PSI - Issue 32

V. Epin et al. / Procedia Structural Integrity 32 (2021) 64–70 V.Epin/ Structural Integrity Procedia 00 (2021) 000–000

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Fig. 5. The surface of vertical displacements field in September 2020 (a) and March 2021 (b)

Fig. 6 below shows the correlation between the difference in the settlement readings of the two sensors and the difference in their temperature readings over the entire observation period (sensors 7 and 13 and sensors 10 and 15).

b

a

13-7 sensor: R ² = -0.0815

10-15 sensor: R ² = -0.0097

-3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0.0 0.5

-10 -8 -6 -4 -2 0

ΔU, mm

ΔU, mm

-10

-5

0

5

10

-4

-2

0

2

ΔT, ° C

ΔT, ° C

Fig. 6. Temperature correlation between pairs of sensors 10-15 (a) and 7-13 (b) from December 2019 to March 2021.

The temperature difference does not correlate with the difference in settlements of the sensors. Thus, there is no obvious influence of the temperature on the measuring system over the entire observation period. Observed settlements are not virtual displacement caused by the temperature error of hydrostatic level. 5. Conclusions An automated system for monitoring the uneven settlements of elements of the headframe of the mine shaft from the action of operational and natural loads has been developed and installed. The system is adapted to the conditions of different annual temperatures and aggressive external environment. The use of this system allows online monitoring of the deformation parameters of structural elements to detect signs of a critical stress-strain state of the structure. Analysis of the measurement results for the period from December 2019 to March 2021 made it possible to establish that the main factor determining the uneven settlement of the structure is the “lifting” and “settling” of