Experimental and Numerical Investigation of Cryogenic Fracturing in Coal Rocks Using Compression and Dog-Bone Testing Methods
Longinos S.N. Begaliyev D. James M. Konysbekov A.
December 2025Springer
Rock Mechanics and Rock Engineering
2025#58Issue 1213071 - 13088 pp.
Using water-saturated specimens, the study assessed the effectiveness of liquid nitrogen (LN2) in two distinct coal fracturing techniques: freezing time (FT) and freezing–thawing cycle (FTC). Tensile (dog bone) and uniaxial compressive strength (UCS) tests were used to evaluate the efficacy of cryogenic treatment on coal rocks. The UCS and dog bone test results showed that FTC experiments performed better than FT experiments. This implies that more considerable permeability improvements could be obtained by multiple LN2 injections in real-world LN2 fracturing applications. Furthermore, von Mises stress analysis followed changes over time in numerical simulations to examine the stress distribution patterns in coal samples undergoing cryogenic treatment. The remarkable correlation between the simulation findings and experimental data confirmed the model’s accuracy, particularly during peak stress periods. The viability of using LN2-based treatments to increase coal bed permeability is strongly supported by these results, which have substantial ramifications for raising the effectiveness and security of coal extraction procedures.
Coal , Dog bone , Hydraulic fracturing , Liquid nitrogen , Modeling
Text of the article Перейти на текст статьи
School of Mining and Geosciences, Department of Petroleum Engineering, Nazarbayev University, Astana, Kazakhstan
Industrial and Technological Institute, Zhangir Khan University, Uralsk, Kazakhstan
School of Engineering and Digital Sciences, Department of Civil and Environmental Engineering, Nazarbayev University, Astana, Kazakhstan
School of Mining and Geosciences
Industrial and Technological Institute
School of Engineering and Digital Sciences
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026