Strength properties analysis of soil after hardening and/or cryogenic thermal reinforcement using the method of thermally stimulated acoustic emission

This study aims to develop and verify methodical approaches which enable using thermally stimulated acoustic emission in soil subjected to chemical or physical reinforcement for the soil stability control in case of climatic impact or load exerted by surface engineering facilities. To this effect, a series of experiments was carried out to find acoustic emission parameters in passive and active measurements performed in initially loose and differently reinforced soil in von Karman compression at step-by-step increment in quasi-static load. The passive acoustic measurements assumed recording acoustic emission of structural bonds in the test samples under the influence of the internal stresses which appear in overlapping of fields generated by the mechanical loading and warm-up of a geomaterial. In turn, the active acoustic measurements combined thermal activation of structural bonds in soil and its sounding using an artificial external source of a rated signal; the change in the signal parameters after passing a test sample allows judging on development of deformation in this sample. Considering the experimental patterns, the measurement interpretation approaches are substantiated. These approaches provide the noise-free numerical acoustic emission criterion of change in deformation condition of soil preliminary hardened or reinforced under the external effects and impacts. The reliability of data obtained using the proposed method is proved by comparative tests of similar samples with deformation and ultrasound measurements according to the State Standard GOST 21153.2.

Novikov E. A., Klementyev E. A. Strength properties analysis of soil after hardening and/or cryogenic thermal reinforcement using the method of thermally stimulated acoustic emission. MIAB. Mining Inf. Anal. Bull. 2022;(4):134-155. [In Russ]. DOI: 10.25018/0236_ 1493_2022_4_0_134.

The study was supported by the Russian Science Foundation, Project No. 21-77-00010.

E.A. Novikov¹, Cand. Sci. (Eng.), Assistant Professor, e-mail: e.novikov@misis.ru, Scopus ID: 55235147200, ORCID ID: 0000-0002-6997-1097,
E.A. Klementyev¹, Student, e-mail: evgeniy-klementevof@mail.ru, Scopus ID: 57217249165, ORCID ID: 0000-0001-7242-0440,
¹ National University of Science and Technology «MISiS», 119049, Moscow, Russia.

E.A. Novikov, e-mail: e.novikov@misis.ru.

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