支盘桩抗拔承载特性分析

Analysis of Anti-Pulling Behaviors of Pile with Branch Plates

支盘桩是一种新桩型,近年来在工程中得到比较广泛的应用,但对于支盘桩的研究多集中在受压承载特性,其抗拔承载特性的研究成果较少,在理论研究上还不够成熟,因此采用Abaqus软件,考虑了初始应力场,桩土之间的非线性接触以及土体材料的非线性,研究了支盘桩在上拔荷载作用下的承载特性,分析表明:在天然状态下土体对桩体的压力在支盘处最大,支盘桩达到抗拔极限承载力时,桩身轴力在支盘的上下出现突变,支盘下斜面以及桩底与土体产生了分离,塑性应变主要发生在支盘上的土体中;研究成果可为支盘桩的设计提供一定的理论依据。

The pile with branch plate is a new type of pile,widely used in engineering practice recently,but the study on the pile with branch plate focuses only on its compressive behaviors,there have been fewer studies on its anti-pulling behaviors,and the theory about this type of piles has not fully developed.Using software ABAQUS,the paper has studied the anti-pulling behaviors of pile with branch plates by considering the nonlinear contact between pile and soil,the initial stress field and the nonlinearity of soil material.The analysis shows that the soil pressure imposed on the pile was the largest at the branch plate under the natural condition,when the bearing capacity of pile with branch plates reached to the limit,the axial force of pile had mutations at the upper and lower of the branch plate,the lower slope of branch plate and soil produced a separation also between pile bottom and soil,the plastic strain occurred mainly in the upside of branch plate.The research results can provide some theoretical basis for the design of the pile with branch plate.