某厚层碎石土滑坡滑面判定及防治对策

Determination of the slip surface of a thick gravel soil landslide and the prevention and control strategy

碎石土滑坡防治的难点是对其滑动面的准确判定。以大漾云高速公路K14+030—K14+130段左侧厚层碎石土滑坡为例,在地面调查、钻探、原位测试、室内试验、稳定性分析等基础上,充分查明了滑坡范围内地质结构特征及滑坡的成因机制,对碎石土类滑坡稳定性影响最大的因素是地震。对碎石土层中滑动面进行了综合判定,滑坡体颜色为褐黄色,碎石成分以小粒泾碎石为主,同时密实度呈松散状,钻孔岩心有明显擦痕,碎石颗粒有定向排列趋势。在此基础上,经过方案比选,最终提出双排抗滑桩+锚索框格梁边坡防护+截水沟的防治方案,该方案达到了良好的治理效果。研究结果对类似厚层碎石土滑坡滑面判定及防治对策研究具有借鉴意义。

The difficulty of gravel soil landslide prevention and control is the accurate determination of its slip surface.Taking the thick gravel soil landslide on the left side of K14+030—K14+130 section of Dayangyun Expressway as an example,the authors fully identified the characteristics of the geological structure within the scope of the landslide and the mechanism of landslide genesis,on the basis of ground investigation,drilling,in-situ test,indoor test and stability analysis.The most important factor affecting the stability of gravel soil landslide is earthquake.The slip surface in the gravel soil layer was comprehensively investigated.The color of the slope is brown yellow,the graved is mainly in small particle size,and the density is loose.The drilling core has obvious scratches,and the gravel particles have a directional arrangement trend.The prevention and control strategy of double-row anti-slip piles+anchor cable frame lattice beam slope protection+interceptor ditch was finally proposed after selection,and this strategy achieved good management effect.The results of this study could provide some reference for the determination of the slip surface of similar thick gravel soil landslides and the study of prevention and control strategy.