注浆钢管微型桩加固滑坡的试验研究

Model Test on Application of Grouting Steel-Tube Micropiles to Landslide Reinforcement

为探讨注浆钢管微型桩对滑坡的加固机理,通过离心模型试验,分别从坡顶位移、坡面位移及坡内部位移分析了注浆钢管微型桩对滑坡的控制效果,并讨论了钢管微型桩的受力特征.试验结果表明:注浆钢管微型桩能有效地控制边坡土体位移,阻止滑坡的产生,防止圆弧型滑裂带的形成,仅坡体表面局部浅层形成裂纹;前桩所受的最大土压力约为后桩的13.3%,表明后桩承受较大的滑坡推力;加固过程中,前桩的弯矩曲线由反S型逐渐变为S型,而后桩的弯矩曲线一直呈S型.

In order to investigate the reinforcing mechanism of grouting steel-tube micropiles on landslide,their control effects were analyzed from the displacements of slope top,slope surface and slope body through centrifugal model tests.The force characteristics of steel-tube micropiles reinforcing landslide were analyzed.The experimental results show that grouting steel-tube micropiles can effectively control the displacement of slope soil and prevent the generation of landslide,and only local shallow cracks are formed on the surface of slope.The maximum soil pressure on an anterior pile is 13.3% of the maximum soil pressure on a posterior pile to show that posterior piles bear large landslide thrust.The bending moment curve for an anterior pile changes from a reverse S-shape to an S-shape in the refinement process,while the bending moment curve for a posterior pile is S-shaped.