澜沧江上游亚贡深部倾倒变形体发育特征及形成机制  

Development Characteristics and Formation Mechanism of Deep-Seated Toppling in Yagong,Upper Reaches of Lancang River

作　　者：罗新平 涂国祥 尚琪 LUO Xinping;TU Guoxiang;SHANG Qi(State Key Laboratory of Geological Disaster Prevention and Protection and Geological Environmental Protection,Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室

出　　处：《水利与建筑工程学报》2019年第5期37-43,共7页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金“降雨在山岳型冰水堆积体中的入渗过程及对其稳定性影响的时间效应研究”(41472274)

摘　　要：西南深切河谷陡立层状的岩质边坡中常常发育大规模的倾倒变形体,并且发育深度较大,最深可达200 m^300 m。以澜沧江上游亚贡深部倾倒体为例,通过现场调查与平硐勘测,结合倾倒变形的工程地质研究方法,深化分析了深部倾倒变形体岩体产状变化,岩体完整程度及结构面发育特征。研究表明:该边坡内发育多处倾倒折断带,高高程岩体变形剧烈,靠近河床部位倾倒现象不明显;倾倒体的发育深度由高高程向低高程逐级降低;研究边坡的倾倒强度可分为强倾倒体与弱倾倒体;同时得出了其形成机制与卸荷回弹-弯曲变形-折断破坏的演变过程。In the steep bedded rock slope of deep-cut valley in southwest China, large-scale toppling deformation bodies are often developed, and the depth of development is large, sometimes could reach up to 200 m^300 m. By taking Yagong deep dumping body in the upper reaches of Lancang River as an example, through on-site investigation and adit survey, combined with the engineering geological research methods of dumping deformation, the occurrence change, rock mass integrity and structural plane development characteristics of deep dumping deformation body are deeply analyzed. The results show that there are many collapse fracture zones in the slope, and the deformation of high-level rock mass is intense, and the collapse phenomenon near the riverbed is not obvious, and the development depth of the collapse body decreases step by step from elevation to low elevation. The collapse strength of the slope can be divided into strong collapse body and weak collapse body. The formation mechanism and the evolution process of unloading rebound-bending deformation-breaking failure are discussed as well.

关 键 词：澜沧江上游 深部倾倒 发育特征 形成机制 

分 类 号：P642[天文地球—工程地质学]