In this study, the main ions in groundwater from bedrock aquifers, both before and after strong mining, are used as indicators. Hydrochemical graphical methods, hierarchical cluster analysis (HCA), principal component analysis (PCA), ion ratio analysis, and conceptual modeling are employed, integrating paleotopography features, aquifer characteristics, and drainage data …
Piper diagram (group 1 and group 2 are, respectively, fourth aquifer and sandstone water, and group 3 is the water of air way and drainage way).
Slurry produced by limestone and marble quarrying can impact local karst aquifers, negatively affecting the groundwater quality and generating a remarkable environmental and economic damage. A very representative case-study is that of the Apuan Alps (north-western Tuscany, Italy) because of the intensive marble quarrying activity.
4. The damage evolution height of roof is largerat two ends and lower at the middle of the goaf. The damage degree of the roof reaches 0.6, and the height of damage evolution is about 120munder the condition of full mining. The damage degree of the floor strata reaches 0.75, and the depth of damage evolution is about 40m. Figure 4.
The results showed that exclusive pursuit of high-intensity mining would induce irreversible disasters including aquifer water loss and cultivated land damage; the degree of influence was directly ...
Using the experimental method of the numerical simulation,the influence of loose aquifer on overburden failure laws is studied.The results show that the overburden failure can be divided into tensile deformation zone,the tensile rupture and shear deformation zone and deformation zone.In the process of load transfer of loose aquifer,the load in the top of the bedrock interface is …
Consequently, quarry mining is an important economic activity which has the potential of contributing to the development of areas endowed with the resources. Mining activities have …
elopment, operation and closure. Groundwater can exert negative influences on mining economics by creating risks for operational continuity and miners' safety, as well as havi. ng …
DOI: 10.1007/s00603-024-03929-z Corpus ID: 269702041; Failure Mechanism and Movement Characteristics of Overlying Strata in Longwall Mining Face with Thick Aquifer @article{Wang2024FailureMA, title={Failure Mechanism and Movement Characteristics of Overlying Strata in Longwall Mining Face with Thick Aquifer}, author={Yuliang Wang and …
tural, and mining. Each of these areas exhibits unique characteristics that influence karst groundwater conditions. Industrial waste, domestic effluent, agricultural irrigation, and mining water drainage have all contributed to widespread shallow groundwater pollution, posing a significant threat to the quality of deep karst groundwater [26].
Changes in groundwater level, hydrochemistry, and aquifer parameters were studied by following disturbances caused by tunnel excavation in a panel in the Ningtiaota coalfield, northwest China. Temporal changes of hydrochemical compositions were evaluated based on time-series hydrochemical data in three boreholes (J2, J13, and SK8). The time series of hydraulic …
blast damage at the bottom of the proposed quarry pit. Furthermore, depending on ... it may be necessary to extend wells below the bottom of the quarry pit. The mining operator and the operator's ... proposed new pit or pit expansion may affect this zone of influence. When proposing an aquifer pumping test, describe in detail the methodology ...
Because the limits are set to prevent damage, damage to homes from blasting is unusual. Physical damage to wells or pipes is extremely rare. Before blasting damage can occur, the blast must produce enough energy to strain materials to the point of failure. Quarry blasting is designed to fracture only the rock within the quarry area.
Mining operations have the potential to alter ground-water flowpaths and change the sources of water to pumped wells. Previous ground-water-flow modeling of the area has shown that water …
Hydrographs for the monitoring boreholes that lie below (both down dip and down the hillside from) the quarry void (shown to Ordnance Datum). Note that all the hydrographs …
Pollutants were transported along a fault system and a hydraulic zone at 20 m depth and concentrated in the quarry.
The variation in radius of influence under confined and unconfined aquifer condition is assessed using a hypothetical case study with three operational quarry sites.
This coupled flow-stress-damage model is applied to examine the influence of mining advance on the initiation, extension, and evolution of an outburst conduit as it develops adjacent to the mine panel. Fractures are shown to initiate both from the wings of the excavation in shear, and from the center of the floor span, in extension.
Mining activities carried out above an aquifer, especially in the hanging wall of normal faults, generally involve the risk of water inrush. For a better understanding of the mechanism inducing groundwater outburst through fault floor, the analytical and numerical simulation methods were applied to investigate the process of fault activation driven by mining …
Mining exploitation influence range. Andrzej Kwinta. 2018, Natural Hazards. See Full PDF Download PDF. See Full PDF Download PDF. Related Papers. Engineering and enviro-management value of radius of influence estimate from mining excavation.
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Leitzen-Grabau Pit Water level Mining had minimal impact on aquifer water levels. Felton Pit Water level Mining has altered ground-water flow paths affecting the water supply to a calcareous fen. ... No damage from blasting or quarry operations was visible in any of the wells, including those within 20 ft to 200 ft of the quarry face. The wells ...
Heterogeneity of an aquifier's internal hydraulic structure affects the accuracy of radius of influence determination. Faults with a high amplitude may significantly affect the …
Recently, with the increasing mining activities under this aquifer, abnormal roof water-inrush disasters have frequently occurred in this region, seriously threatening the miner's life and mining equipment [1], [2], [3]. ... [20], leading to the damage effect in the overburden in a certain degree. The damage effect may influence the evolution ...
Drawdown is greatest nearest the quarry and is generally less with distance from the quarry, forming a cone-like shape with the quarry at the center. The areal extent of this shape is called the zone of influence. The zone of influence is not fixed and is affected by pumping at the mine, geological factors, and the amount of precipitation
No.9 coal seam in Jinsha area of Qianbei coalfield is an outburst coal seam. In order to liberate the outburst coal seam, it is necessary to first mine 3 coal seam as the liberated layer of No.9 coal seam. However, 3 coal seam in Jinsha area is close to the Maokou limestone aquifer in the floor, and there is a danger of water bursting in mining 3 coal seam. Taking …
According to the WRCC in the mining area under the influence of mining and coal mine underground reservoirs, this paper classifies the WRCC of the mining area into 5 levels of surplus carrying, appropriate carrying, moderate carrying, critical carrying and carrying deficit (Table 1). The evaluation value of the corresponding grade is given to ...
Limestone mining at Lanjiberna limestone and dolomite quarry has created positive as well negative impacts on ground water. With further deepening of the mine, drawdown trend (negative effect) is observed and at the same time ground water recharge of the order of 4,527.48 m3/day, through mine pits (positive impact) is noticed. The aquifer present in …
The value of Ro for an unconfined aquifer can be readily calculated using the following equation: p Ro = 3000 ðH hÞ K ð1Þ where, Ro is the radius of influence for unconfined aquifers (in metres), H is the total head of the water table aquifer (in m, saturated thickness), K is the hydraulic conductivity (in meters per second i.e., m/s), h is ...
Quarries and pits can affect ground-water and surface-water systems in various ways. This project focused on the following potential impacts: . temperature change (thermal impacts) in …
The blasting in the adjacent quarry would cause the existing tunnel structure damage and strength weakening. But the degree of damage to the tunnel structure and the stress redistribution state caused by adjacent blasting need to be accurately quantified and evaluated. In order to find out the actual situation of the disease and judge the current stability of the tunnel, …
To ensure the safe mining of the working face under the complex bedrock aquifer, determining the danger range of the aquifer and the bedrock structure and predicting the …
Limestone mining at Lanjiberna limestone and dolomite quarry has created positive as well negative impacts on ground water. With further deepening of the mine, drawdown trend (negative effect) is ...
aquifers are relatively low yielding, bedding planes and secondary structures such as frac-tures and faults could form preferential ˚ ow and transport paths for contaminants from mining activities into the quarry. A continuous hydrocensus at the study site indicated that the quarry had high sulfate concentrations resulting in an elevated elec-
Map of various land damage in Heze mining area According to FIG. 2, there are 10 land types of damaged cultivated land, residential land, water area and water conservancy facilities land, garden ...
With further deepening of the mine and quarry, the drawdown can impact on water supply wells and base flow. The variation in radius of influence under confined and unconfined …
NICOR Mineral Ventures, Inc. retained Neyer, Tiseo and Hindo, Ltd. to evaluate the potential effects of a planned dewatering operation at NICOR's proposed, 258-acre silica sand …
The damage caused by coal mining to these impermeable layers determines the level of impact that coal mining has on the target aquifer, and ultimately has a varying degree of adverse effects on the eco-geology environment. ... According to the degree of influence of underground coal mining on phreatic aquifer, with the aim of win-win between ...
Figure 9: Influence of 32 coal seam mining on water level of the quaternary aquifer. - "The Cause of Drop of the Water Level of Underground Quaternary Aquifer of a Mine under Mining Influence"
Overburden deformation and damage caused by coal seam mining is the main cause of water loss from aqui- fer. This paper aims at the problem of limited research on the water loss law of aquifer under the influence of mining the medium and deep coal seams in Yushen mining area. According to the geological and hydrogeological structure characteristics of overburden rock of …