scholarly journals Source Identification and Quantification of Seepage Water in a Coastal Mine, in China

Water ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 1862
Author(s):  
Xueliang Duan ◽  
Fengshan Ma ◽  
Jie Guo ◽  
Haijun Zhao ◽  
Hongyu Gu ◽  
...  
Keyword(s):  
Mine Water ◽  
Water Inrush ◽  
Principal Component ◽  
Seepage Water ◽  
Mixing Ratios ◽  
Flow Channels ◽  
Geological Conditions ◽  
Secondary Fractures ◽  
End Members ◽  
Supply Pattern

The Sanshandao gold mine, which is the largest coastal mine in China, is under threat from seawater intrusion and water inrush. The objective of this study is to determine the water end-members (seawater, freshwater, and brine) of the seepage water in the mine and quantify the proportion of end-members. Non-conservative ions and ion exchange were identified by using hydrogeochemical analysis. Then, the principal component analysis (PCA) was used to identify the end-members of mine water. Three end-members were identified, so a ternary mixture model was applied to compute the mixing ratios. The potential water flow channels and the prevailing supply patterns were inferred by combining the results of mixing ratios with the tectonic and engineering geological conditions. The results indicate that the proportion of seawater in mine water is about 57%, the freshwater is about 16% and the brine is about 27% for the entire mine area, the prevailing supply pattern of seawater was lateral recharge, the water samples which were located in −510 m sublevel or in the northeast of prospecting line 2260 had high proportions of seawater, the freshwater supplied the groundwater mainly through the secondary fractures developed area in a vertical recharge and the influence depth was about −500 m, and F3 was the largest tensile-shear fault in the study area and it was both a watercourse for seawater and fresh water.

scholarly journals Application of Clustering and Stepwise Discriminant Analysis Based on Hydrochemical Characteristics in Determining the Source of Mine Water Inrush

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Weitao Liu ◽  
Jie Yu ◽  
Jianjun Shen ◽  
Qiushuang Zheng ◽  
Mengke Han ◽  
...  
Keyword(s):  
Water Samples ◽  
Mine Water ◽  
Water Inrush ◽  
Principal Component ◽  
Hierarchical Cluster ◽  
Water Source ◽  
Stepwise Discriminant Analysis ◽  
Limestone Aquifer ◽  
Ordovician Limestone ◽  
Taiyuan Formation

In order to explore the law of groundwater evolution, the water source connection between faults and aquifers and the main sources of mine water inrush in the deep mining area of Yangcheng Coal Mine in Jining City, 40 groups of hydrochemical samples were collected and analyzed by Piper Diagram and Durov Diagram. The results showed that the fluidity of groundwater developing to the deep became weaker, the value of total dissolved solids (TDS) became larger. So, the roof and floor of coal seam were more similar in water quality types due to the conduction of faults. Using principal component analysis (PCA) to the raw data, two principal components were extracted, and the principal component scores were used as clustering variables for hierarchical cluster analysis (HCA), 5 groups of abnormal water samples were eliminated and 3 clustering groups M1, M2 and M3 were obtained from the other water samples on the tree diagram. The results showed that the combination of HCA and hydrochemical analysis was more effective in screening water samples, and the 3 clustering groups could be qualified samples to represent 3 major aquifers (Taiyuan Formation limestone aquifer, Shanxi Formation sandstone aquifer and Ordovician limestone aquifer). Finally, taking M1, M2 and M3 as grouping variables, the discriminant functions f 1 , f 2 and f 3 of the 3 aquifers were obtained, the results of stepwise discrimination analysis (SDA) showed that the discrimination model established by using 25 groups of standard water samples could discriminate the known water samples with the correct rate of 96%, 10 groups of unknown water samples collected at the fault are identified as Taiyuan Formation limestone water samples, which was consistent with the classification results of HCA, proving that the water inrush of fault DF53 was from Taiyuan Formation limestone aquifer, while the fault had little influence on Ordovician limestone aquifer.

scholarly journals Quantification of Water Sources in a Coastal Gold Mine through an End-Member Mixing Analysis Combining Multivariate Statistical Methods

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 580
Author(s):  
Guowei Liu ◽  
Fengshan Ma ◽  
Gang Liu ◽  
Jie Guo ◽  
Xueliang Duan ◽  
...  
Keyword(s):  
Statistical Methods ◽  
Water Inrush ◽  
Water Sources ◽  
Likelihood Method ◽  
Gold Mine ◽  
Multivariate Statistical Methods ◽  
Mining Operations ◽  
Multivariate Statistical ◽  
Mixing Ratios ◽  
End Members

Mixing calculations have been widely applied to identify sources of groundwater recharge, but these calculations have assumed that the concentrations of end-members are well known. However, the end-members of water remain unclear and are not easily available in practical applications. To better determine end-members and mixing ratios, an end-member mixing analysis combining multivariate statistical methods was used on a large, complex water chemistry dataset collected from the Shashandao gold mine in China. Multivariate statistical methods, including principal component analysis (PCA) and hierarchical cluster analysis (HCA), were applied to determine the specific end-members (these two methods verified each other). On the basis of the identified end-members, a maximum likelihood method was then used to estimate the mixing ratios of the water sources. The combined method proposed in this study can help to identify more accurate end-members and deal with uncertainty in end-member concentrations, and it can also adjust the concentrations until the optimal mixing ratios for the calculation are obtained. This method can be a powerful tool for groundwater management and in predicting water inrush in mining operations.

Water Controlling Research of Complex Fault Structures in Wugou Mine

2012 ◽  
Vol 616-618 ◽  
pp. 499-504
Author(s):  
Wen Quan Zhang ◽  
Wei Li ◽  
Guang Peng Zhang ◽  
Gui Bin Zhang
Keyword(s):  
Water Level ◽  
Mine Water ◽  
Water Movement ◽  
Weak Link ◽  
Water Pressure ◽  
Water Inrush ◽  
Normal Faults ◽  
Fault Structure ◽  
Geological Conditions ◽  
Fault Structures

Once the lead abutment pressure influence the fault structure, its internal rock mass is damaged easily while the fault structures are the most vulnerable of mining influence weak link. If the fault structures conduct the aquifer, the mine water inrush will occur. This paper researchs water level of Taiyuan limestone aquifer with three-dimensional form simulation and analyzes mine water movement characteristics and the change of water level and hydraulic contact of each aquifer combining with complex geological conditions of Wugou mine, aiming at tectonic evolution and tectonic combination characteristic of the mine, according to the long observation hole material. Combining with water pressure test results and drilling and geophysical prospecting achievement, using daubing coefficient method to analyze sealing of fault structure, we conclude that faults are pressure-torsional normal faults which their fault zone is compact and has high strength so we can narrow even do not leave set fault waterproof pillar in Wugou mine.

Groundwater flow simulation and its application in GaoSong ore field, China

2018 ◽  
Vol 10 (2) ◽  
pp. 276-284 ◽  
Author(s):  
Gang Chen ◽  
Shiguang Xu ◽  
Chunxue Liu ◽  
Lei Lu ◽  
Liang Guo
Keyword(s):  
Numerical Model ◽  
Flow Field ◽  
Groundwater Flow ◽  
Mine Water ◽  
Permeability Coefficient ◽  
Water Inrush ◽  
Seepage Field ◽  
Groundwater Seepage ◽  
Calculation Results ◽  
Groundwater Flow Field

Abstract Mine water inrush is one of the important factors threatening safe production in mines. The accurate understanding of the mine groundwater flow field can effectively reduce the hazards of mine water inrush. Numerical simulation is an important method to study the groundwater flow field. This paper numerically simulates the groundwater seepage field in the GaoSong ore field. In order to ensure the accuracy of the numerical model, the research team completed 3,724 field fissure measurements in the study area. The fracture measurement results were analyzed using the GEOFRAC method and the whole-area fracture network data were generated. On this basis, the rock mass permeability coefficient tensor of the aquifer in the study area was calculated. The tensor calculation results are used in the numerical model of groundwater flow. After calculation, the obtained numerical model can better represent the groundwater seepage field in the study area. In addition, we designed three different numerical models for calculation, mainly to explore the influence of the tensor assignment of permeability coefficient on the calculation results of water yield of the mine. The results showed that irrational fathom tensor assignment would cause a significant deviation in calculation results.

Scenario analysis of mine water inrush hazard using Bayesian networks

2016 ◽  
Vol 89 ◽  
pp. 231-239 ◽  
Author(s):  
Jiansong Wu ◽  
Shengdi Xu ◽  
Rui Zhou ◽  
Yueping Qin
Keyword(s):  
Bayesian Networks ◽  
Scenario Analysis ◽  
Mine Water ◽  
Water Inrush

scholarly journals Treatment Design and Construction Strategy for Tunnel Mud and Water Inrush Disaster

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
Yike Wei ◽  
Lingfeng Yu
Keyword(s):  
Rapid Development ◽  
Water Inrush ◽  
Construction Process ◽  
Transportation Industry ◽  
Treatment Efficiency ◽  
Geographical Environment ◽  
Geological Conditions ◽  
Treatment Measures ◽  
Construction Strategy ◽  
Treatment Design

With the rapid development of the transportation industry in China, the number and scale of tunnel construction are increasing. Tunneling through fault zones and other complex geological environments is becoming more and more common. In the construction of highway tunnels, due to the special geographical environment and complex geological conditions, mud and water inrush often occur in the tunnel. Water inrush disasters pose a major risk to the construction of highway tunnels and affect the normal construction of highway tunnels. This paper combines the engineering background of the tunnel mud and water inrush accidents, carries out evaluation on the accident treatment measures and the treatment efficiency, and summarizes the main concerns in the construction process and the technical guidelines for dealing with the tunnel mud and water inrush.

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