Impact of karst water on coal mining in North China

Li, Gongyu; Zhou, Wanfang

doi:10.1007/s00254-005-0102-3

Cited by 92 publications

(44 citation statements)

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“…The extraction of this important resource is often associated with groundwater inrush accidents. Indeed, more than 90% of the casualties in mining work accidents in China are due to water inflow from karst aquifers into the mine through the floor of the coal seam (Li and Zhou, 2006). According to recent statistics (State Administration of Coal Mine Safety, 2014), during the 2000's, groundwater inrush accidents in…”

Section: Introductionmentioning

confidence: 99%

“…In addition to threatening the safety of mining operations, groundwater inrush also causes pollution due to mine spillage (Li and Zhou, 2006;Wu and Zhou, 2008;Zhu and Wei, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The results from these investigations show that high pressure groundwater can break through the reduced stress zones around the mining face and leak into the working areas which can potentially trigger the hazardous water inrush incident (Li et al, 2011;Miao et al, 2011a). The characteristics of confined aquifer, combined with the mining-induced strata failure (Meng et al, 2016) and the inherent geological structures of the field (Huang et al, 2016), such as water conducting faults, are among the main factors that set off such events (Li and Zhou, 2006;Li et al, 2011;Wu and Zhou, 2008;Zhang et al, 2014;Zhu et al, 2013;Zhu and Wei, 2011). As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Variations of hydraulic properties of granular sandstones during water inrush: Effect of small particle migration

Rezania

et al. 2017

Engineering Geology

196

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The evaluation of the hydraulic properties evolution of granular sandstones in relation with groundwater inrush within faults is an important issue for mining engineering applications. This paper presents the results of an experimental investigation of small particle migration from granular sandstone samples under different original porosities, particle size compositions and water flow pressures. A new rock testing system has been setup to carry out the tests. Based on the results, it is observed that the overall permeability evolution during the tests can be divided into four different phases, including i) re-arrangement of large rock fragments, ii) water inrush with substantial particle migration, iii) continued moderate particles seepage, and iv) steady state water flow. The crushing of edges and corners of large rock fragments, and the evolution of the fracture network has mainly been observed in the first two phases of the tests. The results indicate that the migration of small particles has an essential effect on permeability and porosity increase during water inrush through fractured sandstone. The samples with higher original porosity, higher percentage of fine particles in their formation and under higher water flow pressures, achieve higher permeability and porosity values when the test is complete. Furthermore, using the measured data, the performances of a number of empirical models, for permeability evolution in fractured porous media, have been studied. The prediction results indicate that not all of the fractures in a sample domain contribute in small particle migration. There are parts of the fracture network that are not effective in particle flow, a sample with less original porosity, more fine particles and under lower water pressure shows less ineffective fractures. Therefore, using the concept of the effective porosity (fracture) is sufficient enough for the flow calculation.Keywords: granular sandstone; groundwater inrush; particle migration; permeability; porosity. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT

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Section: Introductionmentioning

confidence: 99%

“…In addition to threatening the safety of mining operations, groundwater inrush also causes pollution due to mine spillage (Li and Zhou, 2006;Wu and Zhou, 2008;Zhu and Wei, 2011).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variations of hydraulic properties of granular sandstones during water inrush: Effect of small particle migration

Rezania

et al. 2017

Engineering Geology

196

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“…Severe conflicts of interest are especially noteworthy regarding human life and the exploitation of energy resources [12][13][14][15][16][17][18][19][20][21][22][23][24]. Exploitation activities inevitably cause ground subsidence, water loss, building damage, and a series of other problems, especially in some eco-environmental fragile areas [3,[25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

“…Among the 96 state-owned key coal mines, 71% are in water-shortage mining areas. One of the major coal mining areas, Northwest China, including Inner Mongolia, Shanxi, and Ningxia, is an arid to semi-arid area and a vulnerable eco-geological environment [19,21,42,43]. In those places, water resources are extremely scarce, and its protection is of vital importance.…”

Section: Introductionmentioning

confidence: 99%

A Novel Caving Model of Overburden Strata Movement Induced by Coal Mining

Peng

Xiang

et al. 2017

Energies

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Abstract:The broken pattern of the overburden strata induced by mining has a non-ignorable effect on overlying strata movement, failure, and safety in mining production. To study the caving pattern of overlying strata and determine the calculation method of fracture pathway parameters due to roof caving induced by coal mining, the trapezoidal broken models were developed to explain and prevent water leakage, and even water inrush, during the mining process. By incorporating the variation of the volume expansion coefficient, a connection among the parameters of the fracture pathways and fracture angles, face width, and mining height could be established, which shows that the larger the degree of the fracture angle is, the smaller the value of the volume expansion coefficient and face width is with a relatively larger mining height. This relationship was also used to determine the eventual evolution configuration of the trapezoidal broken model. The presented approaches may help us to better understand the movement of overburden strata and provide an idea to help settle conflicts related to fracture space calculations induced by coal mining.

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The possible hydrologic effects of the proposed lignite open‐cast mining in Drama lignite field, Greece

Panilas

Petalas

Gemitzi

2007

Hydrological Processes

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Abstract:The present study investigates the possible hydrologic effects of the proposed lignite open-cast mining in Drama lignite field (north Greece). Recent years have seen a rapid increase in surface mining. This activity has generated a growing concern for the potential environmental impacts associated with large scale surface mining.In order to achieve a safe mine operation and allow extraction of lignite to considerable depths, extensive dewatering by pumping will be necessary, while at the same time it is desirable to avoid presence of overpumping conditions in the broader area. Based on stratigrafic, hydrologic and hydrogeologic data, a three-dimensional finite difference model was developed in order to simulate the dewatering process of the western part of the lignite open-cast mine in Drama and to predict both spatially and temporally the decline of ground water level down to the lignite surface. The dewatering of the part of the aquifer which underlies the mine area will influence the hydrological conditions of the broader region. The most important anticipated effects will be the abandonment of shallow wells as well as the decrease of ground water pumping rates of deep wells. Aquifer discharge towards the ditches of the study area will cease and there will be an inversion of ground water flow from the ditches towards the underlying aquifer. Dewatering activities will probably result in minor subsidence of the nearby peat deposits of Drama Philippi marshes. Moreover, sand pumping as well as the presence of gasses is likely to cause local subsidence phenomena, mainly in the pit slopes.

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Impact of karst water on coal mining in North China

Cited by 92 publications

References 1 publication

Variations of hydraulic properties of granular sandstones during water inrush: Effect of small particle migration

Variations of hydraulic properties of granular sandstones during water inrush: Effect of small particle migration

A Novel Caving Model of Overburden Strata Movement Induced by Coal Mining

The possible hydrologic effects of the proposed lignite open‐cast mining in Drama lignite field, Greece

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