Heavy rockbursts due to longwall mining near protective pillars: A case study

Koníček, Petr; Schreiber, J.

doi:10.1016/j.ijmst.2018.08.010

Cited by 39 publications

(18 citation statements)

References 10 publications

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“…At the intersection of the two zones, the stresses in the goaf-side lateral pressure influence zone and the advance mining pressure influence zone overlapped to form the superimposition influence zone. ere was an extremely high-concentrated stress in this zone, which is likely to cause large deformation, collapse, rock burst, coal and gas outburst, and other disasters [30,31].…”

Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Mine Pressure Behavior Characteristics and Control Methods of a Reused Entry that Was Formed by Roof Cutting: A Case Study

Wang

et al. 2020

Shock and Vibration

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Noncoal pillar mining with automatic formation of a roadway is a new coal mining method that is tailored to improve the coal resource recovery rate and reduce the investment in roadway tunneling. Using this proposed method, a reuse entry is formed by roof cutting instead of tunneling. In this paper, the S1201-II working face of the Ningtiaota Coal Mine was used as a case study. The stress distribution of surrounding rock and the roof deformation characteristics of the reused entry during the mining process of the second working face were studied through FLAC3D numerical simulations combined with field measurements. The results indicate that the zone close to the reused entry led to higher stress in advance. If this stress is superimposed with the lateral pressure of the adjacent mined working face, it will be more difficult to maintain the reused entry. In the engineering case study described here, the reused entry created a stress increase zone and a severe deformation zone in the range of 0–80 m in front of the working face, and its range was approximately 37.5% larger than an ordinary entry. The stress peak in the stress increase zone increased by approximately 34.7% over that of an ordinary entry. The maximum amount of deformation within the severe deformation zone increased by 94.4% over that of an ordinary entry. To properly control the surrounding rock stress and deformation of the reused entry, a dynamic pressure bearing support in front of the working face with adaptability to the large roof deformation and high support strength is proposed here. Field application results showed that the final roof deformation with the dynamic pressure bearing support can be satisfactorily controlled within 110∼130 mm. These findings can provide a reference for researchers and field engineering technicians when engaging in the support work of reused entry.

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Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Mine Pressure Behavior Characteristics and Control Methods of a Reused Entry that Was Formed by Roof Cutting: A Case Study

Wang

et al. 2020

Shock and Vibration

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“…Blasting remains the most economical and practical way to break a rock in rock roadways [1,2]. With the expansion of mine design capacity, safe mine production has become increasingly difficult using a single roadway; two, three, or even multiple roadway development and deployment methods have therefore become a necessary choice [3,4]. e increase of mining depth further introduces roadway effects, such as high ground stress, high ground temperature, high permeability pressure, and mining disturbances, and the appearance of rock pressure is particularly complicated [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Influencing Factors of Disturbance Effects of Blasting and Driving of Deep Mine Roadway Groups

Kan

Wang

2021

Shock and Vibration

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The development and application of roadway group layout methods in coal mines have become more common and the mutual disturbance of blasting and driving of roadway groups has also become more prominent at depth. To improve the stability of rock mass surrounding roadways, we performed a systematic study on the factors that influence blasting and driving disturbances of adjacent roadways in deep mine roadway groups. We use the dynamic analysis module in FLAC3D to obtain the influence laws of three factors on the disturbance effects of adjacent roadways, namely, excavation methods, layer position changes of the roadway group, and whether or not bolt support is applied in the first roadway. Blasting strongly influences the surrounding roadway and increased horizontal distance can effectively reduce the disturbance effects of blasting and driving between adjacent roadways compared with increased vertical distance. Bolt support of the first excavated roadway enhances the roadway integrity and better stabilizes the rock structure surrounding the roadway. Industrial tests were carried out on three uphill roadways in the Gubei no. 1 mine (6-2). The monitoring results show that the movement of the roof and floor of the floor uphill return wind roadway is larger than that on the two sides. There is no notable change in the deformation speed of the surrounding rock in the floor return air roadway, but the deformation speed of the uphill conveyor belt roadway changes significantly. The results show that when the blasting excavation of a deep mine roadway group is more than five times the tunnel spacing, the increased horizontal distance effectively reduces the disturbance effects of excavation between adjacent roadways, which is consistent with the simulation results.

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“…Underground coal mines are gradually affected by mine earthquakes with increased coal mining depth [12,13]. In the limited deep space, mine earthquakes may cause a series of other coal mine disasters, such as rock explosion, coal and gas outburst [14], and water penetration [15][16][17][18][19][20]. erefore, the response of deep underground coal mine structure should be analyzed under the seismic load.…”

Section: Introductionmentioning

confidence: 99%

Seismic Response Analysis of Deep Underground Roadways and Coal Pillars under the Influence of the Adjacent Goaf

Cao

Han

2021

Advances in Civil Engineering

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In this work, a numerical study is conducted on the seismic response of deep-buried roadways in coal mines under the influence of goafs, and a 3D numerical model of the seismic response simulation of deep-buried roadways is established using the coupling model of the finite difference method and the distinct element method. This model simulates the seismic response of different coal pillar widths and the seismic conditions of the deep-buried roadways under the influence of the adjacent goafs. The deformation, stress distribution, and plastic area distribution of roadways and coal pillars are systematically studied, and the situations under the static load and the roadways, which are not affected by the goafs, are compared and analyzed. A reasonable width of the coal pillar is proposed on the basis of the stability of the roadway and the coal pillars. In the end, suggestions for the reasonable setting of coal pillars under seismic load are provided.

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Heavy rockbursts due to longwall mining near protective pillars: A case study

Cited by 39 publications

References 10 publications

Mine Pressure Behavior Characteristics and Control Methods of a Reused Entry that Was Formed by Roof Cutting: A Case Study

Mine Pressure Behavior Characteristics and Control Methods of a Reused Entry that Was Formed by Roof Cutting: A Case Study

Influencing Factors of Disturbance Effects of Blasting and Driving of Deep Mine Roadway Groups

Seismic Response Analysis of Deep Underground Roadways and Coal Pillars under the Influence of the Adjacent Goaf

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