基于分布式光纤监测技术的板桩码头试验研究

Experimental study of sheet pile wharf based on distributed optical fiber monitoring technology

板桩码头桩体结构受力变形状态是评价其安全运行的重要指标。基于分布式光纤模型试验,提出了一种新型桩体受力和变形分布式监测技术,并成功应用于板桩码头钢筋混凝土灌注桩原型试验研究中。结果表明该方法能够准确反映港池开挖过程中板桩码头桩体结构变形、弯矩和受力等分布变化规律,并能及时对板桩码头的运行及施工情况进行有效监测评估,可以为板桩码头的持续稳定运行提供安全保障及施工指导。该监测技术能够克服传统点式监测方法分辨率及准确度不足的缺点,实现桩长范围内全深度及施工过程全周期的实时监测,具有一定的工程实用价值。

The stress and deformation state of the sheet pile wharf is an important factor to evaluate its safe operation.This paper presents a new distributed optical fiber monitoring technology for stress and deformation of piles based on the model test,which has been successfully applied to the prototype test of reinforced concrete cast-in-situ piles for sheet pile wharf.The results show that this method can accurately reflect the distribution of deformation,bending moment and stress along the pile length during the whole process of harbor basin excavation.It can effectively monitor and evaluate the operation and construction conditions in time,which can provide safety guarantee and construction guidance for the continuous stable operation of the sheet pile wharf.This monitoring method can realize the real-time monitoring for pile structure in full depth and full period of construction,thereby overcoming the shortcomings of traditional point monitoring methods in terms of resolution and accuracy,which has certain engineering practical significance.