Overlying strata movement and stress evolution laws triggered by fault structures in backfilling longwall face with deep depth

Wang, Fangtian; Ma, Qi; Chen, Jianhang; Feng, Guorui

doi:10.1080/19475705.2020.1763482

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…UDEC is a numerical analysis program based on discontinuous discrete element method, which can be used to calculate the movement, deformation, and failure of surrounding rock during SDCS backfilling mining process [24,25]. It can well reflect the variation characteristics of stress, displacement, and failure field, and the simulation results are comprehensive, intuitive, and easy to analyze.…”

Section: Numerical Simulation Experimentsmentioning

confidence: 99%

Surrounding Rock Movement of Steeply Dipping Coal Seam Using Backfill Mining

Guo

et al. 2021

Shock and Vibration

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The movement of the overlying strata in steeply dipping coal seams is complex, and the deformation of roof rock beam is obvious. In general, the backfill mining method can improve the stability of the surrounding rock effectively. In this study, the 645 working face of the tested mine is used as a prototype to establish the mechanical model of the inclined roof beam using the sloping flexible shield support backfilling method in a steeply dipping coal seam, and the deflection equation is derived to obtain the roof damage structure and the maximum deflection position of the roof beam. Finally, numerical simulation and physical similarity simulation experiments are carried out to study the stability of the surrounding rock structure under backfilling mining in steeply dipping coal seams. The results show the following: (1) With the support of the gangue filling body, the inclined roof beam has smaller roof subsidence, and the maximum deflection position moves to the upper part of working face. (2) With the increase of the stope height, the stress and displacement field of the surrounding rock using the backfilling method show an asymmetrical distribution, the movement, deformation, and failure increase slowly, and the increase of the strain is relatively stable. Compared with the caving method, the range and degree of the surrounding rock disturbed by the mining stress are lower. The results of numerical simulation and physical similarity simulation experiment are generally consistent with the theoretically derived results. Overall, this study can provide theoretical basis for the safe and efficient production of steeply dipping coal seams.

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Section: Numerical Simulation Experimentsmentioning

confidence: 99%

Surrounding Rock Movement of Steeply Dipping Coal Seam Using Backfill Mining

Guo

et al. 2021

Shock and Vibration

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“…This process can be divided into three stages of development: discontinuous jumping, continuous transverse extension, and lateral expansion. Wang et al (2020) studied the overburden movement and stope stress evolution laws in the process of longwall mining through faults via Universal Distinct Element Code (UDEC) numerical simulation, theoretical analysis, and field measurement. These studies revealed the development characteristics and evolution process of overburden fractures in coal seam mining in gully areas.…”

Section: Introductionmentioning

confidence: 99%

Overburden stress evolution characteristics and prediction of disasters with across-gully mining

Wang

Jiang²,

Jiao³

et al. 2023

Front. Earth Sci.

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The coal water co-mining of shallow coal seams in the loess gully area of Northern Shaanxi is affected by the coupling effect of overburden rock structure and topography. The development characteristics of mining fracture are complex and can induce mining and environmental disasters. To predict the disaster formation, taking the 113101 working face of the Kunyuan Coal Mine as the engineering background, numerical simulation, physical similarity simulation experiment, and theoretical analysis methods were used to analyze the mining gully of a shallow coal seam in a loess gully area. Based on the dynamic evolution characteristics of stress at different locations, the formation positions, dynamic development, and evolution processes of various fractures were studied; disaster-causing mechanisms were revealed and comprehensive methods were proposed. The results showed that in across-gully mining, the maximum horizontal compressive stress at the bottom of Gully No. 2 was approximately 20.00 MPa, the maximum horizontal tensile stress of the reverse slope section was approximately 1.50 MPa, the width of the F5 fracture of Gully No. 2 was 46.00 cm, and the elevation difference was up to 52.00 cm. The working face across-gully mining formed tensile fractures in most areas, collapsed fractures at the gully bottom, and extruded fractures in the reverse slope section. The fracture at the gully bottom could easily induce water–sand inrush and roof caving and supports crushing. The slope fracture could also induce a gully-induced landslide. According to the mechanisms and distribution areas of fracture disasters, the disaster areas were divided into water–sand inrush areas at the gully bottom, roof caving and supports crushing areas at the gully bottom and at the base of the slope section, and landslide areas at the upper part of the slope section and reverse slope section. Appropriate prevention and control measures were proposed, such as the upstream interception of surface water, slope reinforcement in the middle and upper part of the downhill section, artificial precracking of the roof in the middle and upper part of the downhill section, and grouting reinforcement at the gully bottom and slope toe of the downhill section. These measures were proven to effectively guarantee the safe and efficient mining efficiency of the working face.

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“…As shown in Fig. 1, it was an effective way to reduce surface subsidence, prevent underground dynamic disasters, and protect the ecological environment [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Overburden Strata Movement Mechanism and its Key Control Technologies for Intelligent Backfilling Mining in Deep Coal Seams

Wang

Ren³

et al. 2022

Preprint

Self Cite

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Coordinated development of safety and efficient mining and ecological environment protection in deep coal seams was an important theme of current coal green mining. Based on the geological production conditions in the deep coal seam of Yineng Coal Mine as the engineering background, the intelligent upgrading of backfilling mining equipment has been carried out in field and set the remote-control center in the roadway to realize intelligent backfilling mining; The FLAC3D software was used to simulate the coordinated bearing characteristics of the “backfilling body and the coal pillar”, and the coal pillar width in the reasonable section of the panel was determined to be 30 m. The coordinated load-bearing structure can realize overburden strata stability control. Comparing and simulating the coal energy distribution law with different backfilling ratios, on-site micro-seismic monitoring shows that super-high-water backfilling mining can effectively reduce the degree of coal seam energy accumulation, effectively prevent the occurrence of shock dynamic disasters in deep coal seams, and reveal the mechanism of backfilling mining to prevent rock bursts; In order to further improve the control effect of overburden strata movement in backfilling mining, intelligent mining and backfilling coordinated overburden strata control technologies such as secondary backfilling, and gangue pumping and mining without coal pillars, ‘backfilling body-support-coal body’ coordinated bearing have been proposed; The intelligent monitoring and pre-warning of the backfilling face, the intelligent monitoring and control of the surrounding rock deformation of the roadway and the evaluation strategy of the backfilling effect have been constructed, and the intelligent monitoring and pre-warning control technology system of deep coal seam backfilling and mining has been formed. The research results provide a demonstration for the realization of intelligent and green mining of deep coal seams.

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Overlying strata movement and stress evolution laws triggered by fault structures in backfilling longwall face with deep depth

Cited by 13 publications

References 13 publications

Surrounding Rock Movement of Steeply Dipping Coal Seam Using Backfill Mining

Surrounding Rock Movement of Steeply Dipping Coal Seam Using Backfill Mining

Overburden stress evolution characteristics and prediction of disasters with across-gully mining

Overburden Strata Movement Mechanism and its Key Control Technologies for Intelligent Backfilling Mining in Deep Coal Seams

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