云南昭通市盐津变电所滑坡成因及治理措施

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。针对该滑坡的特点,采用抗滑桩结合排水沟措施进行整治,累计增加工程费用约1500万元。文章在阐述该滑坡体岩土工程条件的基础上,分析了其形成条件(坡体结构、下伏泥岩工程地质特性、降雨条件、工程荷载因素)及成因演化机制。认为该滑坡经历了蠕变、剪切、滑动破坏3个阶段,且蠕变阶段塑性变形特征明显,具有较宽的塑性变形区域。最后对该滑坡提出了抗滑桩结合排水沟的治理方案。经验证,该治理措施是安全有效的。

Genetic analysis and treatment measures of landslide at Yanjin 220kV electricity transformer substation in Zhaotong City, Yunnan Province

The north slope of Yanjin 220kV electricity transformer substation slided during construction in July,2005,which would directly endanger the safety of the substation.The corresponding disposal measure of anti slide pile and drainage were adopted,that resulted in the engineering outlay of 15 million yuan 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 that the process of landslide suffered three phase including creep deformation,shearing,sliding motion and failure of sliding;the deformation character of creep deformation phase is well marked and has a wide plastic deformation form.At last the treatment measures of anti-slide pile and drainage were presented and had been proved to be safe and effective.