Experimental study on the influence mechanism of gas seepage on coal and gas outburst disaster

Peng, Shoujian; Xu, Jiang; Yang, Hongwei; Liu, D.

doi:10.1016/j.ssci.2011.08.027

Cited by 85 publications

(31 citation statements)

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“…So here, these nine parameters involved in outburst are selected as the main parameters to construct the interaction matrix and to establish the assessment system, and the suggested rating values of these nine parameters can be seen in Iable 2. According to the constructing principIes of interaction matrix described in Section 3.1, the nine main parameters are located along the diagonal elements and the interacting actions between each two parameters are placed in the corresponding off-diagonal elements, thus a 9 x 9 square interaction matrix including 9 diagonal terms and 81 off-diagonal terms is constructed (see Figure 3) to represent the outburst system, here the interaction matrix constructing was carried out mainly based upon the knowledge obtained fram the previous studies [60][61][62][63][64][65][66] and the author's experiences . For the coding of the established interaction matrix, here we also use the ESQ coding systems suggested by Hudson [3] (see Table 3).…”

Section: Formulating the Outburst Assessmentmentioning

confidence: 99%

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

Zhou

Herrera

Hidalgo

2017

International Journal of Mining, Reclamation and Environment

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ABSTRAeTIn this study, a new approach is proposed and developed for evaluating the comprehensive outburst index (range between Oand 100), which is a quantitative assessment approach and will enable us to better understand the risk degree of coal and gas outburst in coal mines. By selecting some typical risk-free and high-risk outburst mines from China as the evaluation targets, we assessed their comprehensive outburst indexes with the developed approach. The assessment results are fully consistent with the actual situations, which indicates that our new developed approach is reliable and can be recommended for applying in more coal mines.

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Section: Formulating the Outburst Assessmentmentioning

confidence: 99%

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

Zhou

Herrera

Hidalgo

2017

International Journal of Mining, Reclamation and Environment

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“…Sobczyk et al constructed a self-development two-dimensional load test equipment, then carried out a series of experiments to study the relationship between the uniaxial compressive strength, gas pressure and the outburst risk [12][13][14]. Peng et al used outburst test equipment to analyze the influence of permeability and non-uniform loading, gas pressure and moisture content [15][16][17]. In the recent two years, scholars such as Tu [18], Zhao [19] and Xu [20] studied the effects of gas enrichment and adsorption on the outburst by simulation tests.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Impactive Dynamic Effect of Gas-Pulverized Coal of Coal and Gas Outburst

Sun

Cao

et al. 2018

Energies

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Coal and gas outburst is one of the major serious natural disasters during underground coal, and the shock air flow produced by outburst has a huge threat on the mine safety. In order to study the two-phase flow of a mixture of pulverized coal and gas of a mixture of pulverized coal and gas migration properties and its shock effect during the process of coal and gas outburst, the coal samples of the outburst coal seam in Yuyang Coal Mine, Chongqing, China were selected as the experimental subjects. By using the self-developed coal and gas outburst simulation test device, we simulated the law of two-phase flow of a mixture of pulverized coal and gas in the roadway network where outburst happened. The results showed that the air in the roadway around the outburst port is disturbed by the shock wave, where the pressure and temperature are abruptly changed. For the initial gas pressure of 0.35 MPa, the air pressure in different locations of the roadway fluctuated and eventually remain stable, and the overpressure of the outburst shock wave was about 20~35 kPa. The overpressure in the main roadway and the distance from the outburst port showed a decreasing trend. The highest value of temperature in the roadway increased by 0.25 • C and the highest value of gas concentration reached 38.12% during the experiment. With the action of shock air flow, the pulverized coal transportation in the roadway could be roughly divided into three stages, which are the accelerated movement stage, decelerated movement stage and the particle settling stage respectively. Total of 180.7 kg pulverized coal of outburst in this experiment were erupted, and most of them were accumulated in the main roadway. Through the analysis of the law of outburst shock wave propagation, a shock wave propagation model considering gas desorption efficiency was established. The relationships of shock wave overpressure and outburst intensity, gas desorption rate, initial gas pressure, cross section and distance of the roadway were obtained, which can provide a reference for the protection of coal and gas outburst and control of catastrophic ventilation.Keywords: coal and gas outburst; laboratory simulation experiment; two-phase flow of a mixture of pulverized coal and gas; shock wave; propagation model

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“…CGOBs are controlled by multiple factors, such as stress, gas, physical, and mechanical properties of coal [5][6][7][8][9][10][11][12]. Capturing characteristic information before the disaster occurs is crucial to achieve accurate and timely warning.…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Relationship between MS Frequency Response and Coal and Gas Outburst

Zhu

Li²,

Feng

et al. 2018

Shock and Vibration

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Microseismic (MS) frequency response is an important part of high-efficiency data mining to achieve the aim of coal and gas outburst (CGOB) early warning. Based on the variation pattern of acoustic emission (AE) signal in the coal failure process, the experimental characteristics of MS activity and typical signals CGOB were obtained in this study. First, the AE behavior of coal failure experiment was studied, and an explanation of laws was provided as follows: the fracture behavior of coal sample exhibits certain characteristics of AE response in terms of AE event count, signal amplitude, and frequency; each stage has its own physical meaning during the process of loading test. Based on these laws, CGOB experiments were carried out using a large CGOB physical simulation system with a MS monitoring system. Notching filter and wavelet packet transform technique were used in the denoising and feature extraction of six typical MS events (signals). The features of each stage, including the time-frequency domain, were extracted and quantitatively expressed. We finally arrive at the following conclusions: (1) CGOB exhibits significantly periodic characteristics, and each CGOB stage corresponds to the significant response characteristics of MS. CGOB presents varying characteristics, such as "valley-peaks-valley". (2) From the incubation stage to happen stage of outburst, the spectrum significantly moved from extremely low frequency (100-200 Hz) to high-frequency band (approach to 1600 Hz). During the residual stage, MS frequency manifested the concentration distribution (50 Hz) and offered the advantage of energy concentration. (3) The phenomenon of signal energy also shows the trend of energy transform low to high and to low modes along with the process. Signals total energy distribution (42.81%, 1,437.5-1,812.5 Hz) in the happen stage are markedly larger than those of events in incubation stage (7.01%) and residual stage (1.44%). The methodology presented in this paper for CGOB signal analysis provides a new method to obtain MS response precursor and predict CGOB disaster. This approach can be useful for rockburst anticipation and control during mining in gas and highly stressed coal mines.

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Experimental study on the influence mechanism of gas seepage on coal and gas outburst disaster

Cited by 85 publications

References 1 publication

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

Development of a quantitative assessment approach for the coal and gas outbursts in coal mines using rock engineering systems

Experimental Research on the Impactive Dynamic Effect of Gas-Pulverized Coal of Coal and Gas Outburst

An Experimental Investigation on the Relationship between MS Frequency Response and Coal and Gas Outburst

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