支流侵蚀对澜沧江上游亚贡倾倒体的影响  

Effect of tributary erosion on Yagong dumping in upstream of Lancang River

作　　者：尚琪 涂国祥[1] 罗新平 SHANG Qi;TU Guoxiang;LUO Xinping(Chengdu University of Technology, Chengdu, Sichuan 610059,China)

机构地区：[1]成都理工大学,四川成都610059

出　　处：《中国地质灾害与防治学报》2020年第4期39-44,51,共7页The Chinese Journal of Geological Hazard and Control

基　　金：国家自然科学基金项目(41472274);地质灾害防治与地质环境保护国家重点实验室自由探索课题(SKLGP2017Z010)。

摘　　要：澜沧江上游发育大型倾倒变形体,其强倾倒深度可达近200 m。在其形成过程中不仅向澜沧江一侧产生强烈倾倒,同时还向澜沧江支流-木水河侧产生了强烈倾倒变形破坏,并且木水河两岸岩体的倾倒变形程度有着显著差异。基于大量地表调查,结合平硐资料,对该倾倒变形体的发育特征进行了详细调查,重点对木水河的侵蚀作用对该倾倒变形体的影响展开了深入研究,得出以下结论:1.边坡内平移断层F105使得该倾倒体岩层走向与坡面近于平行,这是导致边坡木水河侧岩层产生强烈倾倒的内在原因;2.木水河强烈侵蚀作用导致的岸坡岩体卸荷松弛是促使岩体向木水河侧产生强烈倾倒的外在动力;3.该倾倒变形的形成演化经历了两个阶段,分别是澜沧江侵蚀阶段和木水河侵蚀阶段,并造成亚贡倾倒体岩体分别向两个方向发生卸荷与倾倒破坏。It develops a large-scale dumping deformation body in the upper reaches of Lancang River with its strong dumping depth of nearly 200 m.During its formation,it not only dumped strongly to the side of the Lancang River,but also to the side of Mushui River,an orthogonal tributary of the Lancang River,even caused deformation.Also,there is a significant difference in the degree of toppling deformation between the two sides of Mushui River.Based on a large number of surface surveys,combining data of Pingtong,this paper investigates the developmental characteristics of the dumping deformation body detailedly,focusing on studying the impact of the erosion effect of the Mushui River on the dumping deformation body,concluding that:1.The fault F105 in the area makes the trend of the dumping stratum nearly parallel to the slope on the left bank of the Mushui River,which is the intrinsic reason for the strong dumping of the rock mass on the left bank of the Mushui River;2.The unloading relaxation of the rock mass caused by the strong erosion of the Mushui River is the external force that promotes the strong dumping of the rock mass to the Mushui River side;3.The formation and evolution of the dumping deformation has experienced two stages,namely the Lancang River erosion stage and the Mushuihe erosion stage,which results in the unloading and dumping failure of the Yagong Dumping Rock Mass in two directions.

关 键 词：澜沧江上游 倾倒变形 支流侵蚀 演化过程 

分 类 号：P642.2[天文地球—工程地质学]