A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

Liu, Xuewei; Liu, Quansheng; Liu, Bin; Kang, Yongshui

doi:10.3390/en13071729

Cited by 12 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unload the weights when loading reaches 240 kg and the unloading path is consistent with the loading process. 3 Repeat step 2 three times so that each sensing unit has three loading and unloading cycles. 4 Repeat steps 1 -3 until all sensing units are calibrated.…”

Section: Calibration Testmentioning

confidence: 99%

Development of a FBG Stress Sensor for Geostress Measurement Using RSR Method in Deep Soft Fractured Rock Mass

et al. 2022

Self Cite

View full text Add to dashboard Cite

The rheological stress recovery (RSR) method was proposed to obtain measurements of in-situ stress. Rock stress can be evaluated by monitoring the recovery process of stress sensors embedded in rock mass. In order to achieve this application, a novel stress sensor employing the fiber Bragg grating (FBG) technique was designed and manufactured. This stress sensor consisted of three parts: A sensing spherical head, connecting rod, and coupler box. In the sensing spherical head, six independent pressure sensing units were assembled together with a temperature compensation unit. In addition, wavelength division multiplexing (WDM) technology was adopted to ensure that only one fiber splice for each stress sensor is output. The fiber splicing of the sensing units was assembled in the coupler box. The transformation equations from the six pressure sensing units to the stress sensor were established. Furthermore, a calibrating device for the stress sensor was designed, and the general calibration and long-term stability tests were carried out to investigate the characteristic indexes (maximum range, full-range output, and sensitivity) and measurement error (zero drift index, hysteresis index, and repeatability index). Measurement errors showed that the degrees of linearity, zero drift, hysteresis, and repeatability were all below 1.5%. The stability test indicated that the creep of the stress sensor can gradually stabilize in 24 days, and the errors were less than 1.5%. As a result, the stress sensor developed here satisfies the requirements for the RSR method and can be used in field.

show abstract

Section: Calibration Testmentioning

confidence: 99%

Development of a FBG Stress Sensor for Geostress Measurement Using RSR Method in Deep Soft Fractured Rock Mass

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…Cai et al 16 defined the seismic energy generated during strain energy transfer and proposed the bump strain energy index, calibrated by numerical simulation and applied to coal seam bump prediction. Liu et al 17 proposed the blast energy indicator, defined as the density ratio of the elastic strain energy at peak strength to the strain energy released after the peak. Luo and Gong et al 18 introduced the bending energy storage and bending energy dissipation coefficients.…”

Section: Introductionmentioning

confidence: 99%

Bursting Liability Criteria of Coal Mass Based on Energy Storage and Release Characteristics

et al. 2023

View full text Add to dashboard Cite

The bursting liability of coal, referring to the characteristic of coal to accumulate strain energy and produce impact damage, is an important factor influencing the occurrence and extent of rock burst disasters in coal mines. Two indicatorsthe elastic strain energy storage coefficient and energy release coefficientare proposed based on the energy evolution characteristics of different stages during rock bursts. Twelve coal specimens from typical mines were selected for uniaxial compressive tests to analyze the damage characteristics of three types of typical coal specimens with different impact damage intensities in different loading stages. The initial kinetic energy of the coal specimens was obtained according to the principle of horizontal projectile motion. The bursting liability rating criteria according to the energy storage coefficient and energy release coefficient were determined based on the damage and motion characteristics of the coal mass, damage acoustic characteristics, and damage initial kinetic energy. The study demonstrated that the discrimination results based on the new criteria of coal mass bursting liability were consistent with the actual bursting liability level of the coal mass, thus providing a new method for determining coal mass bursting liability.

show abstract

“…Microseismic monitoring is a technology used to monitor the subsurface fracturing of rocks due to human activities [1][2][3][4]. This is the first step in recognizing microseismic event signals for microseismic monitoring.…”

Section: Introductionmentioning

confidence: 99%

Three-Component Microseismic Data Denoising Based on Re-Constrain Variational Mode Decomposition

et al. 2021

View full text Add to dashboard Cite

Microseismic monitoring is an important technology used to evaluate hydraulic fracturing, and denoising is a crucial processing step. Analyses of the characteristics of acquired three-component microseismic data have indicated that the vertical component has a higher signal-to-noise ratio (SNR) than the two horizontal components. Therefore, we propose a new denoising method for three-component microseismic data using re-constrain variational mode decomposition (VMD). In this method, it is assumed that there is a linear relationship between the modes with the same center frequency among the VMD results of the three-component data. Then, the decomposition result of the vertical component is used as a constraint to the whole denoising effect of the three-component data. On the basis of VMD, we add a constraint condition to form the re-constrain VMD, and deduce the corresponding solution process. According to the synthesis data analysis, the proposed method can not only improve the SNR level of three-component records, it also improves the accuracy of polarization analysis. The proposed method also achieved a satisfactory effect for field data.

show abstract

A Modified Bursting Energy Index for Evaluating Coal Burst Proneness and Its Application in Ordos Coalfield, China

Cited by 12 publications

References 31 publications

Development of a FBG Stress Sensor for Geostress Measurement Using RSR Method in Deep Soft Fractured Rock Mass

Development of a FBG Stress Sensor for Geostress Measurement Using RSR Method in Deep Soft Fractured Rock Mass

Bursting Liability Criteria of Coal Mass Based on Energy Storage and Release Characteristics

Three-Component Microseismic Data Denoising Based on Re-Constrain Variational Mode Decomposition

Contact Info

Product

Resources

About