Mechanism of rock burst induced by fault slip in an island coal panel and hazard assessment using seismic tomography: a case study from Xuzhuang colliery, Xuzhou, China

Wang, Changbin; Cao, Anye; Zhu, Guang-an; Jing, Guangcheng; Li, Jing; Tian, Chen

doi:10.1007/s12303-016-0065-2

Cited by 37 publications

(17 citation statements)

References 20 publications

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“…Mininginduced tremors located by an MS monitoring system offered an easy way in which to conduct seismic velocity tomography. Time-related parameters pertaining to tremors were calculated to generate velocity tomograms using the simultaneous iterative reconstructive technique (SIRT) algorithm [19][20][21][22]. Research findings reveal that high-velocity regions are consistent with areas of high-stress concentration, and the locations where strong tremors occur in later mining.…”

Section: Roles Of Strong Tremor Disturbance and High-stress Concentramentioning

confidence: 99%

“…Note that a rockburst is more likely to occur in areas with high-stress concentration. Conversely, they do not occur readily in areas of low stress concentration because strong tremors with high seismic energies are needed in such circumstances and such events are rare; for examples, in some areas at a working face where there are folds and coal pillars, coal-rock masses are likely to store signi cant elastic energy after the mining-induced stress is superimposed on the tectonic stress or the stress imposed by coal pillars [22,25,26]. When the coalface is advanced to these regions that had high-stress concentrations, rockbursts are prone to occur therein.…”

Section: Shock and Vibrationmentioning

confidence: 99%

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Generating Behaviors of Strong Tremors and Experimental Study of Rockburst‐Triggering Criterion

Wang

Jin

Gong

et al. 2019

Shock and Vibration

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Numerous tremors occur during excavation and mining periods in coal mines, and low-energy tremors often occur before strong tremors. In addition, it is found that not all strong tremors cause rockbursts. Therefore, generating behaviors of strong tremors and the triggering criterion for the occurrence of the rockburst must be investigated. In this study, generating behaviors of strong tremors were inferred by velocity tomograms and energy density clouds. An innovative facility capable of applying dynamic disturbance to roadway models was developed to study the triggering criterion for rockbursts. Velocity tomograms indicated that the stress concentration extended to the syncline region with the advance of the coalface. High-energy-density clouds expanded rapidly and regularly in some areas that were parts of the high-velocity region, indicating that the stress increased rapidly in these areas, until strong tremors took place nearby. AE activities suggested that the modelled roadway offered good resistance as the dynamic loading energy grew from 29.4 J to 117.6 J. Then, sharp AE activity at the dynamic loading energy of 147 J indicated the ultimate shock resistance of the roadway was almost reached. Finally, bursting failure of the modelled roadway was observed at a dynamic loading energy of 176.4 J.

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Section: Roles Of Strong Tremor Disturbance and High-stress Concentramentioning

confidence: 99%

Section: Shock and Vibrationmentioning

confidence: 99%

Generating Behaviors of Strong Tremors and Experimental Study of Rockburst‐Triggering Criterion

Wang

Jin

Gong

et al. 2019

Shock and Vibration

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“…When considering coal and rock mass as ideal elastic body [18,19], the results of elastic theory can be directly used to study the propagation of pulse stress wave, which conforms to the generalized Hooke's law. Because the pulse stress wave produced by pulsed pump is sinusoidal, its stress can be expressed as follows:…”

Section: Hpphf Mechanismmentioning

confidence: 99%

The Enhancement of Lump Coal Percentage by High-Pressure Pulsed Hydraulic Fracturing for Sustainable Development of Coal Mines

et al. 2019

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The enhancement of lump coal percentage (LCP) is of great significance for most aging mines to achieve the production reduction and quality improvement. In order to enhance the LCP of hard coal seam in fully mechanized mining face and prolong the service life of aging mines, this paper puts forward the technological path of LCP enhancement using high-pressure pulsed hydraulic fracturing (HPPHF) based on the detailed analysis of the main factors controlling LCP. By analyzing the correlation between coal fracturing and LCP, the enhancement mechanism of LCP through HPPHF was concluded. Using the extended finite element method, a fluid–solid coupling numerical model of high-pressure pulsed water injection into coal seam was established, and effects of the fracturing method, pulse amplitude, pulse frequency, and water injection pressure on fracturing performance were assessed. Simulation results demonstrate that HPPHF can effectively reduce the required maximum pressure in fracturing, thus providing a higher percentage of coal lumps with lower energy consumption through the repeated pulsed loading of coal masses. Variations in pulsed pressure amplitude and frequency, as well as water injection pressure were positively correlated with fracturing performance. By their effect on the fracturing performance, we found that water injection pressure had the greatest influence, and the pulse amplitude and frequency had similar effects. At the same time, “high amplitude-high frequency” and “high amplitude-low frequency” had characteristics of short initiation time, large initiation pressure, but small fracture width, while “low amplitude-high frequency” and “low amplitude-low frequency” had characteristics of slow initiation speed, low initiation pressure, but large fracture width. Through the field test results in the fully mechanized mining face of Shichangwan Coal Mine, it was found that LCP with a diameter range of 13–100 mm was significantly enhanced by HPPHF. The present study is considered quite instrumental in providing a theoretical foundation for enhancing the LCP of hard coal seams and the sustainable development of coal mine enterprises.

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“…Wang et al (2016) and Wang et al (2019) used abrupt stress and abrupt displacement information to determine whether a fault was activated and designed a new anchor support method. Wang et al (2017) used tomography to study the sliding mechanism of a fault during underground mining and found that the time interval between two fault slips has a positive correlation with the energy released therein. Piotr et al (2017) took the occurrence of fault roadway failure and supporting deformation as the research object to numerically analyse the influence law of faults affecting the deformation of roadway surrounding rock via dozens of rock mass parameters.…”

Section: Introductionmentioning

confidence: 99%

A physical model study of surrounding rock failure near a fault under the influence of footwall coal mining

Shu-kun

Wang

et al. 2020

Int J Coal Sci Technol

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A study of the deformation of the surrounding rock and coal pillars near a fault under the influence of mining is conducted on a physical model for the design of coal pillars to support and maintain the roofs of adjacent fault roadways. This research is based on the 15101 mining face in the Baiyangling Coal Mine, Shanxi, China, and uses simulation tests similar to digital speckle test technology to analyse the displacement, strain and vertical stress fields of surrounding rocks near faults to determine the influence of the coal pillar width. The results are as follows. The surrounding rock of the roadway roof fails to form a balance hinge for the massive rock mass. The vertical displacement, vertical strain and other deformation of the surrounding rock near the fault increase steeply as the coal pillar width decreases. The steep increase in deformation corresponds to a coal pillar width of 10 m. When the coal pillar width is 7.5 m, the pressure on the surrounding rock near the footwall of the fault suddenly increases, while the pressure on the hanging wall near the fault increases by only 0.35 MPa. The stress of the rock mass of the hanging wall is not completely shielded by the fault, and part of the load disturbance is still transmitted to the hanging wall via friction. The width of the fault coal pillars at the 15101 working face is determined to be 7.5 m, and the monitoring data verify the rationality of the fault coal pillars.

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Mechanism of rock burst induced by fault slip in an island coal panel and hazard assessment using seismic tomography: a case study from Xuzhuang colliery, Xuzhou, China

Cited by 37 publications

References 20 publications

Generating Behaviors of Strong Tremors and Experimental Study of Rockburst‐Triggering Criterion

Generating Behaviors of Strong Tremors and Experimental Study of Rockburst‐Triggering Criterion

The Enhancement of Lump Coal Percentage by High-Pressure Pulsed Hydraulic Fracturing for Sustainable Development of Coal Mines

A physical model study of surrounding rock failure near a fault under the influence of footwall coal mining

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