Dynamic Mechanical Properties of Deep Coal Rocks Under Three-Dimensional Dynamic and Static Loading

IF 1.9 4区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-12-23 DOI:10.1007/s00024-024-03641-7

Feng Ren, Chunlei Yao, Shuqi Xu, Jie Wang, Jiming Bao, Hua Chen, Guangchao Wei

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引用次数: 0

Abstract

Understanding deep coal rock’s dynamic mechanical characteristics is crucial for safe design and assessment of coal rock engineering. This article tested triaxial coal samples with SHPB on deep Test coal samples and equipment using the split Hopkinson pressure bar in different conditions. Coal stress–strain curves under combined triaxial dynamic-static loading show a consistent pattern. The first axial prestress prevented compaction in the stress–strain curves. The dynamic peak stress and secant modulus of deep coal samples rose linearly with constraint pressure and strain and decreased with axial prestress. Axial prestress changes occur at 8 MPa (44% of compressive strength). The amount of energy deep coal samples absorb during impact loading varies with axial static prestress at the same strain rate and confining pressure. It rises then falls. Coal samples went from shear damage to shear and tension damage as axial static tension rose. This research helps avoid coal rock dynamic catastrophes and evaluate mining engineering stability.

Graphical Abstract

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来源期刊

pure and applied geophysics 地学-地球化学与地球物理

CiteScore

4.20

自引率

5.00%

发文量

240

审稿时长

9.8 months

期刊介绍： pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.