Study on Practice of Rockburst Accident Prevention in Multi-seam Mining Controlled by Large Fault and Hard Roof

Shi, Xianfeng; Zhang, Xingkai; Jiang, Fuxing; Wei, Jie

doi:10.1007/s10706-020-01473-5

Cited by 8 publications

(4 citation statements)

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“…Eventually, the overburden could not be formed into an “arch” structure. After mining through the fault, initially, due to the fault crushing zone of the absorption, the decompression effect is more significant, so that the working face above the rock layer did not appear a wide range of broken, but with the increase in the distance of the advancement of the direct roof of the layer, the collapsed phenomenon is more obvious, and in the vertical direction continues to develop, the fault on the hanging wall of the overlying rock ultimately formed an “arch” structure, the hanging wall high-level rock layer near the fault plane forms an “inverted triangle” structure and continues to rotate to the gob area 37 , 38 .…”

Section: Resultsmentioning

confidence: 99%

Research on dynamic response characteristics of normal fault footwall working face and rock burst prevention technology under the influence of the gob area

Tai,

Li,

et al. 2023

Sci Rep

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To study the effect of mining dynamic response characteristics on the footwall working face of the normal fault under the influence of the gob area, theoretical research, indoor experiment, and numerical simulation are adopted to analyze the stress manifestation characteristics, overburden movement, and energy evolution characteristics during the process of mining. The results show that: (1) In the process of mining toward the fault, the working face shows the change characteristics of “stable-activation mutation-final stability”. At 20 m from the fault, the arch structure of the working face was damaged, fissures appeared near the high fault fracture zone, and the displacement of the overburden rock increased significantly; (2) the maximum value was reached at 4–8 m from the coal wall, and the superposition of tectonic stress and mining stress led to the concentration of the stress and energy accumulating on the top plate near the fault, and the data close to the gob area were even larger; (3) If the plastic damage zone of the high-level rock layer on the hanging wall and footwall of the fault appears to have a wide range of penetration, and the area formed between the shear displacement curve of the fault plane and the X-axis appears to have a significant enhancement, it is considered that the fault has been activated; (4) The size of the coal pillar of the fault is determined to be 40 m, and combined with the pressure unloading technique of the variable-diameter drilling hole, the validation is carried out through the micro-vibration monitoring, and the results of which can be used as a reference for the safety of the working face under similar conditions.

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Section: Resultsmentioning

confidence: 99%

Research on dynamic response characteristics of normal fault footwall working face and rock burst prevention technology under the influence of the gob area

Tai,

Li,

et al. 2023

Sci Rep

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“…After the coal seam is excavated, the coal mass in front of the coalface generates a high vertical stress under the influence of stress transfer because of the incomplete caving of the ultrathick conglomerate, and the coal seam expands under a high stress and results in plastic deformation [35][36][37]. Affected by the coupling of ultrathick conglomerate activity, excavation disturbance, and fault activation, burst will occur on the coalface when the load bearing limit of the coal mass is exceeded.…”

Section: Formation Mechanism Of Floor Slip Burstmentioning

confidence: 99%

Study on the Formation Mechanism of Rock Burst Caused by Seam Floor Slip under an Ultrathick Conglomerate

Feng

Wang

et al. 2021

Mathematical Problems in Engineering

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A rock burst accident occurred on coalface 13230 of the Gengcun Coal Mine in Henan Province. Through a field investigation, theoretical analysis, and microseismic monitoring, we studied how the rock burst, which was caused by overall seam floor slip and instability, occurring under an ultrathick conglomerate. Because the overlying ultrathick conglomerate in the mined-out zone close to coalface 13230 had been inadequately mined, the leading section of the coalface was under a high level of stress. Combined with the tectonic stresses from the F16 faultage and the soft floor structure, these factors caused the floor of this coalface to trigger the overall slip-type rock burst. In this paper, an estimation model of the ultimate bearing capacity of a seam floor under an ultrathick conglomerate and the advancing abutment pressure on the coalface is presented. This model is used to show that the ultimate bearing capacity of the seam floor on coalface 13230 is 26.3 MPa, and the abutment pressure is far more than the floor bearing capacity. We also present pressure relief and reinforced supporting measures, which can effectively prevent floor slip-type rock bursts from occurring. The results of this study provide a reference for the prevention and control of floor slip-type rock bursts in coal mining under an ultrathick conglomerate.

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“…As the cornerstone of China's current energy, coal resources maintain the leading position of energy. With the continuous increase in mining depth and intensity of coal resources, the stress level of stopes keep getting higher, so rockburst disasters in coal mines are aggravating daily (Shi et al 2020; Dai et al 2021; Li et al 2021), and have become one of the most important disasters affecting the safe production of coal mines, which seriously threatens the safety of underground personnel and equipment. For example, the "10.20" rockburst event of the Longyun coal mine in October 2018 and the "2.22" rockburst event of the Longgu coal mine in February 2020 caused 21 and 4 deaths respectively, which greatly affected the normal production of mines and the safety of workers' lives and property.…”

Section: Introductionmentioning

confidence: 99%

Continuous three-dimensional stress monitoring in roof of coal mines for investigating the rockburst control effect with hydraulic fracturing

et al. 2022

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The occurrence of rockburst in coal mines is closely related to the three-dimensional stress in coal and rock mass. Through hydraulic fracturing measurements in roof, the three-dimensional stress in roof before and after hydraulic fracturing as well as during working face advancing was monitored, and the effect of hydraulic fracturing in roof on controlling rockburst was studied. The test results show that (1) after hydraulic fracturing, the three principal stresses in roof decreased remarkably, whose maximum reduction was about 20%, while the elastic strain energy in roof decreased by about 31% as well; (2) as the working face advanced, the three principal stresses in roof in front of the working face would increase continuously until reaching peaks and induce the strata fracture, and the variation of the elastic strain energy in roof was basically consistent with that of the magnitude of three-dimensional stress; (3) with hydraulic fracturing, the position of the peak stress moved from 11 m to 21 m in front of the working face, the peaks of the three principal stresses decreased, whose maximum reduction was about 32%, and the peak of the elastic strain energy in roof also signi cantly decreased by about 51%. The eld investigation shows that hydraulic fracturing in roof can release the stress and elastic strain energy in coal and rock mass instantaneously, and will reduce the risk of rockburst; hydraulic fracturing in roof can be an effective pre-destressing method to reduce the stress and energy concentration in coal and rock mass during mining, and will prevent the risk of rockburst.

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Study on Practice of Rockburst Accident Prevention in Multi-seam Mining Controlled by Large Fault and Hard Roof

Cited by 8 publications

References 0 publications

Research on dynamic response characteristics of normal fault footwall working face and rock burst prevention technology under the influence of the gob area

Research on dynamic response characteristics of normal fault footwall working face and rock burst prevention technology under the influence of the gob area

Study on the Formation Mechanism of Rock Burst Caused by Seam Floor Slip under an Ultrathick Conglomerate

Continuous three-dimensional stress monitoring in roof of coal mines for investigating the rockburst control effect with hydraulic fracturing

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