悬臂式单锚抗滑桩加固黄土滑坡的模型试验

Model Test Study on the Reinforcement of Loess Landslide by Cantilever Single Anchor Anti-slide Pile

通过开展悬臂式单根锚杆抗滑桩加固黄土滑坡的室内模型试验,获得桩后滑坡推力、桩前土体抗力、桩体及锚杆的应力-应变情况,并据此研究了悬臂式单锚抗滑桩桩侧地层抗力、桩身内力分布规律及其破坏模式。结果表明:在滑坡推力作用下,悬臂式锚杆抗滑桩受荷段桩后受压、桩前受拉,而嵌固段桩后受拉、桩前受压,锚杆抗滑桩受力形式呈"S"曲线状;随着锚杆抗滑桩在荷载作用下的变形破坏,其桩前、桩后土压力分布规律也逐渐改变;悬臂式锚杆抗滑桩的破坏模式主要为塑性铰弯折破坏,而土体中锚杆的破坏模式主要为弯剪-滑移破坏。

This paper carries out an indoor model test to study on the reinforcement of loess landslide by cantilever single anchor anti-slide pile, and measures the landslide thrust after pile, soil resistance before pile ,stress-strain conditions of the pile and anchor and analyzes the strata resistance around piles, the in- ternal force distribution and failure modes of piles. The results show that under the action of landslide thrust, the loaded segment of anchor piles is in compression after piling and is in tension before piling, but the embedment segment is in tension after piling and is in compression before piling,the force form of the pile is ＂S＂ curve shape,with the deformation and destruction of the anchor pile under load,the distribution of the soil pressure before and after piling is also gradually changing. The failure mode of piles is plastic hinge bending failure, and the failure mode of anchors in soil is bending shear-slip failure.