一种单侧堆载作用下桩基侧向位移计算方法

Calculation Method of Lateral Displacement of Pile Under Single-side Surcharge Load

基于Flamant解推导了梯形荷载作用下桩侧附加土压力计算式,引入Pasternak双参数地基模型构建了桩身挠曲微分方程.采用有限差分法求解该方程,可得到桩身侧向位移.以两个项目为背景,对比各方法计算所得结果.结果表明:算例一中各方法所得侧向位移值随着深度增加均呈现出先增大后减小的趋势,最大值出现在桩身1/5~1/3范围内;算例二中计算值与实测值在桩顶处相差6.4 mm,误差约为6%.

Based on Flamant solution,the formula of additional soil pressure gauge on the pile side under trapezoidal load was derived,and the differential equation of pile deflection was constructed by introducing Pasternak two-parameter foundation model.The lateral displacement of the pile can be obtained by solving the equation with finite difference method.Taking two projects as the background,the results calculated by each method were compared.The results show that the lateral displacement values obtained by each method in Example 1 show a trend of increasing first and then decreasing with the increase of depth,and the maximum value appears in the range of 1/5~1/3 of the pile body.The difference between the calculated value and the measured value in the second example is 6.4 mm at the top of the pile,and the error is about 6%.