注浆型圆形抗滑桩在松散层滑坡中的应用研究

Research on Application of Circular Grouting Anti-slide Pile in Unconsolidated Formation Landslide

为解决抗滑桩在松散层滑坡治理过程中抗滑性能不足等问题,对传统圆形抗滑桩结构进行改进,提出了一种注浆型圆形抗滑桩结构。该结构主要由钢护筒,注浆管,圆形抗滑桩主筋、箍筋等组成,为桩-土复合型结构,滑坡推力由抗滑桩与注浆结实体共同承担,具有防止垮孔,提高抗滑性能,稳固桩间岩土体等优点。在分析其结构特征及抗滑机理的基础上,通过理论推导,得出了注浆型圆形抗滑桩的设计计算公式。经过工程应用表明,注浆型圆形抗滑桩能有效降低桩侧应力,并使最大桩侧应力分布位置加深,从而弥补地基刚度的不足,对松散层滑坡治理有较强的适用性。

In order to solve the problems of poor performance of anti-slide caisson in the mitigation of potential landslide in the unconsolidated overburden soils,a post grouted circular anti-slide caisson structure is proposed to improve the performance of the traditional circular anti-slide caisson structure.The caisson structure is mainly composed of steel casing,grouting pipe,circular anti-slide caisson longitudinal reinforcement and circular stirrup.The post grouted caisson is a caisson-soil compound structure.The sliding force is carried by the anti-slide caisson and the adjacent grouted soils,which has the advantages of minimizing the borehole collapsing,improving anti-slide performance and stabilizing the geomaterial among caissons.The design approach of the post grouted circular anti-sliding caisson is also proposed in the paper.The engineering application shows that the post grouted circular anti-slide caisson can effectively reduce the lateral earth pressures of the caisson,lower the location of the maximum lateral earth pressures and improve the stiffness of overburden soils.