scholarly journals Effect of Coal Mining on Springs in the Yushenfu Mining Area of China

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Li-min Fan ◽  
Tao Li ◽  
Maoxi Xiang ◽  
Weizhong He ◽  
Boyun Wu ◽  
...  
Keyword(s):  
Coal Mining ◽  
Large Scale ◽  
Monitoring And Evaluation ◽  
Mining Area ◽  
Water Inflow ◽  
Ecological Effect ◽  
Total Flow ◽  
Watershed Ecology ◽  
Before And After ◽  
Infiltration Recharge

The main purpose of this study was to analyze the effect of coal mining on the springs in the Yushenfu mining area of China. The results of two springs and hydrological surveys conducted in 1994 and 2015 were compared to study the occurrence and evolution of springs before and after large-scale mining. The mechanism of spring evolution and ecological effects of domain evolution were analyzed by combined groundwater monitoring and evaluation of coal mining intensity. The results show that the maximum amount of single water inflow of spring with sand infiltration recharge was more than 10 L/s, the total amount of single water inflow of spring with mixed infiltration recharge was the highest, and the ecological effect of spring with loess infiltration recharge was the most significant. In the study area, 2580 springs (group) were distributed with a total flow of 4998.9428 L/s before 1994 and 376 residual springs (group) were present with a total flow of 996.392 L/s in 2015. Large-scale mining decreased the regional groundwater level, thus decreasing the amount of spring water. The high intensity of mining decreased the number of springs (group) and area of water and wetland in the study area. This directly affected the watershed ecology; the ecological degradation was significant.

scholarly journals Water Preservation and Conservation above Coal Mines Using an Innovative Approach: A Case Study

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2818
Author(s):  
Yujun Xu ◽  
Liqiang Ma ◽  
Yihe Yu
Keyword(s):  
Coal Mining ◽  
Water Conservation ◽  
Large Scale ◽  
Influencing Factor ◽  
Mining Area ◽  
Mining Operations ◽  
Narrow Strip ◽  
Geological Conditions ◽  
The Impact

To better protect the ecological environment during large scale underground coal mining operations in the northwest of China, the authors have proposed a water-conservation coal mining (WCCM) method. This case study demonstrated the successful application of WCCM in the Yu-Shen mining area. Firstly, by using the analytic hierarchy process (AHP), the influencing factors of WCCM were identified and the identification model with a multilevel structure was developed, to determine the weight of each influencing factor. Based on this, the five maps: overburden thickness contour, stratigraphic structure map, water-rich zoning map of aquifers, aquiclude thickness contour and coal seam thickness contour, were analyzed and determined. This formed the basis for studying WCCM in the mining area. Using the geological conditions of the Yu-Shen mining area, the features of caved zone, water conductive fractured zone (WCFZ) and protective zone were studied. The equations for calculating the height of the “three zones” were proposed. Considering the hydrogeological condition of Yu-Shen mining area, the criteria were put forward to evaluate the impact of coal mining on groundwater, which were then used to determine the distribution of different impact levels. Using strata control theory, the mechanism and applicability of WCCM methods, including height-restricted mining, (partial) backfill mining and narrow strip mining, together with the applicable zone of these methods, were analyzed and identified. Under the guidance of “two zoning” (zoning based on coal mining’s impact level on groundwater and zoning based on applicability of WCCM methods), the WCCM practice was carried out in Yu-Shen mining area. The research findings will provide theoretical and practical instruction for the WCCM in the northwest mining area of China, which is important to reduce the impact of mining on surface and groundwater.

Ecological Risk Assessment of Yulin Coal Mining Area: Based on the PETAR Method

2013 ◽  
Vol 726-731 ◽  
pp. 1115-1120 ◽  
Author(s):  
Li Zhang
Keyword(s):  
Risk Assessment ◽  
Coal Mining ◽  
Qualitative Evaluation ◽  
Mining Area ◽  
Ecological Effects ◽  
Ecological Effect ◽  
Ecological Risks ◽  
Mining Areas ◽  
Coal Mining Area ◽  
Risk Sources

In order to unravel the correlation and causality between multi-stressor sources, multi-risk receptors and multi-type ecological effects of the Yulin Coal Mining Area. Through qualitative evaluation, this study preliminarily described the main stressor sources, risk receptors and the largest ecological effect over the Yulin coal mining area and progressive and conductive relation among the stressor sources, risk receptors and ecological effects using the Procedure for Ecological Tiered Assessment of Risk method (PETAR). The PETAR method seems to be operable and effective in evaluating coal mining areas ecological risks with multiple risk sources, risk receptors and multi-type ecological effects.

scholarly journals Evolution Analysis of Microseismic Events before and after Mining through Large-Scale Weak Zone with High Confined Water

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jing Jia ◽  
Xianjie Hao ◽  
Guanghui Zhao ◽  
Yubao Li ◽  
Xiaoyu Chuai ◽  
...  
Keyword(s):  
Energy Level ◽  
Coal Mining ◽  
Large Scale ◽  
Confined Aquifer ◽  
Confined Water ◽  
Weak Zone ◽  
Joint Influence ◽  
Before And After ◽  
Microseismic Events ◽  
The Difference

The existence of large-scale weak zone will have a great adverse impact on coal mining in high confined aquifer. Taking the Wutongzhuang Coal Mine which is threatened by high-pressure water as an example, this paper studies the difference between the microseismic events before and after mining and analyzes the influence of the large size weak zone on the coal mining on the confined aquifer. The research results show that the microseismic characteristics of the large soft weak belt are small number of events, the spatial distribution of events is concentrated, and the energy level is large. The amplitude of microseismic events is higher, and the proportion of large events in microseismic events is larger than that of small events; the characteristics of microseismic events caused by mining face mining are that the number of events is more, the distribution of events is loose, the distribution of roof and floor is more, the energy level is less, the amplitude is smaller, and the proportion of small and medium events in microseismic events is larger than that of large events. Due to the joint influence of large-scale weak zone of floor and mining, the floor in the middle area of working face is affected by mining, the number of microseismic events in each aquifer increases suddenly, the karst fissures between the aquifers are further developed, and there is a trend of transfixion. Therefore, measures such as floor grouting should be taken to reinforce the large-scale weak zone before mining.

scholarly journals SIKAP MASYARAKAT DESA HUTAN TERHADAP PERUBAHAN DAN ALIH GUNA KAWASAN HUTAN MENJADI KAWASAN PERTAMBANGAN BATUBARA

2016 ◽  
Vol 12 (3) ◽  
pp. 216
Author(s):  
Hafizianor Hafizianor
Keyword(s):  
Rural Communities ◽  
Coal Mining ◽  
Social Environment ◽  
Environmental Conditions ◽  
Public Attitudes ◽  
Mining Area ◽  
Coal Mining Area ◽  
Mining Region ◽  
Before And After ◽  
Editing Process

Change and use change forest into coal mining area has led to changes in the biophysical environment and social environment forest villagers. This study aimed to analyze the attitudes towards  changes in environmental conditions biophysical and social environment of rural communities around the mining of coal before and after the change and use change forest into coal mining region. The study was conducted in Tanah Bumbu, South Kalimantan. The method used to achieve the purpose of the study is the quantitative approach. Quantitative data from the data collecting through questionnaire will be processed through the editing process is researching the answers to the questionnaire, coding which classifies respondents consisting of three scales and then calculate the frequency based data distribution and tabulation. The results of the study public attitudes to change and use change forest into the area of coal mining and public attitudes show a positive attitude, which means it is a change to changing environmental conditions biophysical and social environment of rural communities around the mining of coal before and after the change and transfer of forest land use be a coal mining region.

Ground deformations associated with underground coal-mining observed by Sentinel-1 SAR images in vegetated area

2020 ◽  
Author(s):  
Yonghong Zhang ◽  
Hong’an Wu ◽  
Yong Luo ◽  
Yonghui Kang ◽  
Hongdong Fan
Keyword(s):  
Winter Wheat ◽  
Coal Mining ◽  
Large Scale ◽  
Central Government ◽  
Underground Mining ◽  
Mining Area ◽  
Least Square ◽  
Whole Process ◽  
Ground Deformations ◽  
Multi Temporal

<p>Coal is the largest energy source for China, and over 90% coal production in China is from underground mining. However, underground mining usually trigger large-scale ground deformations, which tend to develop as hazards. Therefore, the central government of China issued the “green mine” policy in 2017, which requires to strictly implement scientific and orderly exploitation and keeping the disturbance to the mining area and surrounding environment within the limits of sustainable development in the whole process of coal mining. This policy necessitates accurate monitoring of ground deformations induced by underground mining. Satellite Interferometric SAR (InSAR), especially the multi-temporal InSAR techniques have been successfully used to monitor deformations associated with underground mining. But temporal decorrelation still remains a big challenge because many underground mining takes place beneath farmland or forested region. Given the advantages of Sentinel-1 (S-1) in short revisit time, small baselines and free accessibility, underground mining deformations can be monitored somehow with S-1 InSAR in vegetated areas. In this research we report such an application in an underground coal-mine site located in Xuzhou, Jiangsu province of China. Four working panels are investigated</p><p>The working panels are all beneath farmland where winter wheat is sowed before the end of October and reaped around next late May, then corn or rice is planted during the coming summer season from June to September. Therefore the C-band S-1 interferograms can keep good coherence only when both images are acquired in the period of late October to next early April (this period is called coherent period thereafter) when the newly planted winter wheat is in its early growing stage. Three subsets of S-1 images acquired during three consecutive coherent periods  are used to generate mining-induced ground deformations.</p><p>During each coherent period, all of the interferograms with 12-day separation and some of the interferograms with 24-day separation and good coherence are selected and phase-unwrapped. Then these two sets of unwrapped interferograms are stacked, and finally the temporal deformations along SAR line-of-sight (LOS) are calculated under the least square principle. The temporal and spatial characteristics of the LOS deformation time series (DTS) are analyzed by considering extraction stage and extraction parameters of the working panel. Based on the analysis, we can diagnose whether the underground exploitation overstepped its designed boundary, or whether the working panel has been exploited for longer time than the designed extraction period.</p><p> </p>

scholarly journals Sustainable Development of Resources and the Environment: Mining-Induced Eco-Geological Environmental Damage and Mitigation Measures—A Case Study in the Henan Coal Mining Area, China

2019 ◽  
Vol 11 (16) ◽  
pp. 4366 ◽  
Author(s):  
Guo ◽  
Guo ◽  
Tan ◽  
Bai ◽  
Zhao
Keyword(s):  
Coal Mining ◽  
Large Scale ◽  
Management Practices ◽  
Mining Industry ◽  
Transitional Zone ◽  
Mining Area ◽  
Atmospheric Environment ◽  
Mitigation Measures ◽  
Environmental Damage ◽  
Geological Environment

Coal is an important resource that has supported China’s economic development. This situation is expected to continue in the immediate future. However, coal mining has also led to serious environmental disasters in some mining areas. Henan Province is one of the 14 large-scale coal bases that are planned by the Chinese state. It is located in the transitional zone between the second and third terrain ladders of China and spans two tectonic units. The geological features and ecological environmental characteristics display wide spatial variations throughout this district, which is an ecologically fragile region of stepped transition type. However, large-scale, extremely intense coal mining activities will inevitably lead to further deterioration of the already fragile ecological and geological (eco-geological) environment, which makes recovery increasingly difficult. Based on the condition of the eco-geological environment and the coal mining industry in the Henan mining area, the mechanisms by which mining-induced damage can occur were analyzed. The characteristics and status of the destruction of ground structures, land resources, water resources, the atmospheric environment, and natural ecology are discussed in this paper. Appropriate mitigation measures are proposed based on the findings. This mainly includes: management practices to prevent and mitigate damage throughout all stages of mining; adoption of mining techniques that will control damage at the source; and, the adoption of appropriate post-mining recovery technologies. The analysis of mining-induced eco-geological environmental damage and mitigation measures is of importance for the prevention of eco-geological disasters, and the promotion of efficient and environmentally sustainable exploitation of coal resources.

Study on Fully-Mechanized Top Coal Caving Mining under Water Body with Shallow Overburden and Thin Bedrock

2013 ◽  
Vol 734-737 ◽  
pp. 644-649 ◽  
Author(s):  
Lei Li ◽  
Zhi Guo Liu ◽  
Pei Pei Chen ◽  
Gui Liu
Keyword(s):  
Numerical Simulation ◽  
Coal Mining ◽  
Water Body ◽  
Mining Area ◽  
Research Area ◽  
Water Inflow ◽  
Geological Condition ◽  
Geological Model ◽  
Simulation Based ◽  
Thin Bedrock

Based on the geological condition of MaHuangliang coal in the Yushen mining area, the paper systematically studied the overburden's destructiverules of fully-mechanized top coal caving, and established hydro-geological model of research area by using GMS numerical simulation. Based on the model, the paper predicted the water inflow of different aquifer, analyzed the influence of aquifer to coal mining, and introduced the technical plans about fully-mechanized top coal caving mining under water body with shallow overburden and thin bedrock.

The Effect of Active Site-inhibited Factor VIIa on Tissue Factor-initiated Coagulation Using Platelets before and after Aspirin Administration

1997 ◽  
Vol 78 (04) ◽  
pp. 1202-1208 ◽  
Author(s):  
Marianne Kjalke ◽  
Julie A Oliver ◽  
Dougald M Monroe ◽  
Maureane Hoffman ◽  
Mirella Ezban ◽  
...  
Keyword(s):  
Tissue Factor ◽  
Active Site ◽  
Large Scale ◽  
Thrombin Generation ◽  
Factor Viia ◽  
Dependent Manner ◽  
Antithrombotic Agent ◽  
Before And After ◽  
Ic50 Values

SummaryActive site-inactivated factor VIIa has potential as an antithrombotic agent. The effects of D-Phe-L-Phe-L-Arg-chloromethyl ketone-treated factor VIla (FFR-FVIIa) were evaluated in a cell-based system mimicking in vivo initiation of coagulation. FFR-FVIIa inhibited platelet activation (as measured by expression of P-selectin) and subsequent large-scale thrombin generation in a dose-dependent manner with IC50 values of 1.4 ± 0.8 nM (n = 8) and 0.9 ± 0.7 nM (n = 7), respectively. Kd for factor VIIa binding to monocytes ki for FFR-FVIIa competing with factor VIIa were similar (11.4 ± 0.8 pM and 10.6 ± 1.1 pM, respectively), showing that FFR-FVIIa binds to tissue factor in the tenase complex with the same affinity as factor VIIa. Using platelets from volunteers before and after ingestion of aspirin (1.3 g), there were no significant differences in the IC50 values of FFR-FVIIa [after aspirin ingestion, the IC50 values were 1.7 ± 0.9 nM (n = 8) for P-selectin expression, p = 0.37, and 1.4 ± 1.3 nM (n = 7) for thrombin generation, p = 0.38]. This shows that aspirin treatment of platelets does not influence the inhibition of tissue factor-initiated coagulation by FFR-FVIIa, probably because thrombin activation of platelets is not entirely dependent upon expression of thromboxane A2.

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