Seepage problems on fractured rock accompanying with mass loss during excavation in coal mines with karst collapse columns

Kong, Heng; Wang, Luzhen

doi:10.1007/s12517-018-3881-z

Cited by 24 publications

(12 citation statements)

References 16 publications

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“…where V 1 and V 2 are the total volume of coal before and after deformation occurs, respectively, (given in m 3 ); V ′ 1 and V ′ 2 are the volumes of the coal pores before and after deformation occurs, respectively, (given in m 3 ); and V 0 and V ′ 0 are the coal skeleton volumes before and after deformation occurs, respectively, (given in m 3 ).…”

Section: Porosity Of the Coal And Rockmentioning

confidence: 99%

“…Coal, which is the major energy supply in China, plays a leading role in serving the country's economic development . In China, most of the coal resources are buried deep underground.…”

Section: Introductionmentioning

confidence: 99%

“…Coal, which is the major energy supply in China, plays a leading role in serving the country's economic development. [1][2][3] In China, most of the coal resources are buried deep underground. The original coal seam, the surrounding rock, and the coalbed methane constitute an equilibrium system that existed before the coal seam was mined.…”

Section: Introductionmentioning

confidence: 99%

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Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Guo

Cui

et al. 2019

Energy Science & Engineering

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The abnormal emission of gas in coals is the main factor that induces serious gas disasters in coal mines. During the coal mining process, roof movement has important effects on the gas emission law and gas flow characteristics. In this study, an extremely thick coal seam under fully mechanized sublevel caving mining conditions from the Tashan coal mine in China was used as an example; the effect of roof weighting on gas emission in the goaf was studied. Then, the large roof weighting step and the small roof weighting step caused by the different thicknesses of lamprophyre breakage were used as the objects and a numerical simulation study on the gas flow characteristics in the goaf was carried out. The results indicate that the mining coal seams, the overlying adjacent unmined coal seams, and the goaf are the main contributors to the large gas emission capacity, and even situations exist where the gas concentration exceeds the limit in the working face. During roof weighting, the gas concentration and emission capacity in the return airway, upper corner, and high drainage roadway increase substantially. The results of the numerical analysis are in good agreement with the observed data, which indicates that it is effective to control the gas in coal seams by designing the location of high drainage roadway according to the mining characteristics of coal seam and the gas emission law.

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Section: Porosity Of the Coal And Rockmentioning

confidence: 99%

“…Coal, which is the major energy supply in China, plays a leading role in serving the country's economic development . In China, most of the coal resources are buried deep underground.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Guo

Cui

et al. 2019

Energy Science & Engineering

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“…More precisely, the water inrush of collapse column has the characteristics of concealment, abruptness, large water inrush value, and high harm, which is the hotspot and difficulty in the disaster-causing mechanism of water inrush in coal mine [2]. The geological structure of collapse column exists between the coal resource of Longtan formation and the aquifer of overlying Changxing formation, due to the overlap between late Permian coalfield and karst area in south China, especially with Guizhou province as the center, which is different from those in coal seam floor in the northern coal field [3]. The karst collapse column in coal seam roof tends to reactivate and conduct water in the mining process of working face and induce the serious water inrush disaster, when the karst collapse column communicates with the overlying aquifer, which poses a serious threat to safety production in coal mines [4].…”

Section: Introductionmentioning

confidence: 99%

Evolution Mechanism of Water-Conducting Channel of Collapse Column in Karst Mining Area of Southwest China

et al. 2021

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There are many karst collapse columns in coal seam roof in the southern coal field in China, which are different from those in coal seam floor in the northern coal field, due to the stratum characteristics. The karst collapse column in coal seam roof tends to reactivate and conduct water and induce the serious water inrush disaster, when the karst collapse column communicates with the overlying aquifer. In order to reveal the evolution mechanism of water-conducting channel of collapse column in karst mining area of southwest China, the aquifers and water inflow rule in 1908 working face in Qianjin coal mine are analyzed. Besides, the particle size distribution and mineral component of collapse column are researched by the X-ray diffraction test and the screening method, which are the basis for researching the water inrush mechanism in karst collapse column. On this basis, the water inrush of roof collapse column under the influence of mining is researched by establishing the numerical calculation model with the UDEC numerical software. The results show that the water flowing into the 1908 working face comes from the Changxing formation aquifer and Yulongshan formation aquifer above the coal seam, and the proportion of coarse particles and fine particles in collapse column is 89.86% and 10.14%, respectively. With the advance of working face, the water-conducting channel connected the working face with the aquifer, or the surface is formed by collapse pits, karst caves, and collapse column. The research results can be treated as an important basis for the water-preserved mining in southern coal field in China.

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“…Due to their concealed characteristics, the collapse columns become a serious environmental hazard, especially in important mining areas, causing potential damage to human life, property and the environment [2–3]. According to the site data statistics by the end of 2015, there are more than 2800 karst collapses all over 22 provinces in China [4]. Karst column collapses are distributed not only in northern China, but also in southern China.…”

Section: Introductionmentioning

confidence: 99%

Investigation on failure behavior of collapse column in China’s coal mine based on discontinuous deformation numerical method

et al. 2019

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Karst collapse column is a serious geological disaster in China’s coal mines. There are various karst collapse columns in coal mine areas, such as Huainan, Huaibei, Xingtai, Lu’an. And they have seriously affected mining safety and geological environment. The present research is focused on analyzing subsidence mechanism and dynamic collapse process. Based on mechanical analysis of thin plate theory, a detailed model of collapse column slipping and bending fracture is constructed to gather the critical conditions of the collapse column roof. The sensitivity parameters analysis shows that both the radius and roof thickness of cave have a great influence on the sliding instability and bending fracture. Meanwhile, the buried depth also affects bending failure. The discontinuous deformation analysis (DDA) method is used to simulate and analyze the collapse process. The numerical results indicate that the stability of inverted funnel collapse column is dominated by the bending stress of roof strata. The movement of columnar collapse column is mainly caused by sliding instability. However, the funnel collapse column is relatively stable, and does not change in the same condition. The displacement field analysis shows that the collapse range of inverted funnel collapse column is obviously larger than that of columnar collapse column, in which its maximum displacement is approximately 1.5 times that of the columnar collapse column. There is no large area collapse on the upper part of the funnel collapse column, and the block system is relatively stable. The principal stress field analysis proves the above results.

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Seepage problems on fractured rock accompanying with mass loss during excavation in coal mines with karst collapse columns

Cited by 24 publications

References 16 publications

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Effect of roof movement on gas flow in an extremely thick coal seam under fully mechanized sublevel caving mining conditions

Evolution Mechanism of Water-Conducting Channel of Collapse Column in Karst Mining Area of Southwest China

Investigation on failure behavior of collapse column in China’s coal mine based on discontinuous deformation numerical method

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