重庆武水高速公路K41切层岩石滑坡的形成机理

The Formation Mechanism of K41 Cross-bedding Rock Landslide in Chongqing Wulong-Shuijiang Highway

重庆武水高速公路K41滑坡为一大型切层岩石滑坡,自2009年8月以来,坡体下沉、滑移及坡面开裂等现象日趋加大,呈持续性滑动变形。该滑坡的形成、发展与坡体复杂的工程地质条件密切相关系:上硬下软的坡体结构是古错落体形成的基础,高边坡开挖产生了较大的临空面,加之连续降雨的影响,使古错落体切断软弱岩层转化为切层岩石滑坡。结合滑坡的变形特征及监测资料对其稳定性进行了综合分析,确定了滑坡在不同条件下的安全系数,并对治理工程设计提出了建议。

K41 landslide along Wulong-Shuijiang Highway in Chongqing is a large-scale cross-bedding rock landslide,which has been sliding continuously for slope settlement,displacement and surface crack become more serious since August 2009.The formation and development of this landslide are closely related to the complex engineering geological conditions.Slope structure composed of soft rockmass in lower part and hard rockmass in upper part is the foundation of ancient faulted rockmass,which cut off the weak rockmass into bedding rock landslide when larger exposure face is produced during high slope excavation along with the influence of continuous rainfall.Combined with the deformation characteristics and monitoring data,the stability of landslide is analyzed comprehensively in this paper.Then the safety factor of landslide under different conditions has been determined and the suggestion for engineering treatment has been put forward.