五盂高速公路K21～K25段顺层滑坡变形特征及破坏原因分析

Research on Deformation and Failure Mechanism of Bedding Landslides Between 21 to 25 Kilometers of Wutai- yuxian Expressway

五台至盂县高速公路在K21～K25段分布有八段顺层路堑边坡，边坡岩体中的中～缓倾角结构面及软弱夹层发育，路堑的开挖已引起七段边坡发生不同程度的变形或滑动。根据工程地质勘察结果及施工过程中边坡变形情况，依托代表性的五号高边坡，从边坡的地质环境及多次变形特征人手，对其形成原因及破坏机制做了分析研究。研究结果表明，边坡中软弱夹层的存在，加之长期的差异风化蚀变、构造作用、降雨、不规范施工等原因，是该边坡产生滑动的控制性因素。对该边坡的研究，可为以后类似边坡（滑坡）勘察及处治提供依据及参考。

There are eight period of bedding cutting slope between K21 to K25 kilometers of Wutai to Yuxian expressway, rock mass eontains many gently dipped structure planes and soft intercalations, cutting excavation has caused seven slopes deformation or sliding of different degree. According to engineering geology investigation results and the slope deformation of the construetion, depending on the representation of the no. 5 slope, starting from the geological environment of slope and multiple deformation characteristics, the causes of their formation and failure mechanism analysis are made and research. The research results show that the slope of soft intercalation, coupled with long - term difference weathering alteration, tee- tonic action, rainfall, non- standard construction, which is the controlling factors of the slope sliding. The conclusion may be useful for geological exploration and treatment of similar engineering.