| 杨武,葛华,李波,周洋,刘立勋.沐川县安家屋基古滑坡形成机制及其演化[J].矿产勘查,2025,16(S1):289-298 |
| 沐川县安家屋基古滑坡形成机制及其演化 |
| The formation mechanism and evolution of Anjiawuji ancient landslide in Muchuan County |
| 投稿时间：2024-10-28 |
| DOI：10.20008/j.kckc.2025S1036 |
| 中文关键词: 古滑坡 五指山背斜 断层 岩溶大泉 形成机制 局部复活 |
| 英文关键词: ancient landslide Wuzhishan anticline fault karst big spring formation mechanism partial reactivation |
| 基金项目:本文受中国地质调查局项目“乌蒙山区北部城镇地质灾害调查”(DD20160274)资助。 |
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| 中文摘要: |
| 川西南山地区地形起伏大，构造条件复杂，岩性岩相丰富，常发育一些非常规滑坡灾害。本文以沐川县安家屋基古滑坡为例，通过无人机航测、工程地质测绘、工程地质钻探和地球物理勘探，查明了滑坡区地质构造特征、水文地质与工程地质特征以及滑坡体空间展布特征，对古滑坡的形成机制和稳定性进行了研究，还原了古滑坡形成过程，研究取得了如下认识:安家屋基古滑坡位于五指山背斜西翼 3条逆断层所围限的三角地带，后缘 F3逆断层为控制古滑坡的关键性外倾结构面，喜山期以来，间歇性地壳抬升作用以及河流溯源侵蚀导致山体临空，继而后缘拉裂，岩溶大泉从拉裂槽灌入，致使山体沿断层面发生整体滑移，推算其水平滑动距离约 430 m，垂向滑动距离约 235 m，形成的巨型岩质滑坡堵塞沟道，后期沟道继续下切，古滑坡前缘局部复活形成新滑坡。 |
| 英文摘要: |
| In the mountainous region of southwestern Sichuan，the undulate terrain，complex tectonic condi.tions and rich lithology and lithofacies often cause some unconventional landslide hazards. Taking the Anjia Wujiancient landslide in Muchuan County as an example，this paper has studied the formation mechanism and stabilityof the ancient landslide and reconstructed the formation process of the ancient landslide by identifying thecharacteristics of geological structure，the hydrogeology and engineering geology as well as the spatial distributionof the landslide body in the landslide area through unmanned aerial survey，engineering geological mapping，engineering geological drilling and geophysical exploration. Consequently，the following insights have been gained:The Anjiawuji ancient landslide is located in the triangle area bounded by three reverse faults on the westwing of the Wuzhishan anticline，and the F3 reverse fault at the rear edge is the key outward inclined structuralplane controlling the ancient landslide. Since the Himalayan period，intermittent crustal uplift and river headward erosion led to the exposure of mountain slopes. Afterwards，the rear edge was pulled apart and the karst spring was poured in from the fracture groove，resulting the mountain slid along the fault plane with the horizontal slidingdistance estimated to be about 430 m and the vertical sliding distance about 235 m. The giant rock landslide thatformed subsequently blocked the channel. In later stages，as the channel continued to be undercut，the front edge of the ancient landslide is partially reactivated to form a new landslide. |
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