任爱武, 周自梁, 段庆伟, 孙平, 赵宇飞. 2013: 金沙江上游某大型古堆积体群地质成因分析. 工程地质学报, 21(2): 243-249.
    引用本文: 任爱武, 周自梁, 段庆伟, 孙平, 赵宇飞. 2013: 金沙江上游某大型古堆积体群地质成因分析. 工程地质学报, 21(2): 243-249.
    REN Aiwu, ZHOU Ziliang, DUAN Qingwei, SUN Ping, ZHAO Yufei. 2013: ANALYSIS ON GEOLOGICAL ORIGIN OF ANCIENT ACCUMULATION BODY GROUP AT UPPER REACHES OF JINSHA RIVER. JOURNAL OF ENGINEERING GEOLOGY, 21(2): 243-249.
    Citation: REN Aiwu, ZHOU Ziliang, DUAN Qingwei, SUN Ping, ZHAO Yufei. 2013: ANALYSIS ON GEOLOGICAL ORIGIN OF ANCIENT ACCUMULATION BODY GROUP AT UPPER REACHES OF JINSHA RIVER. JOURNAL OF ENGINEERING GEOLOGY, 21(2): 243-249.

    金沙江上游某大型古堆积体群地质成因分析

    ANALYSIS ON GEOLOGICAL ORIGIN OF ANCIENT ACCUMULATION BODY GROUP AT UPPER REACHES OF JINSHA RIVER

    • 摘要: 金沙江上游地质条件复杂,大型古堆积体群普遍发育,严重影响该区的水利水电开发建设。合理的解释古堆积体群的地质成因问题是进行水电建设工作的基础。本文以金沙江上游某水电站古堆积群现场工程为依托,通过工程地质分区、岩体结构特征分析和地质现象分析3个步骤,逐步还原了堆积体群的形成过程。最终结论如下: (1)以古堆积体群整体形貌特征为基础,结合岩性、结构等基本特性,将古堆积体群划分为4个区域; (2)根据古堆积群Ⅱ区的形貌特征假设Ⅱ区物质来自河对岸,继而采用结构特征分析证明了这一假设,结果表明: Ⅱ区物质与河对岸物质结构具有较好的一一对应关系,同时物质结构具有明显的分选性,为典型的泥石流产物; (3)结合区域风化程度、S型转弯、冲积扇、高位静水沉积等地质现象分析,还原了该古堆积体群的形成过程,即: Ⅰ区风化程度较严重,年代明显早于其他各区。Ⅲ区、Ⅳ区之间应为古河道,Ⅰ区的形成造成了河流的S形改道,但并未造成真正意义上的堵江。真正的堵江事件发生在Ⅱ区形成后。Ⅱ区泥石流物质与Ⅲ区、Ⅳ区物质一起形成了一个天然土石坝,形成了真正意义上的堵江,产生了高位沉积现象。此时江水一部分从古河道流出,一部分从Ⅱ区泥石流物质区向下渗流,最终Ⅱ区物质被掏蚀冲垮,形成了今河道。

       

      Abstract: The accumulation body group is an aggregate of accumulations. It can be seen everywhere along the upper reaches of Jinsha river. It is a big problem to limit the progress of hydropower development at this area. This paper examines the problem using a project of a hydropower station at upper reaches of Jinsha river. This place is strongly affected by geological structure and climate. The ancient accumulation body group lies on the right bank of the upper reaches of Jinsha river. Its size is almost three million tons and its geological structure and origin can not be certain. It is located just only about one kilometer distance to the hydropower station. So it will be a big problem of the hydropower project. Three methods are applied to analyze the problem in this paper. They are topographic feature analysis, rock structure theory, and analogy analysis. Finally, four results are achieved.(1)on the basis of topographic feature, the accumulation group can be divided into four domains.(2)Comprehensive topographic and geological structure feature analysis results are achieved that river blocking had happened at this area.(3)the product period of domain Ⅰ is earlier than the other domains. However, the river blocking was not happened during the period of domain I production. The production of domain Ⅰ just made the river diversion.(4)the structure of domain Ⅱ have a separation grade feature from up to down. This is a typical character belong to debris flow. So the conclusion is that the domain Ⅱ was come from anti-shore. The true river blocking was happened after the domain Ⅱ production.

       

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