Combined Early Warning Method for Rock Burst and Its Engineering Application

Qin, Zhangrong; Li, Tan; Chen, Guangbo; Cao, Bin

doi:10.1155/2019/1269537

Cited by 9 publications

(3 citation statements)

References 33 publications

(26 reference statements)

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“…Therefore, the drilling cuttings method is a common and highly recognized technical means in coal mine rockburst hazard monitoring. Qin et al 16 improved the drill cuttings method to reflect the stress variation in the deeper part of the coal body. Wang et al 17 deduced the theoretical formula of the drilling cutting weight in the plastic coal mass, and the results were consistent with the field measurement results.…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of drilling cuttings considering stress zoning of surrounding rock and its application in stress detection

Geng

Tan

Yin

et al. 2023

Energy Science & Engineering

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Drilling cuttings method is a commonly used method to detect the risk of rockburst, which has been widely recognized and applied in coal mines.However, in the current theoretical research on the relationship between drilling cuttings method and coal stress, it is generally considered that the mechanical parameters of coal at different positions of roadway are unchanged, and the influence of surrounding rock plastic zone and elastic zone is not considered. Therefore, according to the secondary distribution characteristics of roadway side stress, the theoretical calculation formula of drilling cuttings in the plastic zone and elastic zone of the roadway side is established in this paper. The example shows that the distribution of cuttings on the roadway side is obviously consistent with the abutment pressure. The cuttings in the plastic zone and the elastic zone are in linear and power function with the coal stress, respectively, and the cuttings in the plastic zone are greater than those in the elastic zone. With the increase of the hole diameter, the slope of the relationship curve between the drill-cutting weight and stress gradually increases, and the response of the drill-cutting weight with a large hole diameter to the change of coal stress is more obvious. The numerical simulation results show that the error of the theoretical calculation formula of the drilling cuttings method is less than 9%, which can meet the engineering application needs of estimating the drill-cutting weight in coal and the stress of coal. Using the theoretical formula, the stress field in the leading area of the working face is measured, and the leading influence range and the accurate position of the high stress concentration area are determined, which provides more comprehensive stress information for the early warning of impact danger and pressure relief.

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Section: Introductionmentioning

confidence: 99%

Theoretical analysis of drilling cuttings considering stress zoning of surrounding rock and its application in stress detection

Geng

Tan

Yin

et al. 2023

Energy Science & Engineering

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“…As common catastrophic accidents in underground engineering (such as mining, tunnel, and water conservancy engineering), rock burst and large deformation of soft rock not only cause significant property losses, but also pose a serious threat to the safety and productivity of underground projects (Jiang et al, 2017;Zhang et al, 2017). In terms of engineering practice, drilling method (Qin et al, 2019), infrared radiation, electromagnetic radiation (Tian et al, 2016;Zhou et al, 2019;Zhou C. H. et al, 2020), microseism (Cai et al, 2014;He et al, 2017;Wang et al, 2021), and other early warning monitoring methods have been widely used in underground engineering, playing an important role in disaster early warning. However, most of them are present in existing projects, and all come from the site monitoring and conceptual model of the project.…”

Section: Introductionmentioning

confidence: 99%

Research on Failure Precursor Based on Characteristics of Energy Dissipation Rate for Rock

et al. 2022

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Research on early warning of rock disaster based on the energy theory is closer to the essence of rock failure. In this paper, static compression tests and acoustic emission (AE) tests of coal rock under 0, 8, 16, and 25 MPa confining pressures were carried out on the MTS815 test system. Energy evolution law in the rock failure process was analyzed according to the relationship between mechanical parameters, AE parameters, and energy dissipation rate (EDR) in the rock failure process. Eventually, a new index for evaluating rock failure precursors was proposed based on EDR. The results show that the EDR has a good correlation with mechanical strength and AE events under different confining pressures. The deformation and failure characteristics of coal rock can be truly characterized by EDR. The variation of EDR can be divided into a quiet stage, a stable increasing stage, an active stage, and a stable stage. The EDR level in the quiet stage is obviously enhanced by confining pressure. When EDR reaches the peak, AE events increase rapidly. In the active stage, the EDR peak value is concentrated and large, the AE event is highly active, and stress drops abruptly, indicating that the EDR is reliable for evaluating the rock failure process. Compared with AE test results, it is found that the warning stress and warning time of the EDR failure precursor occur later than that of the AE failure precursor, and the former is closer to the peak stress of rock, which is more universal in engineering and could provide a better reference value for preventing rock disaster.

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“…It found that it has obvious response law to the rock burst events of steeply inclined and extremely thick coal seam, which provided a solid foundation for the safe mining of such coal seam. Qin et al [31] proposed an improved drill cutting method to make up for the defects of traditional drilling cutting method where the depth cannot reach the stress concentration area and cannot accurately reflect the internal stress variations of coal body. After the combination of improved drilling cutting method and the MS monitoring system, it overcomes the limitations of a single method and has achieved successful application in the underground.…”

Section: Introductionmentioning

confidence: 99%

GA-Based Early Warning Method for Rock Burst with Microseismic and Acoustic Emission in Steeply Inclined Coal Seam

Xue

Song

Chen

et al. 2020

Shock and Vibration

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Aiming at problem of low efficacy of early warning of rock burst in coal mine, a multisystem and multiparameter integrated early warning method based on genetic algorithm (GA) is proposed. In this method, firstly, the temporal-spatial-intensity information of energy incubation process of rock burst is deeply mined, and the multidimensional precursory characteristic parameter system of rock burst is constructed. Secondly, the genetic algorithm is used to train the historical monitoring data to obtain the optimal critical value and fitness value of each precursory characteristic parameter, and then the early warning index WC of each monitoring system is calculated. Finally, the integrated rock burst early warning index IC is obtained by synthesizing the early warning index WC of each system. The value of IC corresponds to the specific rock burst risk level of the mine. This method is applied to Wudong coal mine in Xinjiang, China. Based on the actual situation of the mine, a multidimensional precursory characteristic parameter system of rock burst is constructed, which includes energy deviation (DE), frequency ratio (Fr), frequency deviation (DF), degree of dispersion (DS), and total high value of energy deviation (DH). After analyzing the rock burst danger status and risk level in the monitoring area, the early warning capability of this method is found to reach 0.896. Combining with the specific prevention and control measures corresponding to different rock burst risk levels, it can provide effective guidance for the field work.

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Combined Early Warning Method for Rock Burst and Its Engineering Application

Cited by 9 publications

References 33 publications

Theoretical analysis of drilling cuttings considering stress zoning of surrounding rock and its application in stress detection

Theoretical analysis of drilling cuttings considering stress zoning of surrounding rock and its application in stress detection

Research on Failure Precursor Based on Characteristics of Energy Dissipation Rate for Rock

GA-Based Early Warning Method for Rock Burst with Microseismic and Acoustic Emission in Steeply Inclined Coal Seam

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