利用支护桩水平监测位移确定桩身弯矩的方法

AMethod to Determine Bending Moment in Retaining Pile Using Its Measured Horizontal Displacement

利用现场监测资料确定支护桩的截面弯矩对判断桩的安全状态和完善深基坑设计方法具有重要价值,但目前的确定方法不仅监测过程复杂,而且间接换算出的弯矩也可能与实际相差较大。本文将支护桩的水平监测位移看作三次样条函数,建立了一个确定桩身截面弯矩的计算方法。将该方法应用于某实际工程的结果表明,它不仅能够较为准确地确定支护桩的最大截面弯矩,而且也可以较好地反映整个桩身的弯矩分布。

The using of on-site monitoring data to determine the section bending moment of supporting pile is of great value to determine the safety state of the pile and to improve the design method of deep foundation pit.However,the current determining method has the disadvantages that the monitoring process is complicated,and the bending moment converted indirectly may also differ greatly from the actual one.In the paper,the horizontal monitoring displacement of the supporting pile is regarded as a cubic spline function,and a calculation method for determining the bending moment of the pile section is established.The result of applying this method to an actual project shows that it is not only able to determine the maximum section bending moment of the supporting pilemore accurately,but also to reflect the bending moment distribution of thewhole pile body.