双层地基中倾斜受荷桩承载特性数值分析

Numerical Analysis of Bearing Behavior of Inclined Loaded Pile in Double-layered Soil

为探讨上黏下砂和上砂下黏双层地基中倾斜受荷单桩承载特性,首先基于ABAQUS建立上黏下砂与上砂下黏双层地基中长径比L/D=5和10的倾斜受荷桩3D数值分析模型,在此基础上,采用位移控制法,得到了相应工况下单桩的竖向和水平极限承载力,并运用probe法计算获得了上黏下砂及上砂下黏地基土工况下长径比L/D=5和10的桩的桩身承载力包络线。通过对上述双层地基工况下的单桩(L/D=5和10)施加与桩轴线成0°、30°、45°、60°的桩顶倾斜荷载,得到了桩身水平位移曲线、桩侧土抗力分布规律以及双层地基中上下土层的层厚比、倾斜荷载倾角、倾斜荷载大小、桩身长径比L/D等对桩身承载力、桩身水平位移的影响特性。

To analyse theload-bearing characteristics of the inclined load-bearing single-pile in the sticky sand double layer foundation.A 3D finite element analysis model of inclination load piles( L/D =5 and 10)under sticky sand double layer foundationwasset up firstly by ABAQUS.Based on this,the vertical and horizontal ultimate bearing capacity of the single pile under the corresponding working conditions was obtained byusing the displacement control method in the upper soft clay lower sand and upper sand lower soft clay.Bearing capacity envelope of piles with L/D =5 and 10 under soil conditions with sand-bearing groundwas obtained by using the probe method.By applying the pile top inclined loads of 0°,30°,45°,and 60° to the pile's axis for the single pile ( L/D =5 and 10) under the above double-layer ground conditions,the horizontal displacement curve of the pile and the distribution law of resistance of pile side soil and the effect of the layer thickness ratio of the upper,lower soil layers in the double-layer foundation,inclined load angle,slant load,L/D ratio of length to diameter of the pile,and the horizontal displacement of the pile body is obtained.