College of Mining, NUST MISIS, Moscow, Russia:

E. A. Novikov, Associate Professor, Candidate of Engineering Sciences, e.novikov@misis.ru
E. A. Klementiev, Student

The article describes testing results on efficiency of thermal activation of manmade-reinforced soil to increase percentage of friendly signals, characteristic of the soil structure and strength evolution, in the flow of the acoustic emission events generated in soil. The proposed approaches to the multiparametric processing of data measured using the suggested method of thermally stimulated acoustic emission (TAE) produce the structure-sensitive numerical rating Rtngeru. The signature of these approaches and Rtngeru as compared with the earlier guides on the same subject is the absent restriction of the application domain of the studies into soil structure, properties and behavior exclusively to frozen soil. The correlation between the values of Rtngeru and evolution of strength properties is proved for the same-type and cryothermally consolidated and chemically reinforced (treated with a cement-based solution) soils. The TAE method has for the first time produced the results which enable following the deformation development in geomaterials and allow numerical expression of new structural bonds as the grouting spreads and hardens. It is shown that different graininess of soil has no interfering influence on Rtngeru. The article justifies applicability of the approaches to monitoring dynamics of structural stability of complex-stress foundation soil to obtain hard information on the efficiency and sufficiency of efforts undertaken to prevent extensive subsidence, displacement, landslides and other hazardous events connected with loss of load-bearing capacity in soil.
The study was supported by the Russian Science Foundation, Project No. 21-77-00010.

1. Khafizov R. M. Analysis of methods for determining the deformation characteristics of cohesive soil. Soil Mechanics and Foundation Engineering. 2015. Vol. 52, No. 6. pp. 361–365.
2. Boldyrev G. G. Methods to determine mechanical properties of soils with notes to GOST 12248–2010. 2nd enlarged and revised edition. Moscow : OOO Prondo, 2014. 812 p.
3. Carey A. S., Howard I. L. Backcasting and forecasting stabilized soil mechanical properties for mech anistic-empirical pavement design. Construction and Building Materials. 2022. Vol. 324. 126645. DOI: 10.1016/j.conbuildmat.2022.126645
4. Yanru Zhao, Xiangsheng Chen, Tiande Wen, Pinghao Wang, Wanshuang Li. Experimental investigations of hydraulic and mechanical properties of gran ite residual soil improved with cement addition. Construction and Building Materials. 2022. Vol. 318. 126016. DOI: 10.1016/j.conbuildmat.2021.126016
5. Pongsivasathit S., Horpibulsuk S., Piyaphipat S. Assessment of mechanical properties of cement stabilized soils. Case Studies in Construction Materials. 2019. Vol. 11. 00301. DOI: 10.1016/j.cscm.2019.e00301
6. Di Maio R., De Paola C., Forte G., Piegari E., Pirone M. et al. An integrated geological, geotechnical and geophysical approach to identif y predisposing factors for flowslide occurrence. Engineering Geology. 2020. Vol. 267. 105473. DOI: 10.1016/j.enggeo.2019.105473
7. Lizheng Deng, Hongyong Yuan, Jianguo Chen, Zhanhui Sun, Ming Fu et al. Experimental investigation on progressive deformation of soil slope using acoustic emission monitoring. Engineering Geology. 2019. Vol. 261. 105295. DOI: 10.1016/j.enggeo.2019.105295
8. Voznesenskiy A. S., Kutkin Ya. O., Krasilov M. N. Interrelation of the Acoustic Q-Factor and Strength in Limestone. Journal of Mining Science. 2015. Vol. 51, Iss. 1. pp. 23–30.
9. Li-jun Su, Xing-qian Xu, Xue-yu Geng, Shuang-qing Liang. An integrated geophysical approach for investigating hydro-geological chara cteristics of a debris landslide in the Wenchuan earthquake area. Engineering Geology. 2017. Vol. 219. pp. 52–63.
10. Kutkin Ya. O., Krasilov M. N., Nasibullin R. R., Tyutcheva A. O. Effect of static and dynamic loading on strength and q-factor relationship. GIAB. 2018. No. 12. pp. 127–133.
11. Kapustin V. V., Churkin A. A., Vladov M. L., Zasorin M. S., Shmurak D. V. Instrumental quality control of soil-cement columns and solids by seismoacoustic methods. Soil Mechanics and Foundation Engineering. 2022. Vol. 58, No. 6. pp. 518–526.
12. Wuwei Mao, Lisha Hei, Yang Yang. Advances on the acoustic emission testing for monitoring of granular soils. Measurement. 2021. Vol. 185. 110110. DOI: 10.1016/j.measurement.2021.110110
13. Wenli Lin, Liu Ang, Mao Wuwei, Koseki Junichi. Acoustic emission behavior of granular soils with various ground conditions in drained triaxial compression tests. Soils and Foundations. 2020. Vol. 60, Iss. 4. pp. 929–943.
14. Mojtaba Naderi-Boldaji, Mostafa Bahrami, Keller T., Dani Or. Characteristics of Acoustic Emissions from Soil Subjected to Confined Uniaxial Compression. Vadose Zone Journal. 2017. Vol. 16, Iss. 7. DOI: 10.2136/vzj2017.02.0049
15. Shkuratnik L. V., Novikov E. A. Thermally stimulated acoustic emission of rocks as a promising tool of geocontrol. Gornyi Zhurnal. 2017. No. 6. pp. 21–27. DOI: 10.17580/gzh.2017.06.04
16. Rivera-Gómez C., Galán-Marín C., López-Cabeza V. P., Diz-Mellado E. Sample key features affecting mechanical, acoustic and thermal properties of a natural-stabilised earthen material. Construction and Building Materials. 2021. Vol. 271. 121569. DOI: 10.1016/j.conbuildmat.2020.121569
17. Zhao Xia, Ren-peng Chen, Xin Kang. Laboratory characterization and modelling of the thermalmechanical properties of binary soil mixtures. Soils and Foundations. 2019. Vol. 59, Iss. 6. pp. 2167–2179.
18. Novikov E. A., Klementev E. A. Strength properties analysis of soil after hardening and/or cryogenic thermal reinforcement using the method of thermally stimulated acoustic emission. GIAB. 2022. No. 4. pp. 134–155.
19. Novikov E. A., Shkuratnik V. L., Zaytsev M. G., Klementev E. A., Blokhin D. I. Acoustic emission of frozen soils under quasi-static mechanical and cyclic thermal loading. Soil Mechanics and Foundation Engineering. 2020. Vol. 57, No. 2. pp. 97–104.