220kV盐津变电所滑坡形成条件及成因机制研究

2005年7月,正在施工中的220kV盐津变电所北面斜坡发生滑坡,直接危及到变电所的安全,针对该滑坡的抗滑,采用了抗滑桩措施进行整治,累计增加工程费用约1000万元。文章在阐述该滑坡体岩土工程条件的基础上,分析了该滑坡的形成条件,包括坡体结构条件、下伏泥岩的工程特性、降雨条件、工程荷载因素。同时,分析了该滑坡的成因演化机制,认为该滑坡经历了蠕变、剪切、滑动破坏三个阶段,并且蠕变阶段塑性变形特征明显,具有较宽的塑性变形区域。

The Study on Forming Condition and Mechanism of Landslide for 220kV Yanjin Substation

The north slope of 220kV Yanjin substation slid during construction in July,2005,which would directly endanger the safety of the substation.The corresponding disposal measure of anti slide pile was adopted,which result in the engineering outlay of 10 million increased.The paper based on the geotechnical condition of landslide,the forming condition are analyzed including the slope structure,engineering properties of underplayed Mud Stone,rainfall condition,engineering load factor.In the same time,the formation mechanisms of landslide are presented.And it comes to the conclusion the process of landslide suffered three phase including creep deformation,shearing,sliding motion and failure;the deformation character of creep deformation phase is well marked and has a wide plastic deformation form.