微型桩处置堆积层滑坡室内模型试验研究

通过微型桩分别加固黄土、膨胀土堆积层滑坡的物理模型试验，研究了加固两类滑坡时微型桩的作用机理以及受力变形的差异。分析微型桩试验监测数据，以桩顶位移作为主要考虑因素，同时兼顾桩前土压力和桩身弯矩的比例关系，给出了便于设计加固方案时采用的参照系数及其取值范围。研究结果表明：当桩顶位移过大时，滑面处桩身弯矩迅速增大直至桩体破坏失效；在相同桩间距、排间距、锚固深度和布设形式的情况下，微型桩加固两类滑坡的参照系数在1.45~2.45间取值。 〖HT5”H〗关〓键〓词：〖HT5”K〗

Indoor model test study on reinforcing colluvial?slope with micro-pile

The physical model tests on loess and expansive soil colluvial?slope reinforced by micro-pile were carried out respectively. The reinforcing mechanism and the bearing deformation difference of micro-pile are studied for the two types of landslides. Taking pile top displacement as the main factor and considering relationship between the soil pressure in front of pile and the bending moment of pile, we propose a reference coefficient that could be applied in design of micro-pile reinforcement. The results show that when the pile top displacement is too large, the bending moment of pile near the sliding surface increases rapidly until the piles fail. Under the same pile spacing, row spacing, anchoring depth and layout form, the reference coefficient of the two types of landslides is 1.45 to 2.45.