“品”字型抗滑桩有限元计算方法及工程应用

Finite element calculation method and engineering application of the three piles of facing each other

通过对抗滑桩在滑坡防治治理工程中的应用研究,首先提出了一种新型组合式"品"字型抗滑桩,此抗滑桩由三根单桩通过桩顶连梁连接组合成空间结构,此结构具有刚度大、变形小的特点。其次建立了此抗滑结构的空间杆系有限元计算模型,将桩间土视为薄压缩土层,并以水平向弹簧来代替,桩侧摩阻力通过桩土界面传递函数来考虑。最后此抗滑结构在舟曲锁儿头滑坡得到了应用并进行了现场试验,试验结果表明:前排桩桩身弯矩约占后排桩桩身弯矩值的30%,且后排两根桩的桩身弯矩不等,此结构产生了扭转变形并且能够应用在滑坡推力主轴线难以确定的滑坡治理工程中,具有很好的应用价值。

By the application study on the anti-slide pile in landslide control project,the novel modular three piles of facing each other are proposed. The anti-slide piles are composed of three piles which are connected by pile cap beam and formed the spatial structure,and this structure has the characteristics of strong stiffness and small deformation. The space truss finite element model of this anti-silde structure is presented in this paper,and the soil between piles is regarded as a thin compressible layer and instead of horizontal ring connecting piles. The pile lateral friction is considered by transfer function of pile-soil interface. Finally,this anti-slide structure has been applied to Suoertou landslide in Zhouqu county and the field tests are carried out. The results show that the body moment of the front pile is about 30% of the one of back pile body and the pile body moments of the back two piles are unlikeness. The torsion deformation is produced in this structure,which can be used in the landslide where is difficult to determine the main axis of landslide,and this structure is of good application value.