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采用ABAQUS软件,建立桩锚整体式支护结构和桩锚分离式支护结构有限元模型,分析二者受力性能差异,研究桩径、嵌固深度、冠梁尺寸、锚杆数量以及预应力等对其受力性能的影响。结果表明:两类支护结构位移由两端向中间减小,弯矩和剪力则由两端向中间增大,中间部分受力和变形保持一致;设计时应将端部两根抗滑桩的弯矩和剪力分别乘以1.35和1.2的承载力调整系数;桩锚整体式支护结构的最大位移比分离式结构小20%以上,最大弯矩小3%以上,最大剪力小6%以上;增大抗滑桩桩径,两类支护结构的位移和弯矩均减小;增大抗滑桩嵌固深度,两类支护结构的位移减小,但弯矩增大;冠梁尺寸增大可提高支护结构整体刚度和抗变形能力,但作用有限;增加锚杆数量、施加预应力均可显著减小抗滑桩的位移和弯矩,并改变位移和弯矩沿桩身的分布形态;以上参数变化对整体式支护结构的影响要远小于分离式支护结构。
The ABAQUS software is used to establish the finite element model of the integral supporting structure of pile anchor and the separate supporting structure of pile and anchor, analyzing the difference of the mechanical performance of the pile and the pile, studying the pile diameter, the depth of the embedded beam, the size of the crown beam, Such as its impact on the performance of the force. The results show that the displacements of two types of supporting structures decrease from the two ends to the middle, the bending moment and the shear force increase from the two ends to the middle, and the stress and deformation of the middle part keep the same. Pile bending moment and shear force are respectively multiplied by the bearing capacity adjustment coefficient of 1.35 and 1.2 respectively. The maximum displacement of the integral anchor-pylon structure is 20% less than that of the separated structure, the maximum bending moment is less than 3% and the maximum shear force is small 6%. When the anti-slide pile diameter is increased, the displacement and bending moment of both types of support structures decrease. When the depth of anti-slide pile is increased, the displacement of two kinds of support structures decreases, but the bending moment increases ; The increase of the size of the crown beam can improve the overall stiffness and deformation resistance capacity of the support structure, but the effect is limited; increasing the number of anchor bolts and prestressing can significantly reduce the displacement and bending moment of anti-slide pile and change the displacement and moment Along the pile body distribution; the above parameters of the impact of the overall support structure is much smaller than the separate support structure.