Mechanism of Geological Processes of Formation and Deformation of the Huangtupo Landslide
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摘要: 巴东黄土坡滑坡是三峡库区重大滑坡之一, 规模大, 而且形成与变形地质过程机制复杂.是与三峡库区构造强烈隆升、河流急剧下切、斜坡重力卸荷等各种作用相伴生的地质过程的结果; 其中的Ⅰ号崩滑堆积体在回水条件下深层蠕动变形较明显, 受到多方面的关注.采用地质过程类比分析方法, 通过对滑坡形成、回水前变形破坏、回水条件下变形的地质过程机制分析, 预测了深层蠕动变形使其中部和前部产生较大变形的发展趋势, 目前发现Ⅰ号崩滑堆积体的深层蠕动变形问题, 主要是库水升降的动态过程与降雨效应耦合作用的结果.Abstract: Badong landslide is one of the most serious landslides in the Three Gorges Reservoir Area for its large scale and complex formation and deformation processes.It was formed as a result of intense tectonic uplift of the Three Gorges Reservoir Area, rapid cut-down of the river and slope unloading.The deep creep deformation of No.1 collapse deposits under backwater conditions is obviously observed and has been paid special attention to.By the geological process analogy and analysis, we analyze the formation of slopes, deformation and destruction process, the mechanism of geological processes of formation and deformation under backwater conditions.We predict the trend that slide may happen in the front and middle part of the collapse deposits on a large scale, and it finds that deep creep distortion of No.1 collapse deposits is mainly caused by the coupling of reservoir water and rain water.
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Key words:
- Huangtupo landslide /
- formation /
- backwater condition /
- deformation /
- mechanism of geological processes
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图 1 黄土坡滑坡组成分布图
1.Ⅰ号崩滑堆积体; 2.Ⅱ号崩滑堆积体; 3.变电站滑坡; 4.园艺场滑坡; 5.近代滑坡; 6.水系及沟谷; 7.近代滑坡编号; 8.剖面线; 9.平硐
Fig. 1. Distribution of Huangtupo landslide
图 2 崩滑堆积体物质组成结构剖面图
1.滑带; 2.软弱夹层; 3.散裂岩; 4.碎裂岩; 5.块裂岩; 6.碎石土夹粘土; 7.泥质灰岩; 8.泥灰岩; 9.灰岩; 10.钻孔及编号; 11.水位线
Fig. 2. Geological section of collapse deposits
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