応用科学研究の進歩 オープンアクセス

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Using Micro Seismic Waves to Investigate the Influence of Thermal Conditions on Stability of Piles

Ngwu Tochukwu Ambrose1*, Konstantin V Fedin2, Lucky more Ngomayezwe2, Ekolle Ndinde Eya2

Studies show that in the Norilsk region, about 250 buildings were damaged due to the deterioration of permafrost conditions over the last decade due to warming temperature regimes, which significantly effects the natural vibration characteristics of structures found in this area. The investigation of the influence of thermal conditions on pile stability was carried out between 21^st August to 25^th October 2021, using peak frequencies of seismo-acoustic noises to evaluate proper oscillations of building piles and comparing the compiled peak frequencies with average temperature of the corresponding time windows. The results from graphical illustration shows that temperature fluctuations result in little to significant adjustments in peak frequency values. The period between 11^th to 14^th October illustrated the most intriguing outcomes as the highest peak frequencies of 9.4 Hz, 8.3 Hz (first floor) and 3.55 Hz, 3.53 Hz (roof) during a negative temperature regime of -6.5°C, which indicates drastic decrease in temperature as winter period approaches. This finding proposes that temperature changes have an influence on the stability piles of the building and this method is able to detect slight changes and fluctuations in temperature, by recording micro seismic waves on piles of the building and indicating varying peak frequency responses (viewed using SPECTRUM), against temperature changes throughout the period of monitoring and this illustrates that temperature fluctuations has an influence on stability of piles. Hence, there is high possibility that the relationship between these two parameters will be more significant over extensive course of monitoring (through summer and winter) as it can provide broader information about the behavior of the piles as temperature changes occur.