Measurement of Additional Strains in Shaft Lining Using Differential Resistance Sensing Technology

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.

Crack monitoring using multiple smart materials; fiber-optic sensors & piezo sensors

“…The dimensions of the specimen are 800 × 50 × 2.67 mm 3 and three smart materials, FBG, FOPS, and lead zirconate titanate (PZT), are bonded on the specimen. The schematic of the cross-section of the specimen is shown in Figure 1.…”

“…Generally, the strain changes abruptly in these structures due to damages. Structures such as mechanical blades, shafts, aero-wings, and civil structures have to be monitored for strain variations due to cracks and damages [1][2][3][4]. Different smart materials are being used to monitor the health of structures.…”

Failure Mechanism of Rock Bridge Based on Acoustic Emission Technique

“…Many scholars have studied macrofailure and micropropagation of cracks evolution under shear loading, such as simulating microdevelopment of crack using cellular automata [24,25], time distribution features of rock crack [26], brittle failure mechanism of rock [27], the influence of size effect on rock failure [28], and differential resistance sensing technology [29]. But small scale direct shear tests of different rock bridge length using AE are few.…”

Analysis and application of two-current-source circuit as a signal conditioner for resistive sensors

“…As a result, measuring two increments at the same time, as well as the sum and difference of resistances is possible. This conditions and formulas can be useful in applications with strain gauges, especially when a resistance sensor is differential [14]. Differences between linearized equations (10), (11) and the real ones (8), (9) are described with the use of relative non-linearity coefficients of δ AB and δ DC .…”