A comprehensive geomechanical method for the assessment of rockburst hazards in underground mining

Małkowski, Piotr; Niedbalski, Zbigniew

doi:10.1016/j.ijmst.2020.04.009

Cited by 78 publications

(32 citation statements)

References 17 publications

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“…(5) It is assumed that groundwater seepage has a stable flow and follows Darcy's law of seepage and hydraulic movement principles [22,23]. (6) It is assumed that the calculation parameters do not change with the groundwater environment after rock burst, and the calculation parameters are invariants in the calculation process [24][25][26].…”

Section: Basic Assumptions For Mechanical Calculationmentioning

confidence: 99%

Numerical Simulation of Cracking Failure and Weakening Law of Roadway Surrounding Rock under High Stress

Cheng

Chen

et al. 2021

Shock and Vibration

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In deep roadway mining, high water pressure causes rock mass cracking and weakens the overall strength, affecting the stability of underground metal mine mining roadways. Therefore, using a numerical simulation method, we analyzed the strain softening characteristics of rocks after the inflexion point of elasticity and studied the strain distribution and the minimum support resistance under high-pressure groundwater conditions. Considering the groundwater pressure and effective porosity on the strain softening characteristics of the surrounding rocks, we investigated the critical groundwater pressure under which the surrounding rocks would remain stable. Actual engineering verification helps to obtain the supporting characteristic curves under different influencing factors. We found that water pressure and effective porosity are the significant factors that decide the development scope of the plastic zone. The more significant the increase of the plastic zone, the more notable the changes in the support curve. Moreover, the plastic zone is likely to occur when the hydraulic head is between 30 and 50 m; when the hydraulic head exceeds 50 m, it is likely to produce a relaxation zone.

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Section: Basic Assumptions For Mechanical Calculationmentioning

confidence: 99%

Numerical Simulation of Cracking Failure and Weakening Law of Roadway Surrounding Rock under High Stress

Cheng

Chen

et al. 2021

Shock and Vibration

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“…Coal and rock mass buried in deep is subjected to a complex geological environment with the depletion of shallow resources and the increase of coal mining depth [1,2]. Coal mass with great stored elastic energy may be subjected to strong impact loading when it is disturbed by mining operations, such as uncovering coal seam from rock mass, engineering blasting, roadway excavation, nearby coal seam mining, resulting in serious mine dynamic disasters such as rockburst, coal and gas outburst accompanyed with a large amount of released energy [3][4][5][6][7][8][9]. ese disasters may lead to great property losses and casualties.…”

Section: Introductionmentioning

confidence: 99%

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

Tang

Qin³

et al. 2021

Shock and Vibration

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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.

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“…In terms of control technology, the current methods are mainly to increase support resistance and artificially weakening hard thick roofs, including blasting and hydraulic fracturing technology [17][18][19]. However, once the support selection is determined, the range of passively increasing the working resistance is limited, which will increase the cost and reduce the production efficiency.…”

Section: Introductionmentioning

confidence: 99%

Mining-Induced Stress Control by Advanced Hydraulic Fracking under a Thick Hard Roof for Top Coal Caving Method: A Case Study in the Shendong Mining Area, China

2021

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Fully mechanized top-coal caving mining with high mining height, hard roofs and strong mining pressure are popular in the Shendong mining area, China. The occurrence of dynamic disasters, such as rock burst, coal and gas outburst, mine earthquakes and goaf hurricanes during the coal exploitation process under hard roof conditions, pose a threat to the safe production of mines. In this study, the characteristics of overburden fracture in fully mechanized top-coal caving with a hard roof and high mining height are studied, and the technology of advanced weakening by hard roof staged fracturing was proposed. The results show that the hard roof strata collapse in the form of large “cantilever beams”, and it is easy to release huge impact kinetic energy, forming impact disasters. After the implementation of advanced hydraulic fracturing, the periodic weighting length decreases by 32.16%, and the length of overhang is reasonably and effectively controlled. Ellipsoidal fracture networks in the mining direction of the vertical working face, horizontal fracture networks perpendicular to the direction of the working face, and near-linear fracture planes dominated by vertical fractures were observed, with the accumulated energy greatly reduced. The effectiveness of innovation technology is validated, and stress transfer, dissipation and dynamic roof disasters were effectively controlled.

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A comprehensive geomechanical method for the assessment of rockburst hazards in underground mining

Cited by 78 publications

References 17 publications

Numerical Simulation of Cracking Failure and Weakening Law of Roadway Surrounding Rock under High Stress

Numerical Simulation of Cracking Failure and Weakening Law of Roadway Surrounding Rock under High Stress

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

Mining-Induced Stress Control by Advanced Hydraulic Fracking under a Thick Hard Roof for Top Coal Caving Method: A Case Study in the Shendong Mining Area, China

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