Abstract
A hydrostatic leveling system (HLS) is an automated high-accuracy measurement technology widely used for vertical displacement monitoring. This paper focuses on evaluating the performance of HLS for monitoring the deformation of a power transmission tower base together with a slope sensor and displacement meter. The monitoring results show that HLS measurements are strongly affected by the environmental temperature. Therefore, to obtain the actual deformation of a monitoring target, the measurements should be further processed to reduce the effect of temperature on the result. To this end, four data processing schemes are proposed, which are based on the frequency of processing (i.e., day by day, monthly, quarterly, or annually). The results demonstrate that the quarterly processing scheme effectively reduces the impact of temperature on deformation measurements and therefore provides the most accurate results among the four schemes considered. Since after correction, the HLS measurements are consistent with the independent monitoring results obtained from the slope sensor and displacement meter, the proposed correction strategy is workable and might be considered for similar monitoring scenarios in future.
Highlights
Vertical displacement monitoring is important for evaluating the health status of infrastructures
In order to automatically monitor the stability of the foundation of 163# tower in near real time, we have installed multiple types of sensors (i.e., 7 m range hydrostatic leveling system (HLS), etc.) on the foundation of 163# tower and collect sensor data based on GPRS wireless network
This paper focused on methods for refining the measurements obtained from a vibrating-wire HLS by accurately accounting for the temperature effect using four different calculation schemes
Summary
Vertical displacement monitoring is important for evaluating the health status of infrastructures. Numerous methods of vertical displacement monitoring have been employed, such as precise leveling, trigonometric leveling, global navigation satellite system (GNSS) technology, and hydrostatic leveling systems (HLSs) Among these methods, HLS is a highly accurate, automated, and widely used measurement technology. Yin [7] applied the HLS to measure the vertical displacement responses of metropolitan train tunnels; the capacity for automation and continuity of the method provided a definite advantage over precise leveling which cannot be employed for monitoring during the train operation period. Martin [8] applied an HLS composed of more than 500 sensors to measure the vertical displacement responses of the European Synchrotron Radiation Facility (ESRF), and the system demonstrated a precision of about 1 to 3 μm over short periods, which has a satisfied agreement with level and tilt survey data. The results demonstrate that the quarterly processing scheme provides the most accurate results of the four schemes considered
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