Numerical investigation of groundwater outbursts near faults in underground coal mines

Li, Lianchong; Yang, Tianhong; Liang, Zhongmin; Zhu, Wancheng; Tang, Chun’an

doi:10.1016/j.coal.2010.12.006

Cited by 93 publications

(27 citation statements)

References 38 publications

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“…The advancing direction of the working face was parallel to Fault F16; thus, a plane strain model was selected without considering the effects of the advancement of the working face [27,29,35]. Based on detailed geological records of Panel 1031, the direction of inclination of the working face was set as the X-axis, the direction of advancement of the working face was set as the Y-axis, and the vertical direction of the model was set as the Z-axis.…”

Section: A Calculation Modelmentioning

confidence: 99%

Numerical Study on the Mechanism of Water Inrush by Floor Damage and Fault Activation during Longwall Mining

Zhang¹,

Wei²,

Zhang³

et al. 2018

Proceedings of the 9th China-Russia Symposium “Coal in the 21st Century: Mining, Intelligent Equipment and Environment Protecti

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This study evaluated the damage and fracture patterns in mine floors and the fault activation caused by longwall mining, as well as the associated effects on mine water inrush. Numerical simulations were used for this evaluation. The results indicated that higher water pressures in confined aquifers and the existence of faults can increase the probability of water inrush in deep coal seams. A wider coal pillar at the fault can help prevent water inrush events. Numerical simulations were used to demonstrate the complete process of fracture development in the floor, fault activation, and formation of water inrush channels during longwall mining. This study improved the understanding of the mechanisms of water inrush through the fault zone. The results of this study are important to the design of water-resistant coal pillars in active coal seams above confined aquifers with faults Keywords-hydro-mechanical coupling, floor damage, fault activation, mechanism of water inrushThe 9th Russian-Chinese Symposium. Coal in the 21st Century: Mining, Intelligent Equipment and Environmental Protection

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Section: A Calculation Modelmentioning

confidence: 99%

Numerical Study on the Mechanism of Water Inrush by Floor Damage and Fault Activation during Longwall Mining

Zhang¹,

Wei²,

Zhang³

et al. 2018

Proceedings of the 9th China-Russia Symposium “Coal in the 21st Century: Mining, Intelligent Equipment and Environment Protecti

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show abstract

“…These accidents have resulted in tremendous losses to workforce safety and state economy [1,2]. Currently, mine water inrush is affected by a range of factors, including hydraulic pressure, water yield of the aquifer, effective thickness, thickness of resistance rock strata, as well as geological structure (fault and collapse columns) [3][4][5][6][7][8]. As a major protective layer below the aquifer, aquiclude plays an important role in controlling roof water inrush, due to its waterproof function.…”

Section: Introductionmentioning

confidence: 99%

An Index of Aquiclude Destabilization for Mining-Induced Roof Water Inrush Forecasting: A Case Study

Fan

Zhang

et al. 2019

Water

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Aquiclude plays a critical role in the occurrence of mining-induced roof water inrush in underground coal mines. This paper proposes an assessment index for the evaluation of aquiclude stability and a threshold value of water inrush from the roof, based on a case study of roof water inrush accidents in Cuimu coal mine, China. The relation between roof water inrush and water level variation in the aquifer, and the characteristics of aquiclude deformation, were studied in this assessment. Using the developed assessment criteria, the likelihood of roof water inrush was categorized into different risk levels, which were followed by a proposal for roof water inrush control measures. The main findings of this study are: a) in Cuimu coal mine, the waterbody in the bed separation between the upper aquifer and the aquiclude directly causes the inrush, and inrush occurs after the water level declines in the aquifer; b) tension-induced horizontal strains of aquiclude can be regarded as the index to evaluate the stability of aquiclude affected by underground coal mining—roof water inrush occurs when the maximum horizontal strain reaches a threshold of 10mm/m—c) based on the critical mining height for aquiclude instability, and the different thicknesses of barrier layers, high-risk zones are identified and inrush controls are proposed.

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“…In this paper, the Xiaowanggou iron mine was selected as an engineering project for an in-depth study. The rock mass caving mechanism and surface subsidence characteristics during the sublevel caving mining were comprehensively studied using an in situ geological investigation and numerical analysis method (the FEM-based numerical software RFPA 2D [28][29][30][31]). The overall understanding of the process from the crack propagation, stress evolution, and damage development to the rock caving and surface subsidence is obtained.…”

Section: Introductionmentioning

confidence: 99%

Study on the Rock Mass Caving and Surface Subsidence Mechanism Based on an In Situ Geological Investigation and Numerical Analysis

Ren

Zhang

Cao

et al. 2018

Mathematical Problems in Engineering

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To deeply understand the mechanism of the rock mass caving and associated surface subsidence during sublevel caving mining, the Xiaowanggou iron mine was selected as an engineering project case study. The study area was analyzed by means of an in situ geological investigation and numerical simulation. First, a borehole television (BHTV) system and a GPS monitoring system were used to monitor the caving process of the roof rock mass and the development of the surface subsidence; the monitoring time was thirteen months. Then, a numerical simulation was used to analyze the damage evolution of the rock mass. Research shows the following: (1) in situ geological monitoring results indicate that the caving process of the roof rock mass presents intermittent characteristics, where slow caving and sudden caving are conducted alternatively and the arched-caving trend is more pronounced with continuous mining. The surface subsidence, horizontal displacement, and horizontal deformation of the hanging wall are higher than that of the footwall, and the subsidence center gradually deflects to the hanging wall in the late stage of the +45m sublevel mining. (2) Numerical simulation results indicate that the extension and penetration of the shear and tensile cracks along the joints and intact rock bridges are the main factors causing the rock mass caving and the existence of the stress arch and its evolution process is the fundamental reason for the intermittent caving of the rock mass. The rapid development of damage to the hanging wall (the damage angle reduced) is the main cause of the deflection of the subsidence center affected by joints and the mining size. (3) In the future of mining, large-scale subsidence will occur on the surface of the hanging wall.

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Numerical investigation of groundwater outbursts near faults in underground coal mines

Cited by 93 publications

References 38 publications

Numerical Study on the Mechanism of Water Inrush by Floor Damage and Fault Activation during Longwall Mining

Numerical Study on the Mechanism of Water Inrush by Floor Damage and Fault Activation during Longwall Mining

An Index of Aquiclude Destabilization for Mining-Induced Roof Water Inrush Forecasting: A Case Study

Study on the Rock Mass Caving and Surface Subsidence Mechanism Based on an In Situ Geological Investigation and Numerical Analysis

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