基于光纤传感技术的基坑变形监测试验研究  

Experimental study on deformation monitoring of foundation pit based on optical fiber sensing technology

作　　者：杨振辉 翟乾智 董清志 杨力龙 Yang Zhenhui;Zhai Qianzhi;Dong Qingzhi;Yang Lilong(Henan Provincial Communications Planning&Design Institute Co.,Ltd.,Zhengzhou Henan 450015,China;State Key Laboratory of Shield Machine and Boring Technology,Zhengzhou Henan 450001,China)

机构地区：[1]河南省交通规划设计研究院股份有限公司,河南郑州450015 [2]盾构及掘进技术国家重点实验室,河南郑州450001

出　　处：《山西建筑》2024年第13期116-119,131,共5页Shanxi Architecture

摘　　要：对传统常规的基坑深层变形监测方法进行了分析,为实现更加精准、高效的基坑深层变形监测目的,对光纤传感技术在深层变形监测方面的应用进行了试验研究,基于布里渊光时域分析技术(BOTDA),改进了一套光纤传感装置,能同时满足光纤传感和传统测斜监测使用需求,并将其应用于马来西亚吉隆坡地铁二期大马城南站基坑深层变形监测的现场试验。结果表明,BOTDA能够进行垂直和平行于基坑两个方向的深层土体变形监测,达到了监测速度快、分布式测量的效果,有效解决了传统方法监测速度慢、离散测量的问题。The traditional conventional deep deformation monitoring method for foundation pits was analyzed.In order to achieve more efficient and accurate deep deformation monitoring of foundation pits,the application of optical fiber sensing technology in deep deformation monitoring was experimentally studied.Based on Brillouin Optical Time Domain Analysis(BOTDA),a set of optical fiber sensing devices was improved to meet the needs of both optical fiber sensing and traditional inclinometry monitoring,and applied to the field test of deep deformation monitoring of the foundation pit of Malaysia Kuala Lumpur Metro Phase II Malaysia City South Station.The results showed that BOTDA can monitor the deep soil deformation in two directions perpendicular and parallel to the foundation pit,achieving the effect of fast monitoring and distributed measurement,solving the problems of slow monitoring speed and discrete measurement in traditional methods.

关 键 词：光纤传感 BOTDA 深层变形监测 分布式测量 

分 类 号：TU454[建筑科学—岩土工程]