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土压力传感器在边坡防护等岩土工程中广泛应用,其测量的准确度受到多种因素影响,其中标定方式和土壤介质情况的差异对传感器测量结果的准确性有重要影响。以膜片结构光纤Bragg光栅土压传感器为研究对象,采用与传感器工作环境相近的各种砂土介质进行压力实验。实验结果表明:土壤环境不均匀大小的颗粒介质以及其分布状况对传感器测量结果有很大影响,鉴于该实验结果,我们提出了一种不受外部压力分布方式影响的土压力传感器,并做出初步的压力试验验证,实验结果表明该传感器测量值与载荷作用方式无关,解决了该类传感器在工程应用中因土壤环境不同而带来的测量不准确的问题。
Soil pressure sensors are widely used in geotechnical engineering such as slope protection. The accuracy of measurement is affected by many factors. The difference between calibration method and soil medium has an important influence on the accuracy of sensor measurements. Taking the patch-structured fiber Bragg grating soil pressure sensor as the research object, pressure experiments were carried out using various sand media with similar working environment to the sensor. The experimental results show that the granular media with uneven soil environment and its distribution have a great influence on the measurement results of the sensor. In view of the experimental results, we propose an earth pressure sensor that is not influenced by the external pressure distribution and make The preliminary pressure test shows that the measured value of the sensor has nothing to do with the mode of load action, which solves the problem of inaccurate measurement of the sensor due to different soil environments in engineering applications.