Abstract
As is well known, shaft lining fracture is the main disaster resulting in a large amount of fatalities and property loss. Thus, the additional strain is a key parameter to evaluate the safety condition of existing shaft linings. In this study, a new type of safety monitoring system based on differential resistance sensing technology is developed to measure the additional strain in shaft linings. In this paper, the theatrical study, the working principle, and the function of the newly developed monitoring system are fully presented. To investigate the reliability and effectiveness of the monitoring system, the differential resistance sensors are used to measure the horizontal and vertical strains at different elevations in a shaft lining during reinforcing the fracture inside the shaft lining. It can be found that from the test results the monitoring system based on differential resistance sensing technology can measure the deformation of the existing wall lining during stratum grouting. Therefore, it can be concluded that the newly developed monitoring system is significant for fracture warning and reinforcement engineering.
Highlights
Nowadays, more and more large-scale civil infrastructures are being constructed in prosperous cities [1]
It is imperative that a continuous structural health monitoring (SHM) system be developed [1, 2]
There are more than 100 shaft linings with similar fracture, which has caused a large amount of property loss and remains a great deal of potential troubles
Summary
More and more large-scale civil infrastructures are being constructed in prosperous cities [1]. There are more than 100 shaft linings with similar fracture, which has caused a large amount of property loss and remains a great deal of potential troubles. The depth of these vertical shaft linings is commonly ranging from 400 to 1000 meters. The differential resistance sensor with small size (φ30 × 100 mm) is suitable for lining monitoring without damage to the structure. All the sensors were connected to the junction box and computer through the armored cables In this case, the strain values of shaft lining can be collected automatically. SLHMS consists of sensor, electric cables, junction box, measurement unit, and computer
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