金沙江溪洛渡—白鹤滩段岸坡变形破坏规律

为深入研究金沙江溪洛渡—白鹤滩段库区岸坡变形破坏的形成与分布规律,通过现场调查复核,结合高清航空影像资料解译,确定了库区岸坡结构与地层岩性的分布状况,并统计分析了库区95个变形破坏体的空间展布特征。研究表明:该段库区岸坡变形破坏在薄层—互层状结构岸坡中最发育,在奥陶系上统与志留系(O₃+S)等3类地层中较强发育;变形破坏的形态特征遵从幂律规则,水平投影长度等参数与累计频率P之间呈现负指数关系,变形破坏密度和模数的对数值与累计频率P之间呈线性关系;在α=0.05水平下,变形破坏密度在0.038 ~1.184个/km之间,变形破坏模数在(20~4 656)×10⁴ m³/km之间。研究成果可供研究金沙江干流库区岸坡变形破坏的技术人员参考。

Laws of Deformation and Failure of Bank Slope from Xiluodu to Baihetan Segment of Jinsha River

In an attempt to probe into the laws of deformation and failure of bank slope in Xiluodu-Baihetan reach of Jinsha River, we obtain the distribution of bank slope structure and lithology in this segment, and analyze statistically the spatial distribution characteristics of 95 deformation and failure bodies through field investigation and interpreting of high-definition aerial image data. Results reveal that deformation and failure of bank slope is the most developed in the thin layer to interlayer structure, and well developed in the upper Ordovician and the Silurian system and other two types of strata. The morphological characteristics of deformation and failure obey the power law. Cumulative frequency is in negative exponential relationship with horizontal projection length and other parameters, and in linear relationship with the logarithm of the density and modulus of deformation failure. When α equals 0.05, the density of deformation and failure of bank slope ranges in 0.038-1.184 points per kilometer, and modulus between 20×10⁴ m³/km and 4 656×10⁴ m³/km