
2016年12月,第22卷,第4期,724-732页
Dec 2016,Vol.22,No.4, pp.724732 DOI: 10.16108/j.issn10067493.2016165
高校地质学报
Geological Journal of China Universities
深基坑支护桩布里渊光时域分布式监测方法研究
索文斌,程刚,卢毅,孙义杰,施斌
1.南京大学地球科学与工程学院,南京210093;
2.国土资源部地裂缝地质灾害重点实验室(江苏省地质调查研究院),南京210049:
3.南京工业大学交通运输工程学院,南京211800
捕要:支护桩是深基坑支护结构中的关键组成部分,其支护效果直接影响到深基坑的稳定性,因此对支护桩应力应变状态的监测十分重要。该文选择了一种能够单端测量的分布式光纤感测技术一布里渊光时域反射计(简称BOTDR),将其应用于深基坑支护桩的变形监测,介绍了这一技术的基本原理、需解决的关键间题及实施技术路线,并结合南京某深基坑工程,验证了这一技术方法的监测效果。结果表明,基于BOTDR的监测方法可以对深基坑支护桩进行全分布式监测,方法可行,结果准确,为深基坑支护桩监测提供了一种新的技术手段。
关键词:支护桩;分布式光纤感测技术;深基坑;BOTDR;监测方法
中图分类号:P642
文献标识码:A
文章编号:10067493(2016)04072409
StudyonDistributedMonitoringMethodofDeepFoundationPit
RetainingPileBasedontheBrillouinOpticalTimeDomainTechnology
SUO Wenbin', CHENG Gang', LU Yi, SUN Yijie", SHI Bin'*
1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China
2. Key laboratory of Earth fissures Geological disaster, Ministry of Land and Resources, Geological Survey of Jiangsu Province, 210049, China
3. College of Transporlation Science & Engineering, Nanjing Tech University, Nanjing, 211800, China
Abstract: Retaining pile is a key part of bracing and retaining structures which directly affect the stability of deep foundation pit. Therefore, it is important to monitor the strain and stress state of a retaining pile. In this paper, the single-ended detecting distributed optical fiber sensing technology based on the Brillouin Optieal Time-Domain Refleetomeler (BOTDR) was used for monitoring the deformation of a PHC type retaining pile in a deep foundation pit. The monitoring method was described and its effectiveness was well verified in a deep foundation pit in Nanjing, The results indicate that the BOTDRbased method is feasible to make a fully-distributed monitoring of the retaining pile in the deep foundation pit. It is expected to be a novel way for monitoring deep foundation pit.
Key words: Retaining pile; distributed fiber optical sensing (DFOS); deep foundation pit; BOTDR; monitoring method Corresponding author: SHI Bin, Professor; E-mail: shibin@nju.edu.cn
且失稳将会给工程本身以及周边环境带来不可挽
支护桩是深基坑支护结构的关键组成部分,
其支护效果直接影响到深基坑的稳定性,基坑一收稿日期:20160831;修回日期:2016-1010
回的损失(张旷成和季继民,2010:郑刚等,
基金项目:国家重大科研仪器研制项目(41427801):国土资源部公益性行业专项(201511055);国土资源部地裂缝地质灾害重点实验室开放课题
(201401)联合资助
作者简介:索文斌,男,1980年生,博土研究生,地质工程专业;E-mail:swhin@nju.eda.cn
+通讯作者:施试。教授;E-mail:shibin@nju.edu.cn