LI Hongjie, DAI Fuchu, LI Weichao, XU Ling, MIN Hong, ZHAO Chunhong. 2008: DEFORMATION MECHANISM OF THE NORTHERN SLOPE AT A TRANSFORMER SUBSTATION IN YANJIN, NORTHEASTERN YUNNAN PROVINCE. JOURNAL OF ENGINEERING GEOLOGY, 16(4): 476-481.
    Citation: LI Hongjie, DAI Fuchu, LI Weichao, XU Ling, MIN Hong, ZHAO Chunhong. 2008: DEFORMATION MECHANISM OF THE NORTHERN SLOPE AT A TRANSFORMER SUBSTATION IN YANJIN, NORTHEASTERN YUNNAN PROVINCE. JOURNAL OF ENGINEERING GEOLOGY, 16(4): 476-481.

    DEFORMATION MECHANISM OF THE NORTHERN SLOPE AT A TRANSFORMER SUBSTATION IN YANJIN, NORTHEASTERN YUNNAN PROVINCE

    • At a transformer substation in northeastern Yunnan Province, a slope was filled for sufficient constructing areas. The fill slope was composed of Quaternary accumulative formation and underlain Triassic detrital rock. The materials of the upper layer were predominated with accumulative formation such as landfill, gardening soil and silty clay The upper layer was underlain by a thin layer composed of completely to highly weathered mudstone. It was prone to become softer and its strength could be reduced significantly when moisturized. The lower layer was composed of packsand. After a period of heavy rainfalls, the fill slope started to creep and deform, which threatened the safety of the transformer substation, dead end tower of 110 kv output power. This paper described the geological environmental background of the northern slope on the 220kV Yanjin transformer substation. It further presented a detailed analysis of deformation mechanism through field investigation and laboratory testing. The slope deformation was probably caused by a combination effect of unfavorable topographic, geological and hydro geological conditions, and external loading due to filling. It was concluded that the creep deformation of the slope was triggered by external loading applied at the back of the slope.
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