缓倾顺层岩质斜坡破坏条件和变形机制分析--以常吉高速公路朱雀洞滑坡为例  

Failure conditions and mechanism of the gentle dip bedding slopes:a case study of the Zhuquedong Landslide

作　　者：陈全明 方琼 罗冠枝 王国卫 CHEN Quanming;FANG Qiong;LUO Guanzhi;WANG Guowei(Hunan Institute of Geo-Environment Monitoring,Changsha, Hunan 410118, China)

机构地区：[1]湖南省自然资源事务中心,湖南长沙410118

出　　处：《中国地质灾害与防治学报》2020年第2期18-23,32,共7页The Chinese Journal of Geological Hazard and Control

基　　金：湖南省自然资源厅基金项目:湖南省1∶5万地质灾害详细调查成果集成(湘国土资预[2017]9号)。

摘　　要：总结国内外实例数据发现:缓倾条件下顺层斜坡能够产生滑移-弯曲变形;同类滑坡具有隐蔽性强、体积规模巨大、滑动面后陡前缓、多层滑动、突发性、高速、滑动距离有限等特征;顺层斜坡产生滑移-弯曲变形的必要条件为岩层倾角20°~60°、岩体软硬相间、节理与裂隙发育、岩层倾角>斜坡坡角、坡长达到数百米及以上、岩体剩余下滑力大于其临界值。为了研究缓倾顺层岩质斜坡滑移-弯曲变化过程,以常吉高速公路朱雀洞滑坡为例,采用地质调查、文献查询、理论计算、物理模拟相结合。首先对滑坡基本特征及其成因机制进行细致研究,建立了滑移-弯曲变形力学模型,进行了变形条件判别、稳定性评价。在此基础上,运用物理模型试验分析方法,再现了斜坡变形破坏演化过程,进一步证实了其滑移-弯曲型变形破坏机制。To study the mechanism of slipping-bending of the gentle consequent rock slope,taking the Zhuquedong Landslide along Changji Expressway as an example,a combination of geological survey,literature inquiry,theoretical analysis,and physical simulation was used.First,the basic characteristics and the formation mechanism of the landslide are studied in detail.Then the mechanical model of slipping-bending is established,and the deformation condition discrimination and the stability evaluation are carried out.Based on it,the physical model test was used to reproduce the evolution process of slope deformation and destruction,and the genetic formation of slipping-bending deformation and failure was further verified.The results show that the consequent slope with gentle inclination can produce the slipping-bending deformation.The similar landslides have characteristics of strong concealment,huge volume,sliding surface with steep behind and gentle ahead,multi-layer sliding,suddenness,high speed and limited sliding distance.The necessary conditions for the slipping-bending deformation of the consequent slope are terrane inclination angle of 20°~60°,alternating soft and hard layers,plenty of joints and cracks,the dip angle greater than the angle of slope,the slope length up to hundreds of meters,and the residual sliding force of rock mass greater than its critical value.The related research methods and results are of great value for the systematic evaluation of consequent rock slope stability.

关 键 词：顺层岩质斜坡 滑移-弯曲 力学分析 物理模拟 

分 类 号：P642.22[天文地球—工程地质学]