Applications of MODFLOW in quantitative analysis coal seam floor water inrush condition

2011 ◽  
Author(s):  
Tian Gan ◽  
Zhao Chunhu
Keyword(s):  
Quantitative Analysis ◽  
Coal Seam ◽  
Water Inrush ◽  
Floor Water Inrush

scholarly journals Failure Characteristics and Confined Permeability of an Inclined Coal Seam Floor in Fluid-Solid Coupling

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Jian Sun ◽  
Lianguo Wang ◽  
Guangming Zhao
Keyword(s):  
Stress Concentration ◽  
Coal Seam ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Water Inrush ◽  
Equivalent Stress ◽  
Confined Aquifer ◽  
Confined Water ◽  
Floor Water Inrush ◽  
Failure Depth

Secondary development of FLAC3D software was carried out based on FISH language, and a 3D fluid-solid coupling numerical calculation model was established for an inclined seam mining above a confined aquifer in Taoyuan Coal Mine. A simulation study was implemented on the mining failure depth of an inclined coal seam floor, conducting height of confined water, and the position of workface floor with easy water inrush during advancement of workface. Results indicated that, during the advancement of the inclined coal seam’s workface, obvious equivalent stress concentration areas existed in the floor strata, and the largest equivalent stress concentration area was located at the low region of workface floor. When the inclined coal seam workface advanced to about 80 m, the depth of floor plastic failure zone reached the maximum at approximately 15.0 m, and the maximum failure depth was located at the low region of the workface floor. Before the inclined workface mining, original confined water conducting existed on the top interface of the confined aquifer. The conducting height of the confined water reached the maximum at about 11.0 m when the workface was pushed forward from an open-off cut at about 80 m. Owing to the barrier effect of the “soft-hard-soft” compound water-resistant strata of the workface floor, pore water pressure and its seepage velocity in the floor strata were unchanged after the workface advanced to about 80 m. After the strata parameters at the workface floor were changed, pore water pressure of the confined water could pass through the lower region of the inclined workface floor strata and break through the barrier of the “soft-hard-soft” compound water-resistant strata of the workface floor and into the mining workface, resulting in the inclined coal seam floor water inrush. Results of this study can provide a basis for predicting, preventing, and governing the inclined coal seam floor water inrush above confined aquifer.

Numerical Analysis for the Influence of Mining Deep Coal Seam on Oversize Normal Fault

2014 ◽  
Vol 1073-1076 ◽  
pp. 2112-2116
Author(s):  
Xin Xian Zhai ◽  
Shi Wei Zhang ◽  
She Jun Ma ◽  
Guang Sen Li
Keyword(s):  
Coal Seam ◽  
Abutment Pressure ◽  
Water Inrush ◽  
Coal Pillar ◽  
Normal Fault ◽  
Mine Safety ◽  
Coal Face ◽  
Safety Production ◽  
Floor Water Inrush ◽  
The Stability

The F2 fault Guo in Tianyu Coal Mine belongs to the oversize normal fault, and mining deep coal seam has an influence on the floor water-inrush. Therefore, study the reasonable width of the fault protected coal pillar is a great significance for the mine safety production. With different advance distances of coal face into the fault hangingwall, the authors, by FLAC numerical calculation, studied the characteristics of plastic zone and stress field in front of the coal face. The results show that influence zone scope of moving abutment pressure is about 70~ 80m. The fault is still in the pressure-relief area when it is in the moving abutment pressure zone. The conclusion is conducive to the stability of F2 fault Guo, to prevent the floor from water-inrush, when the reasonable coal pillar width of the fault is wider than 80m.

scholarly journals Research on Coal Seam Floor Water Inrush Monitoring Based on Perception of IoT Coupled with GIS

Engineering ◽  
2012 ◽  
Vol 04 (08) ◽  
pp. 467-476 ◽  
Author(s):  
Xiangrui Meng ◽  
Junhao Wang ◽  
Zhaoning Gao
Keyword(s):  
Coal Seam ◽  
Water Inrush ◽  
Floor Water Inrush

Risk Evaluation of Water Inrush from Coal Floor Based on BP Neural Network

2015 ◽  
Vol 744-746 ◽  
pp. 1728-1732 ◽  
Author(s):  
Wei Tao Liu ◽  
Shi Liang Liu ◽  
Yan Shuang Sun
Keyword(s):  
Neural Network ◽  
Coal Seam ◽  
Bp Neural Network ◽  
Risk Evaluation ◽  
Evaluation System ◽  
Evaluation Method ◽  
Water Inrush ◽  
Test Collection ◽  
Working Face ◽  
Floor Water Inrush

According to the nonlinear dynamic characteristic of coal seam floor water inrush, coal seam floor water inrush risk evaluation which includes 4 first level indicators,14 level two indexes was built based BP neural network. According to the test collection of engineering data, coal seam floor water inrush risk evaluation system based VB and MATLAB is reliable. Application to a mine coal seam No.2 working face was verified. The results show that, the evaluation method in water inrush is feasible, reasonable.

scholarly journals A New Quantitative Method for Risk Assessment of Coal Floor Water Inrush Based on PSR Theory and Extension Cloud Model

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Bingyou Jiang ◽  
Bo Ren ◽  
Mingqing Su ◽  
Bao Wang ◽  
Xin Li ◽  
...  
Keyword(s):  
Coal Seam ◽  
Cloud Model ◽  
Evaluation Model ◽  
Water Inrush ◽  
Indicator System ◽  
Working Face ◽  
Actual Evaluation ◽  
Evaluation Indicator System ◽  
Floor Water Inrush ◽  
Cloud Theory

In order to scientifically and reasonably assess the risk of water inrush from the coal seam floor, considering the influence of natural environmental factors such as hydrogeology, mining, and human intervention, the PSR model of ecosystem health evaluation was introduced, and the risk evaluation indicator system of water inrush from the coal seam floor was established. In order to solve the randomness and fuzziness of water inrush event evaluation, the evaluation model is constructed based on extension cloud theory and is applied in the 12123 working face of Pan Er coal mine of Huainan Mining Group. The application results show that the evaluation results are basically consistent with the actual situation, which shows that the model can be used in the actual evaluation work and is scientific.

Application of Vulnerability Index Method in Floor Water Inrush Evaluation

2014 ◽  
Vol 614 ◽  
pp. 321-326 ◽  
Author(s):  
Xiao Ming Li ◽  
Qi Mou Zhou ◽  
Xiao Rui Xiang ◽  
Jun Liu
Keyword(s):  
Coal Seam ◽  
Evaluation Method ◽  
Water Inrush ◽  
Vulnerability Index ◽  
Assessment Method ◽  
Coal Industry ◽  
Index Method ◽  
Vulnerability Index Method ◽  
Floor Water Inrush ◽  
The Impact

There are many factors that promote the coal seam floor water bursting, one coal seam floor water inrush evaluation method that can truly reflect being controlled by the impact of multiple factors and having very complex mechanism and process of evolution in the current is very necessary. In this paper, the case of the 9# coal seam in Shanxi Liulin Hongshengjude coal industry Co. Ltd.is taken as an example, analyzing the application of vulnerability index method in coal seam floor water inrush evaluation, a comparison is made on the assessment results obtained from vulnerability index method and the traditional water inrush coefficient assessment method. The results indicate that the assessment result of the vulnerability index method which considers factors comprehensively is truer to the reality and more advantages.

Application of Kriging Method to Evaluation of the Water Inrush Risk

2013 ◽  
Vol 807-809 ◽  
pp. 2294-2298
Author(s):  
Guang Peng Zhang ◽  
Wen Quan Zhang ◽  
Pei Cong Sun ◽  
Kai Zhao ◽  
Zhi Da Liu
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Interpolation Method ◽  
Water Inrush ◽  
Mining Area ◽  
Difficult Problem ◽  
Kriging Interpolation ◽  
Karst Water ◽  
Kriging Interpolation Method ◽  
Floor Water Inrush

The water disaster of floor in coal mine is a difficult problem of production and scientific research. Coal mine workers and scientific-technological workers are very concerned about this problem.The pressure-bearing karst water of 5# limestone poses a threat to production of 8# coal seam. Combining with the method of water inrush coefficient and Kriging interpolation method analyze the possibility of water inrush. The water inrush coefficient contour map has good convexity, verisimilitude and smoothness. Results accord with actual situation and intuitively reflect the 8# coal seam floor water inrush risk .The water inrush coefficient in the actual mining area is not more than 0.1 MPa/m, but in the future and in mining regional the water inrush coefficient could be very big, so we need to take the necessary precautions.

Research on Automatic Detection Technology for Coal Seam Floor Failure Features

2011 ◽  
Vol 467-469 ◽  
pp. 1870-1875 ◽  
Author(s):  
Guang Ming Zhao ◽  
Xiang Rui Meng
Keyword(s):  
Coal Seam ◽  
Water Inrush ◽  
Damage Zone ◽  
Detection Technology ◽  
Floor Failure ◽  
Industry Practice ◽  
Iteration Model ◽  
Forward Calculation ◽  
Mining Coal ◽  
The Impact

By the impact of coal mining, coal floor will produce distortion and damage, and make the damage zone which may result in water inrush from the floor of coal seam. CT technology with DC electricity is used to analyze two-dimensional point source current field by employing the forward calculation, inverse iteration, model correction and other methods. On the basis, inverted resistivity image of the detecting zone is obtained, which can help to determine damage law and damage depth of coal seam floor. And then the possibility of water inrush from the coal floor is analyzed. Industry practice shows that the research results are credible and can play an important guiding role in the controlling of water inrush.

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