Internal Mechanism of Reducing Rockburst Proneness of Rock Under High Stress by Real-Time Drilling Pressure Relief

Gong, Fengqiang; He, Zhichao; Jiang, Quan

doi:10.1007/s00603-022-02904-w

Cited by 29 publications

(2 citation statements)

References 40 publications

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“…Thus, it is necessary to take measures in advance from reducing static and dynamic loads of surrounding rocks and improving supporting performances [2]. (3) In order to reduce the strength and bursting liability of coal-rock masses and transfer high static stresses to deep surrounding rocks, the pressure-relief measures should be reasonably carried out outside the roadway support structure, such as pressure-relief blasting [39], large diameter pressure-relief drilling, water-infusion softening, etc. (4) Reducing the dynamic-loading energy is the main method for controlling dynamic disturbances.…”

Section: Application In Coal Burst Prevention and Controlmentioning

confidence: 99%

A Novel Coal Burst Criterion of Anchored Roadway Surrounding Rock under Dynamic Disturbance

Wang,

2023

Advances in Civil Engineering

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Mining roadway is the main occurrence area of coal bursts in underground coal mining. A good understanding of the failure process of elastic zone and energy evolution inducing instability of support structure can offer useful insight into the coal burst mechanism. This study proposes a novel coal burst criterion of anchored roadway surrounding rock under dynamic disturbance through mechanical modeling. The coal burst hazard and its main controlling factors were studied based on case analysis, and then the application of novel criterion in coal burst prevention and control was clarified. Results show that the existence of residual energy Ur of elastic zone is a prerequisite for coal burst of the roadway. The roadway support with ultimate value Us of absorbed energy needs to resist and absorb the kinetic energy Uk released from a dynamic failure of elastic zone and the energy Up imposed by impact-induced convergence of surrounding rocks on a support system, and the novel coal burst criterion is proposed as Uk + Up > Us. Under the same support conditions, the roadway roof is more prone to dynamic failure. According to the influences of main controlling factors on coal burst hazard, the corresponding prevention and control measures can be taken from improvement for the anti-impact capability of support, pressure relief in surrounding rocks, reduction of dynamic-loading energy, and roadway restoration after coal burst.

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Section: Application In Coal Burst Prevention and Controlmentioning

confidence: 99%

A Novel Coal Burst Criterion of Anchored Roadway Surrounding Rock under Dynamic Disturbance

Wang,

2023

Advances in Civil Engineering

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“…Hence, rockburst disasters in roadways have become one of the main challenges that hinder safe production of coal mines (Xu et al, 2021;Dai et al, 2022;He and Wang, 2023;Wang et al, 2023). Rockburst in roadways may cause not only serious economic loss and casualties but also extremely negative social impact (Gong et al, 2022;Wang et al, 2022;Liu et al, 2023). In addition, the frequent occurrence of rockburst disasters in roadways in the coal industry is incompatible with the theme for harmonious and stable development of the current society (Zou et al, 2022a;Huang et al, 2023b), which restricts the further development of the coal industry (Tan Y. L. et al, 2023;Zhao et al, 2023b;.…”

Section: Introductionmentioning

confidence: 99%

Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines

Xuan,

Cheng,

et al. 2023

Front. Energy Res.

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Influenced by the deep high-stress environment, geological structures, and mining disturbance in coal mines, the frequency of rockburst disasters in roadways is increasing. This research analyzed energy evolution characteristics during rockburst development in the elastic bearing zone and energy conversion in the plastic failure zone. The critical energy criteria for structural instability of roadway surrounding rocks were deduced. Numerical software was also applied to simulate the energy evolution during rockburst development in surrounding rocks of rockburst-prone roadways under conditions of different mining depths and coal pillar widths. The occurrence mechanism of rockburst deep in coal mines was analyzed from the perspective of energy in structures of deep roadway surrounding rock in coal mines. The research results show that the critical energy criteria are closely related to the elastic strain energy stored in deep roadway surrounding rocks and the energy absorbed by support systems. The impact energy in roadways is directly proportional to the square of the stress concentration factor k. Moreover, as the mining depth increases, the location of the peak point of maximum energy density gradually shifts to coal ahead of the working face. The larger the mining depth is, the more significantly the energy density is influenced by advanced abutment pressure of the working face and the wider the affected area is. With the increment of the coal pillar width, the distance from the peak point of energy density to the roadway boundary enlarges abruptly at first and then slowly, and the critical coal pillar width for gentle change in the distance is 30 m. Changes in the peak elastic energy density in coal pillars with the coal pillar width can be divided into four stages: the slow increase stage, abrupt increase stage, abrupt decrease stage, and slow decrease stage. The elastic energy density is distributed asymmetrically in deep roadway surrounding rocks in coal mines. Under the action of structures of roadway surrounding rocks, energy evolution in these structures differs greatly during rockburst development under conditions of different coal pillar widths. This research provides an important theoretical basis for the support of rockburst-prone roadways during deep coal mining.

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Research on mechanism and practice of expansion‐induced fracturing and pressure relief in deep coal mines

Gu,

Liu,

et al. 2024

Energy Science & Engineering

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A nonexplosive expansion method is proposed to apply in the field of rock burst prevention and control in coal mine. The principle of the expansive agent reaction was analysed and specimens with one hole and two holes were tested with and without axial stress or an expansive agent. The results showed that the reaction products of the expansive agent exhibited excellent fluidity and did not induce secondary stress concentration within the specimens. The specimens with two holes exhibited more severe and intricate fractures upon introduction of the expansive agent, and the formation of crisscross networks of cracks occurred in both the horizontal and vertical directions. Stress concentration became more pronounced as the distance between the two holes decreased, making the specimen more vulnerable to cracking. A field test was conducted to evaluate the effectiveness of pressure relief through expansion‐induced fracturing in the roadway of 1318 working face. The results from the field test demonstrated that the quantity of coal powder in the deep area significantly decreased after expansion‐induced fracturing and fell well below the early warning index of the drilling cutting method.

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Internal Mechanism of Reducing Rockburst Proneness of Rock Under High Stress by Real-Time Drilling Pressure Relief

Cited by 29 publications

References 40 publications

A Novel Coal Burst Criterion of Anchored Roadway Surrounding Rock under Dynamic Disturbance

A Novel Coal Burst Criterion of Anchored Roadway Surrounding Rock under Dynamic Disturbance

Energy evolution mechanism during rockburst development in structures of surrounding rocks of deep rockburst-prone roadways in coal mines

Research on mechanism and practice of expansion‐induced fracturing and pressure relief in deep coal mines

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