基于BOTDR的预制桩应变-温度联合测试方法研究  

Research on Strain-temperature Joint Test Methods of Precast Piles by Using BOTDR

作　　者：席均[1] 施斌[1] 魏广庆[1] 卢毅[1] 

机构地区：[1]南京大学光电传感工程监测中心,南京210093

出　　处：《防灾减灾工程学报》2012年第3期281-286,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2011CB710605)资助

摘　　要：提出了一种可以实现分布式应变-温度联合测试的方法,采用特殊封装的方法改变传感光缆的频移系数,用于空间差异式分布的温度补偿。通过预制桩浸水试验对该方法的有效性进行验证,采用该方法对监测数据进行温度补偿,对应变、温度沿桩身的分布规律以及随时间的变化规律进行了分析。研究表明:该应变-温度联合测试方法能够较好地解决温度在空间上差异式分布时的温度补偿问题;预制桩浸水试验中,水下渗导致的桩身温度变化较大,应变和温度2个因素对传感光缆上各点频移变化量的贡献比例关系较为复杂。This paper presents a distributed strain-temperature joint test method,which can be used for differently distributed temperature compensation by a special packaging way to switch sensing cable＇s frequency shift coefficient.The feasibility of this method is verified by a submerging test of precast piles.This method is used in the test for temperature compensation.The strain-temperature distribution law along the pile body and variation law are analyzed.The study shows that： firstly,the strain-temperature joint test method can solve the differently distributed temperature compensation problem preferably.Secondly,temperature in a submerging test of precast piles changes greatly due to the infiltration of water,so the contribution of strain and temperature to frequency shift is complicated.

关 键 词：布里渊光时域反射计(BOTDR) 温度补偿 预制桩 浸水试验 分布式测试 

分 类 号：TU473.13[建筑科学—结构工程]