Damage Evolution Mechanisms of Rock Induced by Blasting with the Aid of Empty-Hole Effect

Meng, Ningkang; Bai, Jianbiao; Chen, Yong; Wang, Xiangyu; Wu, Weili; Wu, Bowen; Liu, Shuaigang

doi:10.3390/en13030756

Cited by 14 publications

(8 citation statements)

References 33 publications

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“…1). f 0 is the stress release rate of the rock mass surrounding the entry, which is 0.4 for elastic-plastic surrounding rock [43]; x is the distance between the EDWF and cross section A-A; and R A is the in uence radius of the EDWF, which is approximately equal to the excavation radius for this project (2.36 m). Fig.…”

Section: Stress Release Ratementioning

confidence: 99%

Analysis of aWater-Inrush Disaster Caused by Coal Seam Subsidence Karst Collapse Column under the Action of Multi-Field Coupling in Taoyuan Coal Mine

Lin¹,

Zhang²,

Guo³

2021

Computer Modeling in Engineering &Amp; Sciences

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Minin-induced water inrush from a con ned aquifer due to subsided oor karst collapse column (SKCC) is a type of serious disaster in the underground coal extraction. Karst collapse column (KCC) developed in a con ned aquifer occurs widely throughout northern China. A water inrush disaster from SKCC occurred in Taoyuan coal mine on February 3, 2013. In order to analyze the e ect of the KCC in uence zone's (KCCIZ) width and the entry driving distance of the water inrush through the fractured channels of the SKCC, the stress, seepage, and impact dynamics coupling equations were used to model the seepage rule, and a numerical FLAC3D model was created to determine the plastic zones, the vertical displacement development of the rock mass surrounding the entry driving working face (EDWF), and the seepage vector and water in ow development of the seepage eld. The hysteretic mechanism of water inrush due to SKCC in Taoyuan coal mine was investigated. The results indicate that a water inrush disaster will occur when the width of the KCCIZ exceeds 16 m under a driving, which leads to the aquifer connecting with the fractured zones of the entry oor. Hysteretic water inrush disasters are related to the stress release rate of the surrounding rocks under the entry driving. When the entry driving exceeds about 10 m from the water inrush point, the stress release rate reaches about 100%, and a water inrush disaster occurs.

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Section: Stress Release Ratementioning

confidence: 99%

Analysis of aWater-Inrush Disaster Caused by Coal Seam Subsidence Karst Collapse Column under the Action of Multi-Field Coupling in Taoyuan Coal Mine

Lin¹,

Zhang²,

Guo³

2021

Computer Modeling in Engineering &Amp; Sciences

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“…With the construction of large-scale intelligent mines, the double-roadway layout system will be chosen for more working faces. The research on controlling gob-side entry retaining roadways, gob-side entry driving roadways and rock surrounding the roadways has achieved many results, while there is less research on controlling of stability of the coal pillar and its supporting structures in the double-roadway layout system under the disturbance of roadway driving, working face mining, and repeated mining (Qi and Fourie, 2019;Zhang et al, 2020b;Meng et al, 2020;Chen et al, 2021a;Chen et al, 2021b). Wu et al (2019c) proposed the strengthening effect of high-intensity support and grouting on coal pillars in mining roadways.…”

Section: Introductionmentioning

confidence: 99%

Study on the Stability of Coal Pillars Under the Disturbance of Repeated Mining in a Double-Roadway Layout System

et al. 2021

Self Cite

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The double-roadway layout system, which is extensively applied in large mines, has the potential to significantly balance excavation-mining and improve mine ventilation and transportation capacity. However, the coal pillar in the double-roadway layout system is easily destabilized due to the disturbance of repeated mining, which has a significant impact on the safety and reliability of coal mines. This paper takes the coal pillar and its supporting structure of the double-roadway layout system as the research object, establishes a UDEC trigon numerical calculation model, and systematically corrects the input parameters, while explaining the excavation method of roadways and the simulation method of the supporting structure element. The numerical simulation results show that under the conventional support intensity conditions, the internal damage of the coal pillar during the excavation period is about 20%, while the internal damage to the coal pillar develops to 55% throughout the first-panel mining. During the disturbance of repeated mining, the damage in the coal pillar increased to 90%, and the coal pillar was already in a state of failure. Under the combined control of rock bolts and counter-pulled anchor cables, the coal pillar damage does not change significantly during the excavation and first-panel mining. During the disturbance of repeated mining, the damage of the coal pillar is reduced to 63%. There is a certain low damage area in the coal pillar, which can ensure the stability of the coal pillar and its supporting structure as a whole. Furthermore, the on-site monitoring results show that the maximum value of the floor-to-roof and rib-to-rib convergence of a W1310 tailgate during the repeated mining disturbance stage is 730 and 620 mm, respectively. The findings of this study give an approach to—as well as estimated values for the design of, including its “small structure” control technical parameters—the double-roadway layout system.

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“…In the process of rock fragmentation by parallel-hole cutting, existing empty holes provide new free faces, and the stress distribution around empty holes changes, leading to a stress concentration around empty holes that results in increased rock-breaking efficiency [21], which is known as an empty-hole effect during parallel-hole cutting [22]. Extensive research efforts have been performed in the empty-hole effect [23][24][25]. Li et al [26] identified the law of stress distribution during parallel-hole cutting using a numerical simulation method.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Empty‐Hole Effect during Parallel‐Hole Cutting under Different In Situ Stress Conditions

Luo

Chen

et al. 2021

Advances in Civil Engineering

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With the progress of deep mining in mine exploitation, the effect of the in situ stress field plays a more and more significant and crucial role in rock blasting. To uncover the impact of in situ stress field on empty-hole effect during parallel-hole cutting, the distribution and the trend of changes in dynamic stress around empty hole during blasting under different in situ stress conditions are simulated based on the basic model for parallel-hole cutting using 3D finite element analysis software ANSYS/LS-DYNA and implicit-explicit analysis method. Subsequently, the law of variation in the empty-hole effect under different in situ stress conditions is determined, and the effects of horizontal and vertical stress fields are analyzed in detail. The simulation results show that the overall increase in in situ stress can facilitate compressive failure and inhibit tensile failure in the rock mass around an empty hole during blasting. When empty holes are arranged horizontally, the effect of the vertical stress field is consistent with that of the in situ stress field, while the effect of the horizontal stress field is opposite to that of the in situ stress field. With the increased stress, the inhibitive effect of the vertical stress field on tensile stress around an empty hole is remarkably stronger than that of the horizontal stress field. Finally, the numerically simulated results are verified by the theoretical calculation. This study can provide new insight and a simple but accurate numerical simulation method to investigate how the in situ stress field affects the empty-hole effect, especially in deep mining.

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Damage Evolution Mechanisms of Rock Induced by Blasting with the Aid of Empty-Hole Effect

Cited by 14 publications

References 33 publications

Analysis of aWater-Inrush Disaster Caused by Coal Seam Subsidence Karst Collapse Column under the Action of Multi-Field Coupling in Taoyuan Coal Mine

Analysis of aWater-Inrush Disaster Caused by Coal Seam Subsidence Karst Collapse Column under the Action of Multi-Field Coupling in Taoyuan Coal Mine

Study on the Stability of Coal Pillars Under the Disturbance of Repeated Mining in a Double-Roadway Layout System

Numerical Simulation of Empty‐Hole Effect during Parallel‐Hole Cutting under Different In Situ Stress Conditions

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