桩径对双排式钻孔抗滑桩的影响研究

针对治理推力较大的滑坡工程中常用双排抗滑桩,运用有限元程序ABAQUS建立双排式钻孔抗滑桩的有限元三维分析模型,在其它条件不变的情况下,分别改变模型中桩径,进行单因素分析。结果表明:在确定的桩间距和排间距下,桩径的变化,对双排式钻孔抗滑桩的桩的位移、内力、前后排桩承担滑坡推力的比例等均有影响;对桩身位移的影响尤其明显。桩径取值应有一个合适的范围,建议双排式钻孔抗滑桩桩径不宜小于1m,在施工条件可行的情况下,宜选择直径较大的钻孔抗滑桩;双排式钻孔抗滑桩具有施工安全、速度快、节省成本等优点,值得推广。

Study on Influence of Pile Diameter on Double-row Bored Anti-sliding Piles

For double-row anti-sliding piles that are often used to control landslide subject to large thrust, three-dimensional finite element model for double-row bored anti-sliding pile was established with ABAQUS, a a FEM software, and when other conditions did not change, univariate analysis was carried out by changing the pile diameters in the model respectively. The results show that, under defined pile and row spacings, the change of pile diameter has influence on the pile displacement, internal force, and the ratio of front and rear row of piles＇bearing landslide thrust, especially on the pile displacement ; the value of this pile diameter has a proper range and is recommended not to be less than 1 m and, under feasible construction conditions, it is better to choose the bored anti-sliding pile with relatively large diameter; this pile is of safe and fast construction and economical feature, thus worthy to be promoted.