张世殊, 冉从彦, 曲海珠, 等. 2024. 藏东南卡瓦白庆抽蓄电站高位冰川槽谷堆积物稳定性及工程影响分析[J]. 工程地质学报, 32(3): 1112-1128. doi: 10.13544/j.cnki.jeg.2024-0017.
    引用本文: 张世殊, 冉从彦, 曲海珠, 等. 2024. 藏东南卡瓦白庆抽蓄电站高位冰川槽谷堆积物稳定性及工程影响分析[J]. 工程地质学报, 32(3): 1112-1128. doi: 10.13544/j.cnki.jeg.2024-0017.
    Zhang Shishu, Ran Congyan, Qu Haizhu, et al. 2024. Stability and engineering impact analysis of high level glacier valley deposits at the Kawabaiqing pumped storage power station in southeast Tibet[J]. Journal of Engineering Geology, 32(3): 1112-1128. doi: 10.13544/j.cnki.jeg.2024-0017.
    Citation: Zhang Shishu, Ran Congyan, Qu Haizhu, et al. 2024. Stability and engineering impact analysis of high level glacier valley deposits at the Kawabaiqing pumped storage power station in southeast Tibet[J]. Journal of Engineering Geology, 32(3): 1112-1128. doi: 10.13544/j.cnki.jeg.2024-0017.

    藏东南卡瓦白庆抽蓄电站高位冰川槽谷堆积物稳定性及工程影响分析

    STABILITY AND ENGINEERING IMPACT ANALYSIS OF HIGH LEVEL GLACIER VALLEY DEPOSITS AT THE KAWABAIQING PUMPED STORAGE POWER STATION IN SOUTHEAST TIBET

    • 摘要: 卡瓦白庆抽水蓄能电站是藏东南(玉察)水风光一体化基地中重点实施的抽蓄电站,其下水库右侧岸坡高位发育有3条大型冰川沟槽,沟内堆积着巨量第四纪堆积物,若该槽谷内堆积物发生整体或大范围失稳冲入库内将严重影响工程建设及运行安全。如何科学认识槽谷堆积物的稳定性,合理评价其工程影响直接关系到工程库址方案选择。目前关于冰川槽谷堆积体的工程勘察评价无相关技术标准可循,国内外也几乎没有可参考的类似工程进行经验类比分析。本研究基于槽谷堆积物沉积历史和表观特征、典型植被发育情况、历史卫星影像对比、InSAR技术变形识别进行综合分析,宏观判别堆积物是整体稳定的;同时利用离散-连续耦合及极限平衡方法对2#槽谷堆积物进行了数值模拟及计算分析,结果表明:在天然、降雨及地震工况下,堆积体整体处于稳定状态。堆积物在重力条件下的变形有限,主要集中于槽谷内地形陡缓交界部位,但不会发生整体或大范围的破坏,只会在前缘陡缓交界区域出现局部变形调整。本研究为高海拔地区冰川槽谷背景下的工程建设、灾害监测等方面的工作提供了参考。

       

      Abstract: The Kawabaiqing Pumped Storage Power Station is a key implementation of a pumped storage power station in the integrated water and wind power base in southeastern Tibet(Yucha). There are three large grooves developed on the right bank slope of the lower reservoir, in which a large amount of Quaternary deposits is accumulated. If the deposits in this groove experience overall or large-scale instability and rush into the reservoir, it will directly affect the safety of the construction and operation of the project. Currently, there are no codes about the investigation of the glacier valley deposits, and almost no engineering projects to refer to for empirical analogy analysis. This article analyzes the sedimentary history and apparent characteristics of valley deposits, typical vegetation development, comparison of historical satellite images, InSAR technology deformation recognition, and macroscopically determines that the deposits are generally stable; Furthermore, the discrete continuous coupling and limit equilibrium methods were used to numerically simulate and calculate the accumulation of sediment in the 2# trough. The results showed that under natural, rainfall, and seismic conditions, the slope is a whole and locally remained stable. The deformation of the slope under gravity conditions is limited, mainly concentrated at the junction of steep and gentle terrain, but the accumulation will not cause overall or large-scale damage, only local deformation adjustments will occur in the front edge steep and gentle junction area. This study will provide a systematic reference for engineering construction and disaster monitoring under the background of high-altitude glacial valleys, and provide a reliable method for determining the engineering stability of glacial valley deposits.

       

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