Using acoustic emission and memory effect in evaluation of structural stability of frozen soil under cyclic heating and mechanical loading

A new method is substantiated for geocontrol and monitoring of soil stability at the bottom of foundations of buildings and structures in the zones of seasonal and permanently frozen ground. The aspects of geomechanics and geocryology are discussed as load-bearing capacity of soil is greatly affected by both the applied mechanical load and the ambient temperature fluctuation. The problem is formulated to check the presence of memory effects in acoustic emission (thermomechanical equivalents of the Kaiser and Felicity effects) in subsoil subject to alternating positive and negative temperatures and simultaneously experiencing different-stage states of strain. For solving the problem, a set of experiments was carried out to record parameters of acoustic emission in multi-cyclic thermomechanical loading of soil samples of various composition and degree of freezing. The loading consisted of fast heating of a pre-frozen sample subject simultaneously to external quasi-static mechanical loading and internal stresses due to frost heave. Using the experimentally determined relationships, the information capacity of the basic known approaches to revealing memory effects in acoustic emission in ice-and-rock matrix was analyzed. It is shown that these memory effects can be used for estimation of change in the load-bearing capacity and structural stability of soil as function of soil loading conditions. The new numerical criterion is proposed for assessing increment and relaxation of stresses in soil as functions of soil strain state. This criterion is also applicable to identification of signs of soil transition to shearing stage according to the classification of Professor N.M. Gersevanov.

Keywords: frozen and thawed soil, temperature conditions, load-bearing capacity, stress state, thermomechanical loading, acoustic emission, relationships, experiment, development of geocontrol methods.
For citation:

Novikov E. А., Zaytsev M. G. Using acoustic emission and memory effect in evaluation of structural stability of frozen soil under cyclic heating and mechanical loading. MIAB. Mining Inf. Anal. Bull. 2020;(3):30-44. [In Russ]. DOI: 10.25018/0236-1493-2020-3-0-30-44.

Acknowledgements:

The study was supported by the Russian Science Foundation, Project No. 18-77-00009.

Issue number: 3
Year: 2020
Page number: 30-44
ISBN: 0236-1493
UDK: (624.131.5+ 551.34):(534.2+534.6)
DOI: 10.25018/0236-1493-2020-3-0-30-44
Article receipt date: 02.12.2019
Date of review receipt: 24.01.2020
Date of the editorial board′s decision on the article′s publishing: 20.02.2020
About authors:

E.А. Novikov1, Assistant Professor, e-mail: e.novikov@misis.ru,
M.G. Zaytsev1, Student, e-mail: michailzaytsev1997@gmail.com,
1 National University of Science and Technology «MISiS», 119049, Moscow, Russia.

 

For contacts:

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

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