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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 branch pile is a new type of pile, and has been widely used in engineering in recent years. However, the research on branch pile mostly focuses on the compression bearing characteristics, and the research results of its anti-pull bearing characteristics are few. In the theoretical research Therefore, using Abaqus software, the initial stress field, the nonlinear contact between pile and soil and the nonlinearity of soil material are taken into account. The bearing characteristics of branch pile under uplift load are studied. The results show that: Under natural conditions, the pressure of the soil body on the pile body is the largest at the support plate. When the support pile reaches the ultimate lifting capacity, the axial force of the pile body changes suddenly above and below the support plate. The lower bevel of the support plate, Resulting in the separation of plastic strain mainly occurs in the soil on the support plate; the research results can provide some theoretical basis for the design of the support pile.