【作者】 李宏杰； 戴福初； 李维朝； 许领； 闵弘； 赵春宏；

【Author】 LI Hongjie~①DAI Fuchu~①LI Weichao~①XU Ling~①M IN Hong~②ZHAO Chunhong~③(①Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029)(②Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071)(③Yunnan Electric Power Design Institute,Kunming 650011)

【机构】 中国科学院地质与地球物理研究所； 中国科学院武汉岩土力学研究所； 云南省电力设计院；

【摘要】 该填土边坡位于云南省盐津县,场地岩土层主要由人工填土、耕植土和粉质粘土等第四系松散堆积层,以及全-强风化泥岩和中-微风化细砂岩等下伏基岩组成。全-强风化泥岩呈紫红色,岩质软弱,具有遇水软化成泥且强度迅速降低的特点。经过2d的强降雨之后,该填土边坡开始蠕滑变形,从地形地貌、地层岩性、地质构造、水文地质条件等场地条件和人类活动等方面对边坡的变形机制进行了分析。结果表明:边坡变形特征是一种推移式蠕滑变形,场地平整填方加载是造成边坡变形的诱发因素,不良的地形地貌、地质结构和地下水条件是导致边坡蠕滑变形的内在因素。更多还原

【Abstract】 At a transformer substation in northeastern Yunnan Province,a slope was filled for sufficient constructing areas The fill sbpe was composed of Quaternary accumulative formation and underlain Triassic detrital rock. The materials of the upper layerwere 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 sbpe started to creep and deform,which threatened the safety of the transformer substation,dead end towerof 110 kv outputpower.Thispaper 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 deform ation 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 trig- gered by external loading applied at the back of the slope.更多还原