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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。
A method that can realize distributed strain-temperature joint test is proposed. The method of special package is used to change the frequency-shift coefficient of sensing optical cable for temperature compensation of spatial difference distribution. The validity of this method is verified by the precast pile immersion test. The temperature of the monitoring data is compensated by this method. The distribution of strain and temperature along the pile body and the variation with time are analyzed. The results show that the strain-temperature method can solve the problem of temperature compensation when the temperature is distributed spatially. In the pre-cast pile immersion test, the temperature of pile body caused by water infiltration is greatly changed. The strain and temperature 2 The ratio of the contribution of a factor to the variation of the frequency shift at each point on the sensing optical cable is more complicated.