Investigation of impact rock burst induced by energy released from hard rock fractures

Liu, Hao; Yu, Bin; Liu, Jinrong; Wang, Tongxu

doi:10.1007/s12517-019-4536-4

Cited by 19 publications

(9 citation statements)

References 11 publications

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“…Even though the maximum pull-out load of grouted rock bolts decreases as parallel to the decrease in self strength values of the grout material, significant amounts of increase in the energy absorption capacity make the use of MS Polymer additive advantageous for various aims such as combatting the rock burst [37][38][39][40].…”

Section: Resultsmentioning

confidence: 99%

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

Komurlu

2020

Int. J. of Geosynth. and Ground Eng.

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Effect of thermoset type polymeric additives on load-bearing capacities of grouted rock bolts was investigated with both laboratory and site studies. For the specimen preparation, two different silicone-based polymeric materials were added with different amounts in the cement and water mixes. Additionally, cement grouts without the polymeric additive were also used to compare results obtained from different grout usage cases. The additives are in the liquid phase while adding into the fresh cement mix and start to solidify due to the polymerization after being mixed in the grout material. Support performances of various grouted rock bolt specimens were tested under axial and shear loading conditions. According to the results of this study, use of the polymeric additives with an amount of 3.5% by weight in total mix significantly improves the ductility in support reactions of grouted bolts and increases the energy absorption capacity by high rates over 50%.

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Section: Resultsmentioning

confidence: 99%

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

Komurlu

2020

Int. J. of Geosynth. and Ground Eng.

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“…When the earthquake or earthquake induces vibration, it is easy for rock to burst, causing serious casualties and economic losses, which poses a great safety hazard to the safe and efficient mining of the working face. Therefore, in order to maintain the stability of the surrounding rock of the roadway and ensure the safe and efficient recovery of the working face, it is necessary to avoid the stress concentration of the surrounding rock caused by the hard roof [26][27][28][29][30][31][32]. The drilling pressure relief technology can reduce the internal stress concentration of the coal seam in the roadway, reduce the range of the high stress area, increase the caving property of the roof, and transfer the stress peak inside the coal body to the deep part to reduce the deformation of the surrounding rock of the roadway.…”

Section: Kuangou Coal Mine Engineering Backgroundmentioning

confidence: 99%

Study on the Evolution Law of Overburden Breaking Angle under Repeated Mining and the Application of Roof Pressure Relief

et al. 2019

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Aiming at the serious problems caused by coal mine mining activities causing the rock burst accidents, this paper is based on rock mechanics and material mechanics to establish the key layer breaking by the double-key layer beam breaking structural mechanics model of a single working face and double working face under repeated mining. The theoretical calculation formula of the angle was used as the theoretical basis for the elevation angle of the pre-reloading hole of the hard roof. The rationality and reliability of the formula were verified by the physical similarity simulation experiment and the 3 Dimension Distinct Element Code numerical simulation experiment, revealing the rock formation under the influence of repeated mining. The results show that the derived key layer breaking angle formula is suitable for the theoretical calculation of the breaking angle of the key layer of a single coal seam when the repeated disturbance coefficient is λ = 1; when it is λ = 2, it is suitable for the repeated mining of the short-distance double-coal mining. The rationality and reliability of the theoretical formula of the breaking angle of the double key layer of single coal seam and double coal seam were verified by the physical similarity simulation experiment. Through the 3DEC numerical simulation results and theoretical calculation results, the W1123 working face hard top pre-cracking pressure relief drilling elevation angle was 78°. The drilling peeping method was used to verify the results. The results show that the theoretical formula of the critical layer breaking angle is well applied in engineering practice.

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“…The mining disturbance of the working face causes abutment stress in the surrounding rocks of the stope and roadway and induces deformation and destruction of the surrounding rocks, even inducing dynamic disasters such as coal burst and rock burst . This has an impact on underground equipment and production systems and poses a threat to the safety of underground personnel .…”

Section: Introductionmentioning

confidence: 99%

“…The mining disturbance of the working face causes abutment stress in the surrounding rocks of the stope and roadway [1][2][3][4][5][6][7] and induces deformation and destruction of the surrounding rocks, even inducing dynamic disasters such as coal burst and rock burst. [8][9][10] This has an impact on underground equipment and production systems and poses a threat to the safety of underground personnel. [11][12][13][14] Hence, it is necessary to elucidate the law of mining disturbance's influence on the abutment stress of the stope and roadway, which can provide some guidance for the safety of underground activities.…”

Section: Introductionmentioning

confidence: 99%

A new theoretical method for calculating front abutment stress during coal mining

Liu

Wang

Liu

et al. 2019

Energy Science & Engineering

Self Cite

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The calculation of abutment stress has always been the most important topic in safe underground mining and design. In this paper, based on the formation mechanism of abutment stress, combined with the mechanical properties of actual strata and the theory of elastic foundation beams, a structure model of overlying strata with an elastic foundation is established, and a new theoretical calculation method of abutment stress is proposed. The new calculation method takes into account the interaction of the overlying key strata and the effect on the transmission of the front abutment stress and then analyzes the stress patterns of multilayered key strata under the combined action of the bending moment, shear force, and nonuniform load and its transmission to the underlying strata. In addition, based on field observations of panel 10 305 in the Xinglongzhuang coalmine, the influence range, peak position, and variation trend of the front abutment stress before and after breaking of the overlying key strata are studied and verified. The results show that the influence range of the abutment stress remains unchanged after KS1 breaks (eg, from 0 to 180 m), and its peak position shifts forward from 8 to 19 m, while the influence range (0‐180 m) and its peak position (6‐8 m in front of coal wall) remain unchanged after KS2 breaks; the abutment stress decreases, and the maximum decrease is 3.9 MPa in the range of 0‐22 m ahead of the coal wall after KS1 breaks, while the maximum decrease in the abutment stress is 2.1 MPa in the range of 0‐71 m ahead of the coal wall after KS2 breaks. The results of the new calculation method are basically consistent with the field observations and the existing theoretical results, showing that the method has good adaptability and reliability and can provide a new theoretical basis for on‐site design and construction practices.

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Investigation of impact rock burst induced by energy released from hard rock fractures

Cited by 19 publications

References 11 publications

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

An Investigation of Using Thermoset Polymer Type Liquid Additives to Improve Cement Grout Performances in Rock Bolting Applications

Study on the Evolution Law of Overburden Breaking Angle under Repeated Mining and the Application of Roof Pressure Relief

A new theoretical method for calculating front abutment stress during coal mining

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