中国铁道科学2017，Vol.38Issue(3)：10-18,9.DOI:10.3969/j.issn.1001-4632.2017.03.02
预应力锚索对微型桩结构抗滑性能影响的试验研究
Experimental Research on Effect of Prestressed Anchor Cable on Anti-Sliding Performance of Micropile Structure
摘要
Abstract
A new type of compound anti sliding system with retaining and anchoring effect,called "anchor cable micropile structure",was presented through setting oblique prestressed anchor cable on the connection beam at the top of traditional micropile structure.Two groups of model experiments,in which a soil slope was reinforced by the double-row traditional micropiles and anchor cable micropiles respectively,were designed and conducted by graded loading.Besides,the numerical calculation of same experimental conditions was also conducted by FLAC3D.Then,the deformation and stress characteristics of the slope reinforced by anchor cable micropiles,traditional micropiles and both of them were analyzed comparatively,and the anti-sliding mechanism of anchor cable micropiles was further studied.Results indicate that:compared with traditional micropile structure,the deformation of slope and the displacement of connection beam are obviously reduced after being reinforced by anchor cable micropiles.Stress concentration region distributes around anchor cable micropiles and a compound structure-soil skeleton is formed,the slip stress and deformation are prevented from transferring along the landslide direction.The lateral stiffness of the micropile structure is effectively enhanced by the prestressed anchor cable,and the lateral inclined deformation of the structure is decreased.The distribution of internal and external forces of micropiles tends to be uniform,which is advantageous to exert the mechanical properties of pile body timely and fully.With the gradual increase of load,the deformation process of micropile structure can be divided into three stages,including small deformation,large deformation and limit-equilibrium failure.Corresponding to the three stages above,the change law of load sharing ratio of pile over cable is increasing firstly,then decreasing and increasing again lastly,among which the ratio value of the last stage is roughly from 1.3 to 1.5.关键词
锚索微型桩/模型试验/抗滑性能/位移/弯矩/桩侧土压力/桩—锚荷载分担比Key words
Anchor cable micropile/Model test/Anti-sliding capacity/Displacement/Bending moment/Lateral earth pressure of pile/Load sharing ratio of pile over anchor分类
交通工程引用本文复制引用
胡田飞,朱本珍,刘建坤,郑静,梁龙龙..预应力锚索对微型桩结构抗滑性能影响的试验研究[J].中国铁道科学,2017,38(3):10-18,9.基金项目
科技部科研院所技术开发研究专项资金资助项目(2009EG123201) （2009EG123201）
铁道部科技研究开发计划项目(2010G018-C-3) （2010G018-C-3）
