Abstract:We use the relative calibration method, the four-component self-test analysis, the relative error calculation of M2 tidal factor, and the correlation comparison method with the observation data of TJ-2 volume borehole strain at the same station to calculate the internal accuracy of the instrument, the self-test situation, and the accuracy of M2 tidal factor before and after the probe replacement of RZB-2 borehole strain instrument at Zoucheng station from January 2020 to July 2021. We further comprehensively analyze the stability of the borehole component strain instrument observation system and the reliability of data quality. The analysis shows that after the sensor probe change, the data of RZB-2 borehole strain instrument at Zoucheng station have high precision. The two groups of surface strains conform to the four-component self-test equation, and the correlation coefficient is close to 1. The correlation between surface strain and volume borehole strain surface strain data is also close to 1, that the instrument observation system is normal and stable, and the data are reliable. However, due to the increase of a new factory workshop around the station in 2021, pumping interference increases, and the accuracy of the tidal factor of the data is poor, the average value is about 0.07. We suggest that environmental protection work should be actively done to reduce the pumping interference and improve the observation quality of the data.
XU Fangfang,ZHU Chenglin,JIA Yuan et al. Data Accuracy Evaluation of Borehole Strain before and after Change of Sensor Probe at Zoucheng Station[J]. jgg, 2022, 42(7): 755-759.