斜锚桩与抗滑桩联合支挡结构的参数敏感性有限元分析

Finite Element Analysis on Parameter Sensitivity of the Combined Retaining Structure of Inclined Anchor Pile and Anti-slide Pile

斜锚桩与抗滑桩联合支挡结构具有既能承受较大水平荷载,又能抵抗一定竖向变形的优点。运用数值模拟技术和强度折减法进行建模分析,对联合支挡结构的相关参数设置作出不同改变,如斜锚桩与水平方向夹角、桩径大小、锚固深度和桩间距等,研究了联合支挡结构的不同桩身参数对边坡稳定性产生的影响。计算结果表明:斜锚桩与水平方向的夹角宜为20°~45°,其锚固深度不宜过大且应嵌入理论破裂角以内稳定岩层不少于8 m,结构的桩间距宜为桩径的2~3倍。

The combined retaining structure of inclined anchor pile and anti-slide pile has the advantages of being able to with stand large horizontal loads and resist vertical deformation.In combination with the numerical simulation technology and the strength reduction method,the influence of the different parameters of the structure on the slope stability was studied by changing the relevant parameter settings of the joint retaining structure,such as the angle between the inclined anchor pile and the horizontal direction,the diameter of the pile,the anchorage depth and the pile spacing.The results show that the appropriate angle between the inclined pile and the horizontal direction should be between 20°and 45°,and the suitable anchoring depth should not be too large and must be embedded within the theoretical crushing angle with the stable rock layer of not less than 8 m.The optimal pile spacing of above structure should be 2 to 3 times of the pile diameter.