基于逆有限元的基坑围护桩等效水平位移监测方法

Monitoring method of equivalent horizontal displacement of foundation pit surrounding pile based on inverse finite element

针对传统工程测量方法在深基坑围护桩形变监测中存在的局限性,提出了一种基于逆有限元的应力等效几何形变监测方法。该方法通过获取围护桩钢筋笼的轴向应力,采用逆有限元算法建立相关关系模型,等效求解围护桩在受土体等压力下产生的几何形变,并且通过模拟和实例对模型进行验证。试验结果表明,在不同的工况下,逆有限元关系模型均能实现桩体位移量的等效转换,且具有很好的精确度和稳健性。本文方法弥补了传统监测方法在结构内部监测中的不足,为深基坑围护桩等地下空间变形监测提供了一种思路,对监测工作自动化与科学预测形变有积极的推动作用。

Aiming at the limitations of the traditional geodetic method in monitoring the deformation of the retaining piles in deep foundation pits,a stress-equivalent geometric deformation monitoring method based on inverse finite elements is proposed.The inverse finite element algorithm is used to establish the correlation model,and the geometric deformation of the retaining piles under the pressure of the soil is equivalently solved,and the model is verified by simulation and examples.The experimental results show that under different working conditions,the inverse finite element relationship model can realize the equivalent conversion of pile displacement,and has good accuracy and robustness.This method makes up for the deficiencies of traditional monitoring methods in internal monitoring of structures,provides a new idea for deformation monitoring of underground spaces such as retaining piles around deep foundation pits,and plays a positive role in promoting the automation of monitoring work and scientifically predicting deformation.