中文摘要：

研究目的：传统抗滑桩采用人工挖孔施工，工期长并且混凝土圬工量大，难以用于路堑边坡快速加固，为 此采用钻孔微型桩对广（元）~巴（中）高速公路K51路堑边坡病害进行治理，本文介绍微型桩加固工程概况 及设计参数，并采用数值分析手段对带承台微型抗滑桩加固单元的加固机理进行分析。研究结论：（ 1）作用在微型抗滑桩上的推力近似呈三角形分布，并且微型抗滑桩加固单元内各排桩受力 具有不均匀性；（2）侧向挤压作用下各排桩的受力机制差别不大，剪力和弯矩峰值随边界位移不同位置略有 差异，模型试验与计算结果均表明，微型抗滑桩加固边坡的破坏模式为沿潜在滑面所产生的整体滑移；（3）承 载力分析结果表明，微型抗滑桩加固单元的极限抗滑力大于设计下滑力，表明K51工点边坡选用微型抗滑桩 加固方案代替原重力式挡墙是可行的，能够确保被加固边坡的安全；（4）该研究成果可为微型桩在山区边坡 （滑坡）加固中的工程应用提供理论指导。

英文摘要：

Research purposes： The traditional anti - slide piles are constructed by manual excavation, with long construction period and large amount of concrete masonry. It is difficult to be used for rapid reinforcement of road cutting slopes. For this purpose, the drilled micropiles are adopted in the K51 cutting slope of Guangyuan - Bazhong expressway. The general situation and design parameters of micropiles reinforcement engineering are introduced,and the reinforcing mechanism of micropiles with cap beam is analyzed by a series of numerical simulation. Research conclusions：（ 1） The thrust acting on the micropiles is approximately triangular distribution,and the thrust on each row of piles in the system is not uniform. （2） The action mechanism of each row of piles in the system is similar under lateral extrusion, and the peak value of shear force and bending moment slightly with different positions with boundary displacement. The model test and calculation results show that the failure modes of the reinforced slopes are the whole slip along the potential slip surface. （3） The results of bearing capacity analysis show that the ultimate anti - sliding force of the micropiles is greater than the designed value,which indicates that it is reasonable to use the micropiles to replace the original gravity retaining wall. （4） The research results can provide a useful basis for applications of micropiles in slope and landslide reinforcing in mountainous area.