Mechanism of Water Inrush of a Deep Mining Floor Based on Coupled Mining Pressure and Confined Pressure

2021 ◽  
Author(s):  
Yujun Zhang
Keyword(s):  
Water Inrush ◽  
Deep Mining ◽  
Mining Pressure

scholarly journals Analysis of Key Factors Affecting Water Disaster in Deep Mining and Establishment of a Water Disaster Evaluation Method Suitable for Different Mining Depths

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Jianghui He ◽  
Wenping Li ◽  
Wei Qiao ◽  
Zhi Yang ◽  
Qiqing Wang
Keyword(s):  
Water Inrush ◽  
Assessment Method ◽  
New Method ◽  
Specific Yield ◽  
Water Yield ◽  
Deep Mining ◽  
Hydrogeological Characteristics ◽  
Formula Method ◽  
Water Disaster

Deep mining is the current and future mining focus in the coalfield of North China. Therefore, it is necessary to establish a water inrush assessment method suitable for deep mining. The conventional water inrush coefficient ( T ) method is simple to use, but its accuracy is low when the mining depth is very small or large because it neglects the role of the aquifer water yield. The main purpose of this paper is to introduce a simple water inrush risk assessment method that is more applicable in deep mining than the T method. In this study, the hydrogeological characteristics in deep mining were studied and the role of the aquifer water yield in water inrush was analyzed. Afterwards, an improved T method considering the aquifer specific yield ( q ) was established. In the new method, the critical water inrush coefficient changes with changing q following a negative correlation. The parameter thresholds were determined based on systematic data analyses of 186 mining cases. The results of the statistical analysis show that the accuracy of the new method at different mining depths is higher than that of the T method.

scholarly journals Influence Law of Interbedded Strata and Their Collapse on the Mining of Extremely Thick Coal Seam under Goaf

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Chunxu Ji ◽  
Yongkang Yang ◽  
Xingyun Guo ◽  
Tianhe Kang ◽  
Zefeng Guo
Keyword(s):  
Coal Seam ◽  
Water Inrush ◽  
Theoretical Models ◽  
Pressure Control ◽  
Future Research ◽  
Simulation Experiments ◽  
Thick Coal Seam ◽  
Movement Characteristics ◽  
Mining Pressure ◽  
The Stability

Interbedded strata and their collapse are vital to mining pressure control for extremely thick coal seam under goaf. To ensure the stability of the support and to avoid roof collapse, some traditional underground pressure theoretical models had been widely used in the control of surrounding rock and the selection of support. However, one of the challenges for extremely thick coal seam under goaf is that the abnormal disasters, such as support crushing and water inrush that were occurring frequently. To solve this problem, the movement characteristics of overburden rocks during the mining of extremely thick coal seam under the conditions of the interlayer thickness of 5 m and 40 m were studied by using the similar simulation experiments, while the numerical simulation experiments were carried out for the interval between coal seams of 15 m and 60 m, respectively. Finally, the structure and mechanical transfer mechanism of overburden in stope under different thickness interbedded strata were analyzed dynamically, and the condition of full-thickness connection between upper goaf and lower goaf and corresponding judgment criteria are obtained. These results can guide future research on the mechanical of extremely thick coal seam under goaf, which can provide a theoretical basis and engineering reference for similar projects.

scholarly journals Gray Evaluation of Water Inrush Risk in Deep Mining Floor

ACS Omega ◽  
2021 ◽  
Author(s):  
Xingyue Qu ◽  
Xiaoge Yu ◽  
Xingwei Qu ◽  
Mei Qiu ◽  
Weifu Gao
Keyword(s):  
Water Inrush ◽  
Deep Mining

Water Inrush Prediction in DongShan Coal Mine Based on GIS and Multi-Source Information

2012 ◽  
Vol 518-523 ◽  
pp. 5780-5783
Author(s):  
Xiu Wei Shi ◽  
Yan Jun Feng ◽  
Xian Liu
Keyword(s):  
Prediction Model ◽  
Coal Mine ◽  
Water Pressure ◽  
Water Inrush ◽  
Source Information ◽  
Geological Structures ◽  
Related Factors ◽  
Mine Production ◽  
Pressure Water ◽  
Mining Pressure

Water inrush in coal mine could be considered as one of the major threats to the security of miners. Thus, it is necessary to forecast the risk of water inrush to ensure the safety of mine production. The mechanism of water inrush and the related factors, such as geological structures, mining pressure, water pressure and water resisting layer are analyzed. The water inrush prediction model was proposed and applied to DongShan coal mine based on GIS and multi-information. Compared with the water inrush status of DongShan coal mine, the results obtained from the water inrush prediction model are satisfied.

Comprehensive Assessment of Water Inrush Risk in Deep Mining of Beiminghe Iron Mine

2011 ◽  
Vol 261-263 ◽  
pp. 1348-1354
Author(s):  
Chang Hong Li ◽  
Li Xin Zhang
Keyword(s):  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Water Pressure ◽  
Water Inrush ◽  
Fuzzy Comprehensive Evaluation ◽  
Mathematic Model ◽  
Test Field ◽  
Deep Mining ◽  
Hydrogeological Characteristics ◽  
Iron Mine

In view of one-sidedness and the limitations in comprehensive evaluation index for water inrush risk, a variety of factors of water inrush induced by deep mining of Beiminghe iron mine are analyzed from hydrogeological characteristics, structural characteristics and mining. Faulted structure, water storage capacity, water pressure, water-resisting layer, miming effect and the change of stress in surrounding rock of two levels of deep mining in mine area are quantized by rock permeability test, field pumping test and finite element numerical analysis. Mathematic model of risk assessment of water inrush in deep mining of Beiminghe iron mine is established by using fuzzy comprehensive evaluation method. Quantitative assessment of water inrush risk is carried out to obtain the value of rank tendency for water inrush risk through that mathematic model.

Mechanical Model on Water Inrush Assessment Related to Deep Mining Above Multiple Aquifers

2019 ◽  
Vol 38 (4) ◽  
pp. 827-836 ◽  
Author(s):  
Liming Yin ◽  
Kai Ma ◽  
Juntao Chen ◽  
Yanchao Xue ◽  
Ziqi Wang ◽  
...  
Keyword(s):  
Mechanical Model ◽  
Water Inrush ◽  
Deep Mining ◽  
Multiple Aquifers

Numerical Simulation of Preventing Rock Burst with Hydraulic Cutting

2012 ◽  
Vol 524-527 ◽  
pp. 637-641 ◽  
Author(s):  
Yao Cheng ◽  
Yu Lin Ma ◽  
Yong Li Zhang
Keyword(s):  
Numerical Simulation ◽  
Rock Burst ◽  
High Stress ◽  
Element Model ◽  
Pressure Relief ◽  
Deep Mining ◽  
Before And After ◽  
Mining Pressure ◽  
Slot Cutting ◽  
The Finite Element Model

Rock burst become increasingly serious in deep mining. Pressure relief will be realized with hydraulic cutting in the coal seam, and rock burst could be substantial prevented. The finite element model of hydraulic cutting is established, the variation of stresses around the slot before and after hydraulic cutting are found by Ansys software. The results of numerical simulation show: The influence circle of differential pressure with hydraulic cutting is about 5 meters. In the circle the stresses fall down 81%. The pressure relief is best when the pitch of holes is 8 meters with multi-slot cutting. The surface high stress area is significantly reduced after slotting and the stress concentration zone transferred to the deep. Reasonably direction of cutting travel determined pressure relief, and the cutting distance could influence directly the dimension and scope of pressure relief. The simulation results provide a theoretical foundation and technical reference for preventing rock burst with hydraulic cutting.

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