复杂荷载下斜坡桩基承载力数值模拟研究

Study on Numerical Simulation of Bearing Capacity of Pile Foundation on Slopeunder Complex Load

针对斜坡桩基受陡坡作用影响桩基前后土体不对称,侧摩阻力有所不同,容易产生安全隐患问题,对复杂荷载下斜坡桩基承载力进行数值模拟研究。在复杂荷载作用下获取水平受荷桩的挠度微分方程,采用有限单元法确定桩周土抗力及与其对应的桩身位移关系;建立数值分析模型,对桩基模型实施网格划分,计算出桩体和土体的各项参数,分析不同坡度、邻坡距和桩长条件下桩基极限承载力的变化规律和影响因素,利用数值模型确定极限上拔承载力。结果表明:在复杂荷载下,获得不同位置桩身弯矩和土体模量对桩身弯矩的改变,可通过改善土的模量提高桩的水平承载力。

In view of the fact that the slope pile foundation is affected by the steep slope,the front and back of the pile are not symmetrical,the lateral friction resistance of the pile foundation is different,and it is easy to cause hidden safety problems.A numerical simulation study on the bearing capacity of slope pile foundation under complex load is proposed.First,the deflection differential equation of the horizontally loaded pile is obtained under complex load,and the finite element method is used to determine the soil resistance around the pile and the corresponding displacement relationship of the pile body.Establish a numerical analysis model,implement grid division on the pile foundation model,calculate various parameters of the pile body and the soil body,and analyze the variation law and influencing factors of the ultimate bearing capacity of the pile foundation under the conditions of different slopes,adjacent slope distances and pile lengths,use the numerical model to determine the ultimate pull-up bearing capacity.The results show that under complex loads,the changes in the pile body bending moment and soil body modulus at different positions can be obtained,and the horizontal bearing capacity of the pile can be improved by improving the soil modulus.