scholarly journals Study of Rock Burst Risk Evolution in Front of Deep Longwall Panel Based on Passive Seismic Velocity Tomography

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Kunyou Zhou ◽  
Linming Dou ◽  
Siyuan Gong ◽  
Jiazhuo Li ◽  
Jinkui Zhang ◽  
...  
Keyword(s):  
Rock Burst ◽  
Seismic Velocity ◽  
Pressure Relief ◽  
Rock Burst Risk ◽  
Longwall Panel ◽  
Passive Seismic ◽  
Passive Seismic Velocity Tomography ◽  
Seismic Velocity Tomography ◽  
Risk Zones ◽  
Velocity Tomography

Monitoring and early-warning are critical for the prevention and controlling of rock burst in deep coal mining. In this study, rock burst risk assessment criterion was built based on the correlativity between seismic velocity and stress state in coal and rock body. Passive seismic velocity tomography using mining-induced seismic waves was conducted regularly and continuously. The evolution of rock burst risk and range in front of a deep longwall panel with folds and adjoining goaf was determined. The influence of pressure-relief measures on rock burst risk was analyzed. The study results indicate that burst risk level and range during panel retreating increase first and then decrease, the peak is reached when it is located at 1# syncline shaft area. When approaching the crossheading, high burst risk zones distribute along the crossheading and further intersect with those in 1# syncline shaft area. Burst risk zones in the inclination of panel show distinct zoning features. Tomography results are in good agreement with the drilling bit result, rock burst occurrence, microseismic activity, and working resistance of hydraulic supports. Pressure-relief measures and mining layout have a distinct influence on burst risk of longwall panel. For prevention and controlling of rock burst risk in deep coal mining, pressure-relief measures should be optimized based on passive tomography results.

scholarly journals Passive seismic velocity tomography and geostatistical simulation on longwall mining panel / Tomografia pasywna pola prędkości i symulacje geostatystyczne w obrębie pola ścianowego

2012 ◽  
Vol 57 (1) ◽  
pp. 139-155 ◽  
Author(s):  
Navid Hosseini ◽  
Kazem Oraee ◽  
Kourosh Shahriar ◽  
Kamran Goshtasbi
Keyword(s):  
Wave Velocity ◽  
Seismic Velocity ◽  
Stress Redistribution ◽  
Longwall Face ◽  
Geostatistical Simulation ◽  
Sequential Gaussian Simulation ◽  
Passive Seismic ◽  
Passive Seismic Velocity Tomography ◽  
Seismic Velocity Tomography ◽  
Velocity Tomography

Generally, the accurate determination of the stress in surrounding rock mass of underground mining area has an important role in stability and ground control. In this paper stress redistribution around the longwall face has been studied using passive seismic velocity tomography based on Simultaneous Iterative Reconstructive Technique (SIRT) and Sequential Gaussian Simulation (SGS). The mining-induced microseismic events are used as a passive source. Since such sources are used, the ray coverage is insufficient and in order to resolve this deficiency, the wave velocity is estimated in a denser network and by the SGS method. Consequently the three-dimensional images of wave velocity are created and sliced into the coal seam. To analyze the variations of stress around the panel during the study period, these images are interpreted. Results show that the state of stress redistribution around the longwall panel can be deduced from these velocity images. In addition, movements of the stressed zones, including front and side abutments and the goaf area, along the longwall face are evident. The applied approach illustrated in this paper can be used as a useful method to monitoring the stress changes around the longwall face continuously. This can have significant safety implications and contribute to improvements in operational productivity

Quantitative analysis of seismic velocity tomography in rock burst hazard assessment

2014 ◽  
Vol 75 (3) ◽  
pp. 2453-2465 ◽  
Author(s):  
Wu Cai ◽  
Linming Dou ◽  
Siyuan Gong ◽  
Zhenlei Li ◽  
Shasha Yuan
Keyword(s):  
Quantitative Analysis ◽  
Rock Burst ◽  
Hazard Assessment ◽  
Seismic Velocity ◽  
Burst Hazard ◽  
Seismic Velocity Tomography ◽  
Velocity Tomography

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.

scholarly journals Three-dimensional seismic velocity tomography of Montserrat from the SEA-CALIPSO offshore/onshore experiment

2010 ◽  
Vol 37 (19) ◽  
pp. n/a-n/a ◽  
Author(s):  
E. Shalev ◽  
C. L. Kenedi ◽  
P. Malin ◽  
V. Voight ◽  
V. Miller ◽  
...  
Keyword(s):  
Seismic Velocity ◽  
Three Dimensional ◽  
Seismic Velocity Tomography ◽  
Velocity Tomography
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