圆形抗滑桩在隧道洞口滑坡应急处理中的应用

Application of Circular Anti-slide Pile in Emergency Treatment of Landslide at Tunnel Portal

以四川某国道在建一级公路牛项颈隧道进口滑坡应急处理工程为例,基于滑坡工程地质条件,进行滑坡成因分析和推力计算,并在对圆形抗滑桩和矩形抗滑桩从受力特征、施工工期、施工安全和工程造价等方面进行综合对比分析的基础上,提出了采用机械成孔圆形抗滑桩的滑坡应急处理方案。工程实践表明,采用机械成孔圆形抗滑桩对隧道洞口滑坡进行处治的方案是安全可行的,相对于人工挖孔矩形抗滑桩,采用机械成孔圆形抗滑桩具有施工快、施工安全风险小的特点,在滑坡应急处治中具有较为明显的优势,值得推广应用。

Taking the landslide emergency treatment project at the entrance of Niuxiangjing tunnel of a national highway under construction in Sichuan as an example,based on the engineering geological conditions of landslide,this paper analyzes the causes of landslide and calculates the thrust.Based on the comprehensive comparative analysis of circular anti slide pile and rectangular anti slide pile from the aspects of stress characteristics,construction period,construction safety and project cost,this paper puts forward the landslide emergency treatment scheme of mechanically perforated circular anti slide pile.The engineering practice shows that the scheme of treating the landslide at the tunnel entrance with mechanical hole forming circular anti slide pile is safe and feasible.Compared with the manual hole digging rectangular anti slide pile,the mechanical hole forming circular anti slide pile has the characteristics of fast construction and low construction safety risk.It has obvious advantages in the emergency treatment of landslide and is worthy of popularization and application.