Research on the Energy Criterion for Rockbursts Induced by Broken Hard and Thick Rock Strata and Its Application

Wang, Jun; Ning, Jianguo; Jiang, Jinquan; Bu, Tengteng; Shi, Xinshuai

doi:10.1007/s10706-016-0137-0

Cited by 23 publications

(12 citation statements)

References 11 publications

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“…The complexity of geological coal seam phenomena 1 such as extra-thick coal seams under hard roof condition leads to accidents such as support crushing, 2 high-degree weighting, 3 rock burst, 4,5 and coal and gas outbursts. 6,7 Subsequently, these conditions impact fractures in top coal caving, [8][9][10] which hinders the safe and efficient mining operations in longwall top coal caving (LTCC) regions.…”

Section: Introductionmentioning

confidence: 99%

Case study on the mining‐induced stress evolution of an extra‐thick coal seam under hard roof conditions

Xie

Gao

et al. 2020

Energy Science & Engineering

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A strong mining disturbance may cause the superposition of local stresses and serious disasters such as crushed supports and severely destroyed roadways. To study the distribution law of mining‐induced stress under hard roof conditions, an advance abutment pressure distribution model was developed. By monitoring the support pressure, a novel method of reckoning intensive factors was proposed, and then, the pressure distribution characteristics were obtained. An innovative in situ test of the mining‐induced stress increment was performed. At the Tongxin coal mine, the field monitoring of no. 8309 working face revealed the following. (a) The peak position of the fully mechanized working face with a hard roof was 5.9 m away from the mining face in which the average intensive factor K was 1.48. The pressure of the single props developed could be roughly divided into the fluctuation, slow increase, and stable stages. (b) A theoretical model of the stress evolution of the working face was proposed. Using an in situ uniaxial compression test, a law governing the variation of the advance abutment pressure was developed. The peak strength was reported to be 36 MPa, which is consistent with the advance prop pressure. (c) Mining‐induced stress violently fluctuated during the process of top coal caving; the K values in the supports in the middle of the working face and their rates of growth were apparently higher than those in the end supports. A Gaussian distribution of K was established for this phenomenon. The results obtained provide first‐hand data for safe and efficient mining under similar geological conditions.

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Section: Introductionmentioning

confidence: 99%

Case study on the mining‐induced stress evolution of an extra‐thick coal seam under hard roof conditions

Xie

Gao

et al. 2020

Energy Science & Engineering

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“…Numerous studies have been performed using different methods to estimate the energy evolution due to excavation . Some researchers have analyzed the energy change with in situ investigations based on feedback analysis of acoustic emissions and microseismic and stresses .…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have been performed using different methods to estimate the energy evolution due to excavation. [10][11][12][13] Some researchers have analyzed the energy change with in situ investigations based on feedback analysis of acoustic emissions and microseismic and stresses. [14][15][16] Their results indicate that energy changes due to excavation are associated with in situ stress, geological and geotechnical conditions.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of the mining‐induced energy redistribution in a coal seam adjacent to an extracted coal panel during longwall face mining: A case study

Wang

Qiu

Ning

et al. 2019

Energy Science & Engineering

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Mining of the coal seam adjacent to the extracted coal panel is widely practiced in China to improve coal resource recovery rates, but the energy change associated with longwall mining may present a new risk to ground stability and gateroad failure. To understand the energy change effectively, a meticulously validated numerical model, built using FLAC3D software, incorporating a double‐yield model for the gob materials and a strain‐softening model for the coal/rock masses, was developed to investigate the energy redistribution in coal seams and barrier pillars during the process of mining the coal seam adjacent to the extracted coal panel. The model results showed that the closer the region was to the LW 5301 gob, the higher the location and magnitude of the peak strain energy density. Consequently, the risk of rockburst in coal seams was greater than that in barrier pillars. Along the coal seam strike, with increasing advancing distance from the setup room, the magnitude of the peak strain energy density gradually increased to 1.88‐2.78 times the premining energy level. In addition, along the coal seam dip, the maximum distance from the peak strain energy density to the edge of the coal seam was approximately 16‐28 m, which is greater than that in the barrier pillar. The proposed numerical simulation procedure and calibrated method could be a viable alternative approach to evaluate longwall mining‐induced energy changes.

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“…However, different to other mechanical phenome, it is nearly impossible to rebuild the real occurrence of rock burst in the laboratory resulting in the uncertain of its generation mechanisms and failure mode of surrounding rock. These research methods can be classified in three categories: (a) physical simulation study with similar material, (b) theoretical analysis thorough finite element simulation, and (c) monitoring in field application [6,[8][9][10]. In the first category, the physical simulation is mainly carried out by means of drilling the hole to simulate the tunnel after the balance of the model, followed by the artificial explosive near the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Vibration Effect of Shock Wave in Rock Burst by In Situ Microseismic Monitoring

Gao

Zhao

et al. 2018

Shock and Vibration

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Rock burst is a physical explosion associated with enormous damage at a short time. Due to the complicity of mechanics of rock burst in coal mine roadway, the direct use of traditional investigation method applied in tunnel is inappropriate since the components of surrounding rock are much more complex in underground than that of tunnel. In addition, the reliability of the results obtained through these methods (i.e., physical simulation, theoretical analysis, and monitoring in filed application) is still not certain with complex geological conditions. Against this background, present experimental study was first ever conducted at initial site to evaluate the effect of shock wave during the rock burst. TDS-6 microseismic monitoring system was set up in situ to evaluate the propagation of shock wave resulting in microexplosions of roadway surrounding rock. Various parameters including the distance of epicentre and the characteristic of response have been investigated. Detailed test results revealed that(1)the shock wave attenuated exponentially with the increase of the distance to seismic source according to the equation ofE=E0e-ηl; particularly, the amplitude decreased significantly after being 20 m apart from explosive resource and then became very weak after being 30 m apart from the seismic source;(2)the response mechanics are characteristic with large scatter based on the real location of surrounding rock despite being at the same section. That is, the surrounding rock of floor experienced serious damage, followed by ribs, the roof, and the humeral angles. This in situ experimental study also demonstrated that microseismic monitoring system can be effectively used in rock burst through careful setup and data investigation. The proposed in situ monitoring method has provided a new way to predict rock burst due to its simple instalment procedure associated with direct and reasonable experimental results.

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Research on the Energy Criterion for Rockbursts Induced by Broken Hard and Thick Rock Strata and Its Application

Cited by 23 publications

References 11 publications

Case study on the mining‐induced stress evolution of an extra‐thick coal seam under hard roof conditions

Case study on the mining‐induced stress evolution of an extra‐thick coal seam under hard roof conditions

A numerical study of the mining‐induced energy redistribution in a coal seam adjacent to an extracted coal panel during longwall face mining: A case study

Investigation on the Vibration Effect of Shock Wave in Rock Burst by In Situ Microseismic Monitoring

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