Pressure-Relief Mechanism and Application of Large-Diameter Boreholes in Coal Seams with Rockburst Hazard

Hao, Zhen; Sun, Gongquan; Wei, Haihang; Liu, Jiayu; Tian, Maolin; Liu, Shuaiyi; Xu, Yikun

doi:10.1155/2021/5469999

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Large-diameter drilling stress relief technology is one of the commonly used control methods in deep underground engineering. Drilling holes into the rock mass in the high-stress area provides a release space for the high stress, to achieve the purpose of stress relief (Hao et al 2021). When the surrounding rock is disturbed by stress, the deformation of the surrounding rock mass is mainly realized by compressing the large-diameter drilling hole space.…”

Section: Large-diameter Drilling Holementioning

confidence: 99%

Occurrence mechanism and prevention technology of rockburst, coal bump and mine earthquake in deep mining

Du,

Bi,

Khandelwal

et al. 2024

Geomech. Geophys. Geo-energ. Geo-resour.

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Rockburst, coal bump, and mine earthquake are the most important dynamic disaster phenomena in deep mining. This paper summarizes the differences and connections between rockburst, coal bumps and mine earthquakes in terms of definition, mechanism, phenomenon, evaluation index, etc. The definition and evolution progress of the three disaster categories are summarized, as well as the monitoring, early warning, and prevention measures are also presented. Firstly, by combining theoretical research with specific technologies and engineering field cases, the main categories and failure mechanisms of rockburst, coal bumps and mine earthquakes are introduced. Then, the evaluation indexes of coal bump and mine earthquake are summarized, and a new evaluation index of rockburst is given. Finally, the characteristics of monitoring, early warning technologies and prevention methods of rockburst, coal bumps, and mine earthquakes are discussed in technology and application. At last, the future directions of rockburst, coal bump and mine earthquake are put forward.

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Section: Large-diameter Drilling Holementioning

confidence: 99%

Occurrence mechanism and prevention technology of rockburst, coal bump and mine earthquake in deep mining

Du,

Bi,

Khandelwal

et al. 2024

Geomech. Geophys. Geo-energ. Geo-resour.

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“…The effect of borehole destressing is greatly affected by borehole parameters, including drilling diameter, spacing, row spacing, depth, and so forth 14–17 . Usually, the greater the density of the borehole, the greater the energy release of the coal roadway, and the better the effect of pressure relief 18 . However, the unreasonable drilling borehole parameters may cause an excessive pressure relief effect.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17] Usually, the greater the density of the borehole, the greater the energy release of the coal roadway, and the better the effect of pressure relief. 18 However, the unreasonable drilling borehole parameters may cause an excessive pressure relief effect. It can reduce the bearing capacity of surrounding rock, even leading to the failure of the roadway support system.…”

Section: Introductionmentioning

confidence: 99%

Anchorage weakening effect of coal roadway sidewall with different destressing borehole diameters

Yin

Zhang

et al. 2023

Energy Science & Engineering

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The pressure relief with large-diameter boreholes is one of the effective methods to prevent coal bumps in deep coal roadway. An unreasonable pressure relief design can cause the rockbolt support failure and aggravate the deformation of the surrounding rocks. In this paper, a coupling model of roadway sidewall considering borehole pressure relief and rockbolt support was established. The influence of the destressing borehole diameter on the rockbolt located in the plastic zone and the roadway deformation was studied by theoretical calculation and numerical simulation. The results show that there is a critical zone of the borehole diameter for the influence on the rockbolt normal stress and roadway convergence. When the destressing borehole diameter exceeds the critical zone, the rockbolt normal stress decreases sharply. Considering the existence of the broken zone in the surrounding rock, the bolehole diameters in the critical zone increase with the increase of the distance between the borehole and the rockbolt, the residual strength, and decrease with the increase of initial stress. In the engineering analysis, with the increase of the destressing borehole diameter, the ultimate pullout force of rockbolt decrease, and the plastic zone of surrounding rock, the roadway deformation, the maximum axial force, and slippage of the rockbolt all increase. Therefore, to better keep the stability of the surrounding rock in coal roadway, the borehole pressure relief needs to be coordinated with the rockbolt support. The destressing borehole diameter in the pressure relief design should not be greater than the critical zone.

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Failure characteristics and mechanism of coal under the coupling between different confining pressures and disturbance loading

Zhou,

Liu,

Wang

et al. 2023

Bull Eng Geol Environ

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Pressure-Relief Mechanism and Application of Large-Diameter Boreholes in Coal Seams with Rockburst Hazard

Cited by 5 publications

References 13 publications

Occurrence mechanism and prevention technology of rockburst, coal bump and mine earthquake in deep mining

Occurrence mechanism and prevention technology of rockburst, coal bump and mine earthquake in deep mining

Anchorage weakening effect of coal roadway sidewall with different destressing borehole diameters

Failure characteristics and mechanism of coal under the coupling between different confining pressures and disturbance loading

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