滑坡治理中箱型竖向曲线预应力抗滑桩的机理研究

Study on the mechanism of anti slide pile box type landslide vertical curve prestressed

通过建立普通结构、箱型钢筋混凝土和箱型竖向预应力三种抗滑桩进行有限元计算对比分析。首先施加2000 kN滑坡推力作用,分析其位移、弯矩和剪力等指标变化,得出箱型预应力抗滑桩位移和正弯矩比其它两种抗滑桩相对减小,但适当增加了两端负弯矩,说明箱型竖向预应力抗滑桩在位移和抗弯方面有着明显的抗滑优势;其次,在此基础上根据弯矩剪力变化情况,对预应力布设形式进一步优化,将抗滑桩两端布设成曲线形式,通过五种形式的不断调整,两端采用曲线预应力桩的两端负弯矩和剪力减小,滑面处最大正弯矩和最大正剪力几乎不变,说明抗滑桩两端采用曲线预应力更加科学合理并符合抗滑桩的受力要求;最后,通过对于抗滑桩预应力加载进行模拟,预应力筋加载并不是越大越好,还必须选择适当的力进行加载。通过以上说明同时利用箱型固有结构和体内预应力特性,确保提高抗滑稳定有积极作用,值得诸位专家学者进一步研究推广。

this through the establishment of a new anti slide pile structure model,finite element analysis compared with those of traditional anti slide pile,displacement,internal force through changes in other indicators,the box type prestressed anti slide pile has obvious anti slide advantage,and save material,reduce cost of great significance,on the basis of bending changes further optimization of prestress,the layout,the anti slide pile are laid into a curve,so that the two ends of the pile negative moment becomes small,the anti slide pile with prestressed ends curve more scientific and reasonable and in line with the requirements of stress resistance slide pile,the box type natural structure and internal prestressed characteristics,in reducing the prestress loss do the landslide body,drainage,monitoring and maintain the use of box type structure,and further improve the anti sliding effect,which has a more positive effect of landslide is stable for a long time,is worth your experts to further clinical study.