Water-Inrush Mechanism while Fault Zone Secondary Activated in Mining

2012 ◽  
Vol 524-527 ◽  
pp. 799-802
Author(s):  
Shi Guo Sun ◽  
Shao Jie Feng ◽  
Jia Hao Lei
Keyword(s):  
Fault Zone ◽  
Fracture Zone ◽  
Rock Fracture ◽  
Water Inrush ◽  
Mining Area ◽  
Water Conductivity ◽  
Sublevel Caving ◽  
Discontinuous Deformation ◽  
Height Increase ◽  
The Impact

As many different size faults in the fully-mechanized sublevel caving mining area overlying rock, undermine the continuity of rock deformation, and the occurrence of different conditions, the impact properties vary widely. This paper studies the impact of faults on the water inrush with specific examples of project, obtained the discontinuous deformation on both sides of fault zone induce the fault zone secondary activate and result in it’s water transmitting ability dramatic increase; with the mining geometry increases, the water flowing-fracture zone height increase and lead to the water conductivity channel of faults connect with rock fracture zone, so as to constitute water inrush channel and likely to cause water inrush accident, so to explore the influence of fault for underground work safety has important theoretical significance and application value.

Sleeve Valve Pipe and Steel Pipe Micropile Fractured Tensile Reinforcement in Combination with the Application of a Mined-Out Area

2014 ◽  
Vol 580-583 ◽  
pp. 887-892
Author(s):  
Sheng Li Tang ◽  
Liang Yang ◽  
Li Hai Sun ◽  
Xiong Wei Li
Keyword(s):  
Fracture Zone ◽  
Rock Fracture ◽  
Early Years ◽  
Steel Pipe ◽  
Normal Operation ◽  
Security Risk ◽  
Reinforcement Scheme ◽  
Effective Governance ◽  
Technical Requirements ◽  
Discontinuous Deformation

Due to the early years of mining makes Gob fracture zone, the deformation of rock fracture zone, and gradually developed through. Located in the mined-out area causing tension within fractured zone of discontinuous deformation region arsenal varying degrees of ground and walls to crack, great security risk to the normal operation of the arsenal caused. Project uses Sleeve Valve Pipe and Steel Pipe Micropile reinforcement scheme. This paper describes the details of the reinforcement mechanism, the construction process, technical requirements and quality assurance measures. Practice has proved that the joint reinforcement program can continue to crack the wall of effective governance to ensure the safe operation of the security arsenal.

scholarly journals Predicting the Water-Conducting Fracture Zone (WCFZ) Height Using an MPGA-SVR Approach

2020 ◽  
Vol 12 (5) ◽  
pp. 1809
Author(s):  
Changfang Guo ◽  
Zhen Yang ◽  
Shen Li ◽  
Jinfu Lou
Keyword(s):  
Genetic Algorithm ◽  
Fracture Zone ◽  
Mine Water ◽  
Mean Squared Error ◽  
Water Inrush ◽  
Correlation Coefficients ◽  
Mining Area ◽  
Support Vector ◽  
Accuracy And Stability ◽  
Overburden Strata

Mine water that inrushes from coal-roof strata has always posed a substantial threat to mining activities every year. Therefore, an accurate prediction of the water-conducting fracture zone (WCFZ) height in the mining overburden strata is of great significance for the prevention and control of mine water accidents. The support vector regression (SVR) is proposed to predict the height of the WCFZ based on the mining depth, hard rock proportional coefficient, mining thickness and length of the working face. Simultaneously, the multi-population genetic algorithm (MPGA) is employed to search for the optimal SVR parameters. The MPGA-SVR model is trained and tested with a total of 69 collected data samples, and it is also applied to a field test. The accuracy and stability of the model were measured by the mean squared error and correlation coefficients. The obtained results show that the MPGA-SVR model achieves a higher accuracy and stability than the traditional empirical formula and genetic algorithm (GA)-SVR model. In terms of the process for optimizing the SVR parameters, the MPGA can find the optimal parameters more quickly and accurately, and it can effectively overcome the problem of premature and slow convergence of the genetic algorithm (GA). The proposed model improves the prediction accuracy and stability, which will help to avoid accidents caused by the inrush of water inrush in mining overburden strata and protect the ecological environment of the mining area.

Change Properties of Water Conductivity Height in Coal Roof Induced by Mining in Extra Thick Coal Seams under Influence of Complex Fissures Zone

2012 ◽  
Vol 446-449 ◽  
pp. 59-63
Author(s):  
Shi Guo Sun ◽  
Guo Hong Li ◽  
Jing Xin Wang ◽  
Hong Ying Zhao ◽  
Shao Jie Feng
Keyword(s):  
Underground Mining ◽  
Water Inrush ◽  
Technical Problem ◽  
Mining Area ◽  
Water Conductivity ◽  
Deformation And Failure ◽  
Mining Areas ◽  
Mining Safety ◽  
Strata Deformation ◽  
Overlying Strata

It’s a technical problem of underground mining safety to determine the water conductivity height in coal roof induced by mining under the condition of fully mechanized caving. With a number of mining engineering cases, we studied complex fault zone overlying rock mass damage characteristics under the compound effect of many mining area. The results show that overlying strata deformation and failure is the results of accumulation in mining of each mining area. Therefore, whether the overlying strata water inrush in mining process will happen or not, needs to take account of water in overlying strata in old mining area. Based on the change characteristics of water conductivity height induced by mining in seven mining areas, we built regression forecasting model, and achieved the prediction of water conductivity height induced by mining in lower coal seam, so as to provide a basis for decision-making for the safety of follow-up exploration.

Evolution of delayed water inrush in fault fracture zone considering time effect

2021 ◽  
Vol 14 (11) ◽  
Author(s):  
Jiwen Bai ◽  
Shaolong Duan ◽  
Rentai Liu ◽  
Lin Xin ◽  
Jiawei Tian ◽  
...  
Keyword(s):  
Fracture Zone ◽  
Water Inrush ◽  
Time Effect ◽  
Fault Fracture Zone

scholarly journals Impact of Industrial Pollution on Radial Growth of Conifers in a Former Mining Area in the Eastern Carpathians (Northern Romania)

Forests ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 640
Author(s):  
Cristian Gheorghe Sidor ◽  
Radu Vlad ◽  
Ionel Popa ◽  
Anca Semeniuc ◽  
Ecaterina Apostol ◽  
...  
Keyword(s):  
Air Pollution ◽  
Industrial Pollution ◽  
Radial Growth ◽  
Abies Alba ◽  
Mining Operation ◽  
Mining Area ◽  
Silver Fir ◽  
Local Pollution ◽  
Eastern Carpathians ◽  
The Impact

The research aims to evaluate the impact of local industrial pollution on radial growth in affected Norway spruce (Picea abies (L.) Karst.) and silver fir (Abies alba Mill.) stands in the Tarnița study area in Suceava. For northeastern Romania, the Tarnița mining operation constituted a hotspot of industrial pollution. The primary processing of non-ferrous ores containing heavy metals in the form of complex sulfides was the main cause of pollution in the Tarnița region from 1968 to 1990. Air pollution of Tarnița induced substantial tree growth reduction from 1978 to 1990, causing a decline in tree health and vitality. Growth decline in stands located over 6 km from the pollution source was weaker or absent. Spruce trees were much less affected by the phenomenon of local pollution than fir trees. We analyzed the dynamics of resilience indices and average radial growth indices and found that the period in which the trees suffered the most from local pollution was between 1978 and 1984. Growth recovery of the intensively polluted stand was observed after the 1990s when the environmental condition improved because of a significant reduction in air pollution.

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.

scholarly journals Mechanism of groundwater inrush hazard caused by solution mining in a multilayered rock-salt-mining area: a case study in Tongbai, China

2018 ◽  
Vol 18 (1) ◽  
pp. 79-90 ◽  
Author(s):  
Bin Zeng ◽  
Tingting Shi ◽  
Zhihua Chen ◽  
Liu Xiang ◽  
Shaopeng Xiang ◽  
...  
Keyword(s):  
Rock Salt ◽  
Water Inrush ◽  
Simulation Method ◽  
Mining Area ◽  
Geological Structure ◽  
Pollution Source ◽  
Groundwater Inrush ◽  
Solution Mining ◽  
Brine Leakage ◽  
Salt Mining

Abstract. The solution mining of salt mineral resources may contaminate groundwater and lead to water inrush out of the ground due to brine leakage. Through the example of a serious groundwater inrush hazard in a large salt-mining area in Tongbai County, China, this study mainly aims to analyse the source and channel of the inrushing water. The mining area has three different types of ore beds including trona (trisodium hydrogendicarbonate dihydrate, also sodium sesquicarbonate dihydrate, with the formula Na2CO3 × NaHCO3 × 2H2O, it is a non-marine evaporite mineral), glauber (sodium sulfate, it is the inorganic compound with the formula Na2SO4 as well as several related hydrates) and gypsum (a soft sulfate mineral composed of calcium sulfate dihydrate, with chemical formula CaSO4 × 2H2O). Based on characterisation of the geological and hydrogeological conditions, the hydrochemical data of the groundwater at different points and depths were used to analyse the pollution source and the pollutant component from single or mixed brine by using physical–chemical reaction principle analysis and hydrogeochemical simulation method. Finally, a possible brine leakage connecting the channel to the ground was discussed from both the geological and artificial perspectives. The results reveal that the brine from the trona mine is the major pollution source; there is a NW–SE fissure zone controlled by the geological structure that provides the main channels through which brine can flow into the aquifer around the water inrush regions, with a large number of waste gypsum exploration boreholes channelling the polluted groundwater inrush out of the ground. This research can be a valuable reference for avoiding and assessing groundwater inrush hazards in similar rock-salt-mining areas, which is advantageous for both groundwater quality protection and public health.

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