不同斜坡坡角对桩基水平承载特性试验研究与数值分析

Experimental study and numerical simulation of horizontal bearing behavior of pile foundation with different slope angles

通过室内模型试验,将模型桩分别埋设在斜坡坡角为15°、30°和45°斜坡中部,分析不同坡角对单桩水平承载力,桩身弯矩的影响;利用ABAQUS有限元分析软件分别建立15°、30°和45°斜坡模型,对斜坡上单桩在组合荷载作用下的承载特性进行数值模拟。结果表明:随着斜坡坡角的增加,桩后土压力随之增大,土体对桩的水平推力不断增大;进而桩顶水平位移增大,桩身弯矩也随之增大;不同加载顺序对水平承载特性产生影响,预先施加竖向荷载,可以提高单桩的水平承载力,预先施加水平荷载,再施加竖向荷载,对单桩的水平承载力不利。

The pile foundation in slope has to bear the vertical load transfer of the upper structure.It is also subjected to the thrust of the post-landfall slope.Through the indoor model test,the model piles were placed in the middle of slopes with slope angle 15,30 and 45 degrees,respectively.The effects of different slope angles on the horizontal bearing capacity and bending moment of single pile were evaluated.The 15°,30°and 45°slope models were all developed by ABAQUS finite element analysis software to simulate the bearing behavior of the single pile under the complicated load.The results showed that with the increase of slope angle,the earth pressure behind the piles were increased,which increased the horizontal thrust of the piles.It increased the horizontal displacement and bending moment of the pile.The different loading sequence has an effect on the horizontal load characteristics.The horizontal bearing capacity of a single pile can be improved by applying vertical load in advance.A horizontal load applied in advance followed by a vertical load adversely affects the horizontal bearing capacity of the single pile.