基于分布式光纤传感技术的深基坑坑底回弹监测应用研究

Research on the application of rebound monitoring of deep foundation pit bottom based on distributed optical fiber sensing technology

深基坑工程是一项危险系数大、受环境因素影响大的工程,坑底回弹作为深基坑监测中至关重要的一个测项,其监测难度较高,传统的监测方法难以实现精准、连续的监测,而分布式光纤具有监测精度高、可连续监测等优点,在很多基础工程中都有着广泛的应用。本文详细介绍了分布式光纤在基坑坑底回弹监测中的布设、数据采集、数据处理和分析。通过往返两段数据对比,其变形基本一致,验证了分布式光纤在深基坑坑底回弹监测中的可行性。

Deep foundation pit engineering is a large risk factor,greatly affected by environmental factors.Pit bottom rebound as a vital measurement item in the monitoring of deep foundation pit,its monitoring difficulty is high.Traditional monitoring methods are difficult to achieve accurate,continuous monitoring,and distributed optical fiber has the advantages of high monitoring accuracy and continuous monitoring,and has a wide range of applications in many basic projects.This paper introduced in detail the layout,data acquisition,data processing and analysis of distributed optical fiber in the rebound monitoring of the pit floor.Through the comparison of the two round-trip data,the deformation was basically the same,which verifyed the feasibility of distributed optical fiber in the rebound monitoring of deep foundation pits.