Rock burst criteria and control based on an abutment‐stress‐transfer model in deep coal roadways

Zhang, Ming; Jiang, Fuxing

doi:10.1002/ese3.715

Cited by 36 publications

(31 citation statements)

References 22 publications

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“…In addition, the rockburst risk was determined by examining borehole drill cuttings according to the following equations 44

G = π r^{2} ω ρ

where G is the critical amount of the borehole drill cuttings; r is the radius of the borehole (0.021 m in this study); ρ is the average bulk density of the coal seam (1.37 × 10 3 kg/m); and ω is the borehole drill cuttings ratio which is the ratio of the borehole depth to coal seam thickness. Figure 11 shows the amount of borehole drill cuttings vs borehole depth.…”

Section: Case Studymentioning

confidence: 99%

Design of rib pillars in deep longwall mines based on rockburst and water‐seepage prevention

Zhang

Jiang

et al. 2020

Energy Science & Engineering

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Superhigh‐water backfill mining can mitigate rockburst risks in rockburst‐prone deep coal mines and reduce pollution caused by traditional cemented paste backfill. In this mining method, the width of the rib pillar between two longwall panels is important to maintain roadway stability, prevent rockbursts and water seepage. To design the width of rib pillars, this study firstly established a T‐shaped overlying strata structure model and analyzed source of stress that caused deformation of the T‐shaped model. Based on this model, the abutment stress in the rib pillar was determined. Then, the criterion for overall burst instability of the rib pillar was proposed according to the derived abutment stress. The limit equilibrium theory was applied to obtain the pillar plasticity which can be used as the criterion for water‐seepage prevention. The proposed approach was used to design the width of a rib pillar in Yineng Coalmine located in Shandong Province, China. The analysis of the microseismic monitoring results and borehole drill cuttings show that the designed rib pillar with a width of 10 m was stable without water seepage during mining, indicating the width design method proposed in this study is effective.

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“…In addition, the rockburst risk was determined by examining borehole drill cuttings according to the following equations 44

G = π r^{2} ω ρ

Section: Case Studymentioning

confidence: 99%

Design of rib pillars in deep longwall mines based on rockburst and water‐seepage prevention

Zhang

Jiang

et al. 2020

Energy Science & Engineering

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“…In many mining areas of Shandong, Henan, Anhui, Hebei, and other provinces, thick and hard rock strata exist which are characterized by great thicknesses, high strength levels, and good integrity [1][2][3]. e fracture movements of thick and hard rock strata overlying mining stopes can potentially cause different degrees of mining earthquakes and induce dynamic behaviors, such as rock bursts.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and Prevention and Control of Mine Earthquake in Thick and Hard Rock Strata considering the Horizontal Stress Evolution of Stope

Zhang

Huang

et al. 2021

Shock and Vibration

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This study investigated the mechanism, prevention measures, and control methods for earthquake disasters typically occurring in mines with thick and hard rock strata. A mine stope with large faults and thick hard rock strata in Hebei Province was taken as the background study object. Then, theoretical analysis and numerical simulation methods were adopted in conjunction with field monitoring to explore how horizontal stress evolves in the thick and hard hanging roofs of such mines, potentially leading to mining earthquakes. Then, based on the obtained results, a mining design method was proposed to reduce the horizontal stress levels of earthquake mitigation. The results showed that, under the control of large faults, semiopen and semiclosed stopes with thick hard rock strata are formed, which cause influentially pressurized and depressurized zones during the evolution of the overburden movements and horizontal stress. It was determined that the stress concentrations mainly originated from the release and transfer of horizontal stress during the rock fractures and movements in the roof areas, which were calculated using a theoretical estimation model. The horizontal stress concentrations formed “counter torques” at both ends of the thick and hard strata, which prevented the support ending due to tensile failures. As a result, the limit spans were increased. This study proposed a mining strategy of using narrow working faces, strip mining processes, and reasonable mining speeds, which could effectively reduce horizontal stress concentrations and consequently prevent and control mining earthquakes. This study’s research results were successfully applied to the mining practices in working face 16103.

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“…ey believed that roof migration can activate faults and trigger rock bursts. Jiang [19,20] studied the creep characteristics of deep coal masses under high stresses. Xu et al [21] discussed the formation mechanism of rock bursts on the coalface based on microseismic monitoring results and obtained precursory information.…”

Section: Introductionmentioning

confidence: 99%

Study on the Formation Mechanism of Rock Burst Caused by Seam Floor Slip under an Ultrathick Conglomerate

Feng

Wang

et al. 2021

Mathematical Problems in Engineering

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A rock burst accident occurred on coalface 13230 of the Gengcun Coal Mine in Henan Province. Through a field investigation, theoretical analysis, and microseismic monitoring, we studied how the rock burst, which was caused by overall seam floor slip and instability, occurring under an ultrathick conglomerate. Because the overlying ultrathick conglomerate in the mined-out zone close to coalface 13230 had been inadequately mined, the leading section of the coalface was under a high level of stress. Combined with the tectonic stresses from the F16 faultage and the soft floor structure, these factors caused the floor of this coalface to trigger the overall slip-type rock burst. In this paper, an estimation model of the ultimate bearing capacity of a seam floor under an ultrathick conglomerate and the advancing abutment pressure on the coalface is presented. This model is used to show that the ultimate bearing capacity of the seam floor on coalface 13230 is 26.3 MPa, and the abutment pressure is far more than the floor bearing capacity. We also present pressure relief and reinforced supporting measures, which can effectively prevent floor slip-type rock bursts from occurring. The results of this study provide a reference for the prevention and control of floor slip-type rock bursts in coal mining under an ultrathick conglomerate.

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Rock burst criteria and control based on an abutment‐stress‐transfer model in deep coal roadways

Cited by 36 publications

References 22 publications

Design of rib pillars in deep longwall mines based on rockburst and water‐seepage prevention

Design of rib pillars in deep longwall mines based on rockburst and water‐seepage prevention

Mechanism and Prevention and Control of Mine Earthquake in Thick and Hard Rock Strata considering the Horizontal Stress Evolution of Stope

Study on the Formation Mechanism of Rock Burst Caused by Seam Floor Slip under an Ultrathick Conglomerate

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