ZHANG Jingshun, ZHANG Shishu, ZHOU Guangming, XU Xu, FENG Jianming. 2016: COLLAPSE MECHANISM OF GENTLE INCLINED AND FINE-GRAINED SOIL SLOPE ON RESERVOIR BANK. JOURNAL OF ENGINEERING GEOLOGY, 24(5): 752-759. DOI: 10.13544/j.cnki.jeg.2016.05.004
    Citation: ZHANG Jingshun, ZHANG Shishu, ZHOU Guangming, XU Xu, FENG Jianming. 2016: COLLAPSE MECHANISM OF GENTLE INCLINED AND FINE-GRAINED SOIL SLOPE ON RESERVOIR BANK. JOURNAL OF ENGINEERING GEOLOGY, 24(5): 752-759. DOI: 10.13544/j.cnki.jeg.2016.05.004

    COLLAPSE MECHANISM OF GENTLE INCLINED AND FINE-GRAINED SOIL SLOPE ON RESERVOIR BANK

    • Engineering practice and statistics show that reservoir bank collapse usually occur in loose accumulation when slope is greater than 15 degrees. Reservoir bank collapse is small possibility when bank slope is 10 degrees or so. But it happens in Qiaoqi hydropower station reservoir area on Sichuan Baoxing River. As an factual example, the Mahuang valley 5# accumulation body is composed of gravelly clay. Particle size of less than 0.075mm is accounted for about 60%.The collapse mode of reservoir bank is slow creeping deformation after impoundment. Deformation range gradually expands backward. After more than nine years, deformation continues. This paper takes Mahuang valley 5# accumulation body as an example. It is on the basis of exploration and test work about soil structure and soil particle composition, reservoir operation mode and deformation monitoring results, and coupling analysis of finite element analysis of transient seepage and stability analysis. It studies the collapse mechanism of gently inclined slope on reservoir bank. The results show that fine-grained soil structure and weak water permeability are the main causes of accumulation of creep deformation in Qiaoqi reservoir area. The gently inclined slope stability and the periodical change of water level have an obvious correlation. With the rise and fall of water level change, the reservoir bank presents different steady states and the creep deformation rate differently.
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