圆形大截面抗滑桩在高速公路丘陵斜坡地带滑坡工程中的应用  

Application of Circular Large Section Anti-slide Pile in Landslide Engineering of Hilly Slope Area of Expressway

作　　者：曾玲升 肖强 郭凯斌 ZENG Ling-sheng;XIAO Qiang;GUO Kai-bin(Jiangxi Communications Design and Research Institute Co.,Ltd.,Nanchang,Jiangxi 330100,China)

机构地区：[1]江西省交通设计研究院有限责任公司,江西南昌330100

出　　处：《黑龙江交通科技》2023年第12期1-4,10,共5页Communications Science and Technology Heilongjiang

摘　　要：针对宜春至遂川高速公路在开挖时在连续强降雨极端天气发生的滑坡,进行了路基滑坡变形破坏特征及物质结构特性调研,运用简化Bishop法和极限平衡理论对滑坡坡体进行稳定性验算,得出坡体下滑力,后基于上述计算结果建立midas三维模型,研究天然、暴雨2种工况时滑坡推力,对失稳坡体进行抗滑桩的设计和验算。结果表明:(1)暴雨工况较天然工况滑坡推力更大;(2)滑坡推力在抗滑桩桩身会产生较大的弯矩和剪力,应根据剩余下滑力合理设置抗滑桩的位置及根数;(3)设计时应根据抗滑桩所受弯矩和剪力分布充分考虑其配筋率以及钢筋布置,以免造成抗滑桩自身的破坏。Aiming at the landslide occurred in the extreme weather of continuous heavy rainfall during the excavation of Yichun to Suichuan Expressway,the deformation and failure characteristics and material structure characteristics of the subgrade landslide were investigated.The simplified Bishop method and the limit equilibrium theory were used to check the stability of the landslide slope,and the sliding force of the slope was obtained.Based on the above calculation results,the midas 3D model was established to study the landslide thrust under natural and rainstorm conditions,and the anti-slide pile was designed and checked for the unstable slope.The results show that:(1)the landslide thrust under rainstorm condition is greater than that under natural condition;(2)landslide thrust will produce large bending moment and shear force in the anti-slide pile,so the position of anti-slide pile should be set reasonably according to the residual sliding force;(3)The reinforcement ratio and arrangement should be fully considered in the design according to the bending moment and shear force distribution of the anti-slide pile,so as to avoid the damage of the anti-slide pile itself.

关 键 词：圆形大截面抗滑桩 丘陵斜坡 路堑滑坡 

分 类 号：U418.55[交通运输工程—道路与铁道工程]