Rock burst risk in an island longwall coal face by stress field

2018 ◽  
Vol 22 (4) ◽  
pp. 609-622 ◽  
Author(s):  
Guangjian Liu ◽  
Zonglong Mu ◽  
Jianjun Chen ◽  
Jing Yang ◽  
Jinglong Cao
Keyword(s):  
Stress Field ◽  
Rock Burst ◽  
Coal Face ◽  
Rock Burst Risk

scholarly journals Reasonable Determination of Terminal Mining Lines Using the Stress Field with Seismic Wave Excitation in Deep Coalfaces

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Guang-an Zhu ◽  
Huan Liu ◽  
Bo-ru Su ◽  
Qi-peng Jiang ◽  
Hai-yang Liu
Keyword(s):  
Stress Field ◽  
Theoretical Analysis ◽  
Rock Burst ◽  
Seismic Wave ◽  
Coal Mine ◽  
Evaluation Method ◽  
Coal Pillar ◽  
Field Observations ◽  
Wave Excitation ◽  
Rock Burst Risk

Many field observations have shown that rock bursts occur frequently near the terminal mining line (TML) and dip coal pillar area in deep coalfaces. Taking the “7.26” rock burst in coalface 3302 in Xingcun Coal Mine as an example, the rock burst mechanism was investigated based on theoretical analysis and field observations, and a combined evaluation method using the stress field under seismic wave excitation was established to determine the reasonable TML of coalface 3302. Firstly, the static geological data revealed during roadway excavation were used for preevaluation of rock burst risk at the working face. By theoretically analyzing the stress transfer mechanism of the two types of the roof structure, the computational model of abutment pressure was established and the calculation method giving the abutment stress was proposed. Subsequently, a dynamic evaluation method that adopts microseismic and stress online monitoring system to monitor dynamic information, such as mine tremors and stress during coalface mining, was developed to define stress anomaly areas and then dynamically determine the TML. Finally, the proposed model was used to optimize the position of the TML of LW3302 in Xingcun Coal Mine; findings obtained in this study provide theoretical guidance for safe coal mining. Combined with the results of theoretical analysis (255 m), online stress monitoring (200 m), microseismic (MS) monitoring (262 m), and passive seismic velocity tomography (220–250 m), it can be finally determined that the width of the protective coal pillar for the TML of coalface 3302 should be at least 262 m.

Analysis on rock burst danger when fully-mechanized caving coal face passed fault with deep mining

2012 ◽  
Vol 50 (4) ◽  
pp. 645-648 ◽  
Author(s):  
Xuehua Chen ◽  
Weiqing Li ◽  
Xianyang Yan
Keyword(s):  
Rock Burst ◽  
Coal Face ◽  
Deep Mining

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

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Yarong Xue ◽  
Dazhao Song ◽  
Zhenlei Li ◽  
Jianqiang Chen ◽  
Xueqiu He ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Rock Burst ◽  
Coal Mine ◽  
Early Warning ◽  
Characteristic Parameter ◽  
Control Measures ◽  
Risk Level ◽  
Parameter System ◽  
Fitness Value ◽  
Rock Burst Risk

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.

Prediction of rock-burst-threatened areas in an island coal face and its prevention: A case study

2016 ◽  
Vol 26 (6) ◽  
pp. 1125-1133 ◽  
Author(s):  
Xuehua Li ◽  
Fan Pan ◽  
Huaizhen Li ◽  
Min Zhao ◽  
Lingxiao Ding ◽  
...  
Keyword(s):  
Rock Burst ◽  
Coal Face

scholarly journals Research of Rock Burst Risk Induced by Mining and Field Case in Anticlinal Control Area

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Shitan Gu ◽  
Zhimin Xiao ◽  
Bangyou Jiang ◽  
Ruifeng Huang ◽  
Peng Shan
Keyword(s):  
Rock Burst ◽  
Abutment Pressure ◽  
Elastic Strain Energy ◽  
Tectonic Stress ◽  
Residual Energy ◽  
Theoretical Research ◽  
Energy Principle ◽  
Unique Type ◽  
Working Face ◽  
Rock Burst Risk

Stress concentration caused by tectonic stress and mining disturbance in coal mines induces a unique type of rock burst. No. 3201 working face controlled by an anticline structure in the Shandong mining area is used as the research background. The formation mechanism for anticlines is analyzed. Theoretical research shows that the bigger the tectonic couple is, the smaller the foundation stiffness, and the greater the bending degree and elastic strain energy of the coal will be. The distribution characteristics of abutment pressure and maximum principle stress in anticlinal control areas are analyzed using UDEC numerical software. The results show that rock bursts result from interactions between abutment pressure and residual tectonic stress. The “connection-overlay-separation” phenomenon of abutment pressure presents with working face advancement. Furthermore, the energy criterion for rock burst initiation is established based on the energy principle. Residual energy “E0−EC” and rock burst danger characteristics during mining are discussed. Based on the simulation results, microseismic monitoring data for No. 3201 working face are analyzed, and the law of microseismic energy is consistent with the variation law for the residual energy “E0−EC” at the peak of the simulated abutment pressure. The microseismic energy and frequency are higher during mining, increasing the risk of rock burst events. It can provide scientific basis for prevention and control of rock burst.

Rock burst risk assessment in deep-buried underground caverns: a novel analysis method

2020 ◽  
Vol 13 (11) ◽  
Author(s):  
Zhiqiang Li ◽  
Yiguo Xue ◽  
Shucai Li ◽  
Daohong Qiu ◽  
Lewen Zhang ◽  
...  
Keyword(s):  
Risk Assessment ◽  
Rock Burst ◽  
Analysis Method ◽  
Underground Caverns ◽  
Rock Burst Risk

scholarly journals Mechanism and Control of Roadway Floor Rock Burst Induced by High Horizontal Stress

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Dongming Guo ◽  
Xinchao Kang ◽  
Zhiying Lu ◽  
Qiyu Chen
Keyword(s):  
Rock Burst ◽  
Prevention And Control ◽  
Large Diameter ◽  
Horizontal Stress ◽  
Steel Tube ◽  
Pressure Relief ◽  
Floor Rock ◽  
Concrete Filled Steel Tube ◽  
Rock Burst Risk ◽  
And Control

According to the characteristics of rock burst of high horizontal stress roadway floor, the rock burst mechanism of roadway floor was studied with the background of south track roadway Xing’an mine. Based on the deflection theory and energy principle of the slab, the mechanical model of the floor of the roadway under high horizontal stress was established, the stress and energy criteria of rock burst occurred in the floor of the roadway were deduced, the prevention and control measures of the floor pressure relief with large diameter borehole and concrete-filled steel tube pile support were put forward, and the key parameters were determined. By establishing a numerical model, the evolution law of plastic zone, horizontal stress, and elastic strain energy density of roadway floor with or without support is contrastively analyzed. The results show that the effective means to prevent and control the floor rock burst is to cut off the stress transfer path by weakening the hard floor to reduce floor energy accumulation so as to reduce the floor rock burst risk. Based on the above research, field tests were carried out, and the microseismic monitoring results showed that the floor pressure relief of large diameter boreholes and concrete-filled steel tube pile support effectively relieved the floor rock burst and guaranteed the safety and efficiency of roadway excavation. This technology can provide a reference for the prevention and control of floor rock burst of similar roadways.

Deep Mining Optimization of Rock Burst Mines

2013 ◽  
Vol 448-453 ◽  
pp. 3859-3862
Author(s):  
Yong Mei
Keyword(s):  
Mechanical Properties ◽  
High Pressure ◽  
Rock Burst ◽  
Water Injection ◽  
Coal Face ◽  
Deep Mining ◽  
Organization Model ◽  
Pressure Water ◽  
Injection Effect ◽  
System Layout

To prevent threaten of impact disaster, high-pressure water is injected into coal face, which is most widely used in impact-type mine. In such cases, by analyzing the rock burst tendency of a particular type of deep mining pit and occurrence of the mining process, rock samples drilled from the coal mine were taken for the conventional mechanical properties test and rock burst tendency test respectively under dry and wet state. Cuttings volume indicator affected by injection has been optimized to improve the prediction sensitivity. "One shift anti-impact, two-shift production "patterns labor organization model, adjusted development system layout and cut drilling index optimizations, as well as the allocation of high-pressure water injection drilling means, greatly improving the water injection effect, which probably provide a reference for similar mines to safe and efficiently mining.

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