Lessons Learnt from Measurements of Vertical Pressure at a Top Coal Mining Face at Datong Tashan Mines, China

Xie, Jing; Gao, Mingzhong; Zhang, Ru; Li, Shengwei; Tan, Qiang; Qiu, Zhiqiang

doi:10.1007/s00603-015-0856-1

Cited by 28 publications

(5 citation statements)

References 9 publications

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“…10 Mine by combining similar and numerical simulations and conducted a numerical simulation of the gas migration law in the fractured zone. Gao [17] studied the abutment pressure, complexity and connectivity evolution trend of mining-induced fracture networks under high pressure relief conditions. According to the evolution speeds of the mining fractures and the abutment pressure in the mining face, the evolution laws of fractures and the relationship between connectivity and abutment pressure under the top coal caving condition were preliminarily studied [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Fracture Evolution Characteristics and Deformation Laws of Overlying Strata during the Initial Period of Longwall Mining: Case Study

Sun

et al. 2023

Sustainability

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Coal mining causes overlying rocks to collapse and be destroyed. Overburdened crevasses provide a channel for gas discharge, which is a serious safety hazard. To study the evolution characteristics and migration pattern of overburdened fissures during the initial mining period, the 24207 working face of the Shaquan mine was used as a research object. Through similar physical simulation tests, a mechanical model of the mining structure during the initial mining period was constructed to explore the factors influencing the movement pattern of the overburden strata during the initial mining period. The research results show that the evolution of mining-induced fractures in the overburdened strata in the initial mining period mainly experience the slow and rapid rising stages of the fracture dimension, while the stable mining period is in the stable development stage of the fracture dimension. The research results will help supplement and improve the theory of gas disaster prevention and comprehensive resource utilization in the initial mining stage under the mining conditions of high gas and low permeability coal seam group, achieve the goal of “coal and gas co-mining”, and ensure the safe and efficient production of mines.

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Section: Introductionmentioning

confidence: 99%

Fracture Evolution Characteristics and Deformation Laws of Overlying Strata during the Initial Period of Longwall Mining: Case Study

Sun

et al. 2023

Sustainability

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“…Measures which focused on these two factors were applied, such as excavating the roadway in the rocks with high strength [14] or using the high-strength support to control roadway deformation [15]. However, roadway failure that still emerges as the high stress is ignored [16]. The stress transfer technology, later also referred to as depressurization, was invented to reduce the impact of high stress [17].…”

Section: Introductionmentioning

confidence: 99%

Impact of Depressurizing Boreholes on Energy Dissipation in Deep Roadway

Wang

et al. 2022

Geofluids

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Depressurizing borehole drilling is an effective approach to control the large deformation of deep roadway. It can transfer the high stress in the proximity of the roadway into the deep stable rock masses. However, it should be noted that the borehole drilling will inevitably cause the secondary damage to roadway. To determine the parameters of depressurizing boreholes, the degree of the secondary damage must be evaluated properly. Given that the rock mass failure is an unstable phenomenon driven by energy, it is of great use to reveal the disturbing impact of depressurizing boreholes on the roadway stability from the angle of energy dissipation. This is much more consistent with the failure nature of rock mass. Hence, an integrated method of laboratory test, numerical simulation, and theoretical analysis was used to study the disturbing effect of depressurizing boreholes on roadway energy dissipation. The equations of elastic energy and dissipated energy of rock cell grid were derived based on the energy principle and finite-difference algorithm, which was implemented into FLAC3D software by the FISH language. The numerical stress-strain and dissipated energy-strain curves of rock samples were verified by experimentally obtained data, and the whole deformation path from roadway excavation to instability was back-analyzed by the dissipated energy evolution. Based upon the energy model, the ratio of borehole diameter D to row spacing R ( D / R ) was selected as the variable to analyze the influence of borehole parameters on the depressurizing effect. The varying D / R leads to three depressurizing states: insufficient depressurization, sufficient depressurization, and overdepressurization. Increasing D / R will make the roadway transfer from insufficient depressurization to sufficient depressurization and finally to overdepressurization. The sufficient depressurizing state could be realized by adjusting the borehole D / R value, which is of great use to the roadway control. The D / R values of 1 : 6 to 1 : 2 were proposed for the test roadway, and D / R = 1 : 6 was applied in the field test, which achieved a well roadway control effect.

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“…By using a numerical simulation, the mining‐induced stress field in fully mechanized caving of coal seams with different thicknesses was studied and main characteristics of stress evolution and danger zones were expounded . The range of influence and evolution of vertical stress were obtained through field measurement of vertical stress in the top‐coal in Tashan Coal Mine, Shanxi Province . In addition, numerical simulation of the principal stress field in top‐coal in fully mechanized caving faces adjacent to the gob was conducted and concentration and rotation of the principal stress axis during stoping were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Evolution of mining‐induced stress in fully mechanized top‐coal caving under high horizontal stress

Huo

Song

Sun

et al. 2020

Energy Science & Engineering

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In fully mechanized top-coal caving (FMTC), the effects of coal caving are closely related to the degree of damage to the top-coal which is determined by the stress state therein. Therefore, research into the evolution of mining-induced stress field is key to understanding failure mechanisms of top-coal. By taking the 12 309 FMTC face in Wangjialing Coal Mine (China) as the engineering background and using field measurement and numerical simulation, we studied the evolution of the principal stress field in FMTC under high horizontal stress. The research results demonstrated that in situ stress in Wangjialing Coal Mine was a high horizontal stress and lateral pressure coefficients in the north-south and east-west directions were 1.52 and 0.45, respectively. Under the influence of mining, principal stresses were concentrated in front of the coal wall, with concentration factors of 2.26, 2.24, and 2.85, respectively. The minimum principal stress in unconstrained sides of the top-coal in the roof-control zone was tensile. The directions of intermediate and minimum principal stresses in the top-coal were more sensitive to the influence of mining compared to the maximum principal stress. During rotation of the principal stress direction in topcoal, the location (19 m in front of the coal wall) where the maximum and intermediate principal stresses were equal and the location of the coal wall are key positions.

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Lessons Learnt from Measurements of Vertical Pressure at a Top Coal Mining Face at Datong Tashan Mines, China

Cited by 28 publications

References 9 publications

Fracture Evolution Characteristics and Deformation Laws of Overlying Strata during the Initial Period of Longwall Mining: Case Study

Fracture Evolution Characteristics and Deformation Laws of Overlying Strata during the Initial Period of Longwall Mining: Case Study

Impact of Depressurizing Boreholes on Energy Dissipation in Deep Roadway

Evolution of mining‐induced stress in fully mechanized top‐coal caving under high horizontal stress

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