预应力管桩桩-土动力p-y曲线研究

摘要

通过有限元软件ABAQUS建立以振动台试验为基础的数值模型来研究桩-土水平位移的变化规律。并使用P- Y 曲线法分别对预应力管桩在不同加速度峰值、不同桩型以及不同土体类别的条件下桩与土的变形进行了研究。研究表明，随着地震加速度峰值的增大，淤泥质粘土地区的桩侧土体以及桩身都会提前出现破坏。两桩、三桩、四桩桩身水平位移随着水平荷载的增大变化较单桩变化大，在相同水平地震荷载作用下，桩数越多，水平位移变化越大，其中三桩和四桩位移变化规律接近，四桩具有承受较强地震荷载的受力性能，体现了群桩受力的优势。%The displacement variation of pile-soil horizontal is studied by using the finite element software ABAQUS to set the shaking table test of the numerical model. The deformations between the prestressed piles and soil under the conditions of different peak acceleration, different types of piles and different soil categories are researched by the P-Y curves. The study results show that with the increasing of the peak of earthquake acceleration, pile side soil and the pile body in silty clay area will appear destruction ahead. With the increasing of the horizontal loads, the horizontal displacement changes of the piles such as two-pile, three-piles and four-pile are bigger than that of the single pile. Under the same horizontal seismic loads, the more piles there are, the greater horizontal displacement of the piles changes. Among them, the displacement variation of two-pile is close to that of three-pile. Four-pile could withstand the strongest seismic loading force in the four kinds of piles, and its performance reflects the advantages of pile group.