Experiments on Mechanical Response and Energy Dissipation Behavior of Rockburst‐Prone Coal Samples Under Impact Loading

Abstract

To reveal the dynamic mechanical response and energy dissipation behavior of rockburst-prone coal samples under impact loading, the compressive experiments on Xinzhouyao coals (prone) and Machang coals (nonprone) under different impact loadings were carried out using the Split Hopkinson Pressure Bar (SHPB). The dynamic mechanical properties were studied, including dynamic elastic modulus, strain rate, peak stress, peak strain, dynamic increment factor, and energy dissipation. The results show that the dynamic elastic modulus, peak stress, and peak strain of both prone and nonprone coals perform an obvious correlation with the increase of strain rate. The strain rate strengthening effect on the dynamic elastic modulus and compressive strength of rockburst-prone coal samples are more significant, reflected by the greater increment with the increase of strain rate, while the dynamic increment factors of both prone and nonprone coals show apparent strain rate strengthening. The incident, reflected, and transmitted energy of both two coals linearly increases with the impact velocity, although the increased rate may be different. The dissipated energy of rockburst-prone coal samples increases faster, while the rate of the increase of the dissipated energy is more stable with strain rate. The results may provide an important reference for revealing the failure law of engineering-scaled coal mass suffered by rockburst.

Numerical Simulation of Mechanical Characteristics of Roadway Surrounding Rock under Dynamic and Static Loading

“…According to (8) and (9), and (10), the conditions of the shock manifestation stress can be obtained, namely,…”

“…Guo et al [7] used the digital laser dynamic caustics system to study the influence of the blasting load on the adjacent roadway. Tang et al [8] used the SHBP experimental device to simulate the dynamic mechanical response and energy dissipation behavior of coal samples under impact loads. e main methods of numerical simulation include discrete element method, analytical method, and finite element method [9][10][11][12][13][14][15][16][17].…”

Dynamic Evolution and Quantitative Characterization of Fractures in Coal at the Eastern Edge of Ordos Basin under Axial Loading

“…In particular, tectonic stress is an essential factor in the distribution and expansion of microfractures in coal seams [4]. With the increase in burial depth, the stress conditions of coal rocks become more complex, resulting in the decline of CBM permeability [5], gas protrusion [6,7], and rock explosion [8,9], which probably enhances the difficulty of CBM exploration. Therefore, it is important to understand the initiation and evolution of the fracture network of coal rocks under different stress conditions, which is vital for exploiting CBM [10] and engineering safety [11,12].…”

Numerical simulation of roadway deformation and failure under different degrees of dynamic disturbance

“…For example, Baranowski 19 and Michał Kucewicz 20 respectively tested the mechanical properties of dolomite by using a drop hammer impact test device and SHBP device and verified by LS-DYNA numerical simulation software 21 . Tang 22 used a split Hopkinson Pressure Bar (SHPB) experimental device to study coal's dynamic mechanical response and energy dissipation behavior under impact load. Zhao 23 used a self-made drop-hammer coalrock impact loading test device to analyze the mechanism of the impact load on the evolution of the internal microstructure of the briquette.…”