Study of the time–space–strength relation for mining seismicity at Laohutai coal mine and its prediction

Cai, Meifeng; Ji, Hong; Wang, J.A.

doi:10.1016/j.ijrmms.2004.08.001

Cited by 19 publications

(9 citation statements)

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“…The sudden relaxation of the rock mass at hypocentral depths of mining tremors results in propagation of seismic waves. Mining tremors are not only direct and instant dynamic vibrations but can also be characterised by the accumulated dynamic response of a rock mass disturbed by mining activities (Cai et al 2005). In the surface layer, surface waves are formed.…”

Section: Assumed Kinematic Loads and Dynamic Analysismentioning

confidence: 99%

Experimental and numerical analysis of an industrial RC tower

Tatara

Pachla

Kuboń

2016

Bull Earthquake Eng

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This study presents the results of analyses performed using a dynamic 3D model of a RC skip tower located at a coal mine in Poland. Kinematic excitation was based on acceleration records of a mining tremor (underground mining activity) and an earthquake. Although Poland is not a particularly active seismic region, there are regional seismic phenomena associated with mineral exploitation. These vibrations, generally connected with human activity, are so-called paraseismic events. Whilst mining-related surface vibrations show some similarities with natural earthquakes, there are also some differences. Dynamic calculations were performed in the time domain. Analysis of the results refers to the distribution of stresses and displacements which were compared to the limit values. An additional goal of the study was to examine the possibility of loss of structural stability and the risk of collapse. The reason for making the analysis was the fact that kinematic excitations of high structures had not been taken into account in the design procedure. Using actual recorded surface vibrations caused by rock burst and earthquake as kinematics loads allowed a comparison of the dynamic responses of the structure with two different seismic events.

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Section: Assumed Kinematic Loads and Dynamic Analysismentioning

confidence: 99%

Experimental and numerical analysis of an industrial RC tower

Tatara

Pachla

Kuboń

2016

Bull Earthquake Eng

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“…Production factors are mainly mining disturbance, including mining sequence, layout of working face, and advancing speed. Many scholars [7][8][9] have carried out a great deal of research on two aspects of inducing rock burst, of which the flexibility and variability of advancing speed are the most prominent among the production factors.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Advancing Speed and Stoping Time on the Energy Release of Overburden in an Upward Mining Coal Working Face with a Hard Roof

et al. 2019

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In order to study the influence of advancing speed and stoping time of a coal face on the scale and frequency of rock burst, the energy release characteristics of an overburden fracture under six advancing speeds and four stoping times are studied by theoretical analysis and similar simulation experiments. The distribution characteristics of microseismic events before and after stoppage are compared, and the load/unload response ratio is introduced to analyze the relationship between the synergistic effect of advancing speed and stoping time and the characteristics of microseismic events in coal and rock mass. The mechanism of rock burst induced by the advancing speed and stoping time effect in the working face is studied, and the coordinated regulation and mitigation of advancing speed and stoping time are analyzed and completed. The results show that the effect of advancement speed and stoping time is very important to the energy release of overburden. The energy released by microseismic events during stoping is exponentially related to the advancing speed. The change of advancing speed causes the change of microseismic event characteristics, reflecting the evolution process of overburden structure and its energy. During stoping, the secondary microseismic events disturbed by mining occur frequently, leading to the significant difference of energy released by microseismic events during stoping. After stoping, the microseismic energy is more than four times higher than that during the stop period, and the risk of coal seam impact is high during the stope period. The synergetic change of advancement speed and stoping time changes the cycle of energy accumulation and release. The response ratio of loading and unloading considering the effect of advancement speed and stoping time is established by using the corresponding ratio of loading and unloading, and the impact risk of the coal seam is quantitatively analyzed. Based on the monitoring and analysis of microseismic events, the safety mining index of coordinated control with the energy of a single microseismic event of 180 J is established, and the best advancing speed of the working face is determined to be 4 m/d. According to the corresponding ratio of loading and unloading, the reasonable stoping time of different advancing speeds and the corresponding advancing speed of different stoping times after the resumption of mining are determined, so as to provide a reference for the safe and efficient mining of similar rock burst mines.

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“…Under such high stress-disturbances, asymmetric deformation of coal-rock masses in mine voids is significantly different in ESTCS (Kose and Tatar 1997;Lai et al 2009a, b). Local strength degradation of surrounding rock may occur by asymmetric destabilization of mine voids that evolve into dynamic derivative hazards and are referred to as coal burst and dynamic collapse (Cai et al 2005).…”

Section: Introductionmentioning

confidence: 99%

Simulation of Asymmetric Destabilization of Mine-void Rock Masses Using a Large 3D Physical Model

et al. 2015

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When mechanized sub-horizontal section top coal caving (SSTCC) is used as an underground mining method for exploiting extremely steep and thick coal seams (ESTCS), a large-scale surrounding rock caving may be violently created and have the potential to induce asymmetric destabilization from mine voids. In this study, a methodology for assessing the destabilization was developed to simulate the Weihuliang coal mine in the Urumchi coal field, China. Coal-rock mass and geological structure characterization were integrated with rock mechanics testing for assessment of the methodology and factors influencing asymmetric destabilization. The porous rock-like composite material ensured accuracy for building a 3D geological physical model of mechanized SSTCC by combining multi-mean timely track monitoring including acoustic emission, crack optical acquirement, roof separation observation, and close-field photogrammetry. An asymmetric 3D modeling analysis for destabilization characteristics was completed. Data from the simulated hydraulic support and buried pressure sensor provided effective information that was linked with stress-strain relationship of the working face in ESTCS. The results of the 3D physical model experiments combined with hybrid statistical methods were effective for predicting dynamic hazards in ESTCS.

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Study of the time–space–strength relation for mining seismicity at Laohutai coal mine and its prediction

Cited by 19 publications

References 0 publications

Experimental and numerical analysis of an industrial RC tower

Experimental and numerical analysis of an industrial RC tower

Experimental Study on the Effect of Advancing Speed and Stoping Time on the Energy Release of Overburden in an Upward Mining Coal Working Face with a Hard Roof

Simulation of Asymmetric Destabilization of Mine-void Rock Masses Using a Large 3D Physical Model

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