关键词: 振弦式渗压计, 零点漂移, 人工比测, 误差

Abstract: In order to study the long-term stability of vibrating wire piezometer commonly used in safety monitoring of geotechnical projects, the data of automatic monitoring of vibrating wire piezometer and manual measurement for 12 years in a project are analyzed. Through correlation analysis and standard deviation analysis, it is considered that the measurement accuracy, long-term stability and permissible service life of the vibrating wire piezometer can meet the needs of seepage monitoring. It is suggested that the corresponding management system should be established in the long-term use of the vibrating wire piezometer, the manual measurement comparison should be insisted, and the abnormal condition should be corrected in time. After the automation system is put into operation, the frequency of manual measurement can be reduced year by year. Monitoring data analysis of a vibrating wire piezometer in another project for 6 years shows that the typical zero shift presents a trend of decreasing frequency modulus, which can be found by manual comparison or obvious abnormal water level. At this point, the piezometer should be replaced in time.

Key words: vibrating wire piezometer, zero shift, manual measurement, error