the Dalongchi landslide dam and A-A′ profile

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图 4 堆积结构特征

Figure 4. Characteristics of the accumulation structure

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图 5 钻孔DXLCZ-5(a, b)和DXLCZ-6(c, d)岩心照片

Figure 5. DXLCZ-5(a, b) and DXLCZ-6(c, d) core photos

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图 6 北侧岩壁表面构造特征

Figure 6. Surface structural characteristics of the northern rock wall

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图 7 大龙池堰塞体形成演化过程

Figure 7. Formation and evolution process of the Dalongchi landslide dam

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图 8 大龙池右岸斜坡岩体结构面赤平投影图

J1. 张拉节理；J2. 剪切节理

Figure 8. Stereographic projection of the discontinities on the right bank of the Dalongnci rock slope

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图 9 基于最大运动距离(a)和质心运动距离(b)的滑体速度变化曲线

Figure 9. Speed variation curve of the sliding mass based on the maximum movement distanc (a) and centroid motion distance (b)

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图 10 不同时间滑坡运动状态

Figure 10. Landslide motion state at different times

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图 11 不同监测颗粒速度变化图

Figure 11. Different monitoring particle velocity changes

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图 12 不同监测颗粒位移变化图

Figure 12. Different monitoring particle displacement changes

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表 1 模型颗粒微观参数

Table 1. Microscopic parameters of model particles

球最小半径R_min/m	球半径比R_max/R_min	球-球接触模量E_c/GPa	球刚度比k_n/k_s	平行黏结半径乘子λ	平行黏结模量E_c/GPa	平行黏结刚度比k_n/k_s	球摩擦因素f
4	2	34	1	1	34	1.5	0.5

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