Impact of coal mining on groundwater of Luohe Formation in Binchang mining area

Sun, Kui Li; Li-min, Fan; Xia, Yucheng; Li, Cheng; Chen, Jianping; Gao, Shi; Wu, Boyun; Peng, Jie; Ji, Yiwei

doi:10.1007/s40789-020-00366-5

Cited by 35 publications

(17 citation statements)

References 8 publications

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“…At the same time, the microcracks continue to develop, the damage increases, the porosity of the rock n increases, and the effective elastic modulus 􏽥 E decreases. e sum caused by elastic deformation can be calculated according to formulas (8) and (11). Here, we will focus on the change Δp 2 in pore water pressure caused by plastic deformation.…”

Section: Pore Water Pressure: B-c "Increase-decrease" Transitional Stagementioning

confidence: 99%

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Study on the Variation Rule and Characteristics of Pore Water Pressure in the Failure Process of Saturated Rock

Zhang

2021

Shock and Vibration

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With the development of tunnels and other engineering constructions into the deep strata, rock masses are more prone to dynamic damage such as rock bursts under in situ conditions and excavation disturbances. The pore water in the rock mass will produce pressure changes during this process. According to the relationship between the change of pore water pressure and the development of rock mass damage, the variation rule and precursor characteristics of pore water pressure in the process of rock mass failure can be found. In this paper, through mechanical analysis, the evolution law of pore water pressure during the failure process of saturated rock is obtained. The study found that, in the process of rock failure, the pore water pressure presents three stages of linear growth, transition, and decrease. The rise and fall of pore water pressure are closely related to rock damage and influence each other. Through the observation of pore water pressure during coal mining, it is found that the coseismic effect of pore water pressure is significant. It is proved that there is a close correlation between the evolution of the stress field in the surrounding area of the stope and the change of pore water pressure in the surrounding area under the effect of mining disturbance. During the engineering practice, dynamic monitoring can be carried out on the change of pore water pressure inside the rock mass according to the law, and the precursor information of rock mass instability and failure can be explored.

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Section: Pore Water Pressure: B-c "Increase-decrease" Transitional Stagementioning

confidence: 99%

“…erefore, the interaction relationship between rock damage propagation and pore water pressure changes can be deeply studied to explore the precursor information of critical fracture pore water pressure of rock mass [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Study on the Variation Rule and Characteristics of Pore Water Pressure in the Failure Process of Saturated Rock

Zhang

2021

Shock and Vibration

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“…After the closure of coal mines due to low economic benefit or resource exhaustion, the surface water and groundwater contained in the aquifer rapidly fill underground spaces through the fissured zone, causing a drop in groundwater level, water pollution, surface subsidence, changes in the geological environment, and secondary disasters (Li et al 2019;Sun et al 2021). Within the framework of clean-energy production and ecological restoration of the post-mining areas, considerable efforts have been made worldwide to use geothermal energy, water, and spaces in abandoned coal mines.…”

Section: Introductionmentioning

confidence: 99%

Energy evolution and water immersion-induced weakening in sandstone roof of coal mines

Liu

Yang

Zhang

et al. 2022

Int J Coal Sci Technol

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The instability of underground spaces in abandoned coal mines with water-immersed rocks is one of the main hazards hindering the geothermal energy use and ecological restoration of post-mining areas. This study conducted graded cyclic loading–unloading tests of five groups of sandstone samples with different water contents. The evolution of input, elastic, dissipated, damping, and plastic energies were explored, considering the damping effect. The normalized plastic energy serves to characterize the damage evolution of sandstone samples, whose failure characteristics were analyzed from both the macroscopic and microscopic perspectives. X-ray diffraction technique and scanning electron microscopy were used to reveal the softening mechanism of sandstone. The results show that under graded cyclic loading, input energy, elastic energy, and dissipated energy all increase gradually, and the fraction of elastic energy increases gradually at first and then tends to stabilize. The variation in the fraction of dissipated energy is opposite to that of elastic energy. In each cycle, the input energy is stored primarily in the form of elastic energy, whereas the dissipated energy is used primarily to overcome the damping of sandstone. When the normalized number of cycles approached unity, the plastic energy fraction sharply increases, while that of the dampening energy drops abruptly. With increasing water content, the effect of pore water on the lubrication, the water wedge, and dissolution of mineral particles becomes more obvious, reducing the elastic-storage limit of sandstone, meanwhile the sandstone damage factor increases significantly under the same cycle and the failure mode changes from brittle to ductile.

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“…Underground coal mining experience has indicated that the LHFA is the main source of water that rushes in from the mine roof and causes disasters in the mining area. 4 Meanwhile, the LHFA has good recharge capability, and it is very difficult to thoroughly drain. In the Binchang mining area, the Gaojiapu coal mine is the deepest one, with a depth reaching 1000 m. At present, four panels, including 12 longwall working (LW) faces, have been developed and they all underlie the highly watery LHFA.…”

Section: Introductionmentioning

confidence: 99%

“…4 coal seam is the Cretaceous Luohe Formation aquifer (LHFA), which is rich in water, as shown in Figure a. Underground coal mining experience has indicated that the LHFA is the main source of water that rushes in from the mine roof and causes disasters in the mining area . Meanwhile, the LHFA has good recharge capability, and it is very difficult to thoroughly drain.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Behavior of Coal Samples during Water Saturation

Zhou

Song

et al. 2021

ACS Omega

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When mining-induced fractures reach overlying aquifers, water enters the mining area and the coal is under different natural water saturation conditions, which significantly affect the mechanical behavior of the coal. In this study, uniaxial compression tests were conducted on dry, partially saturated, quasi-saturated, and fully saturated coal samples. The mechanical parameters, acoustic emission (AE) activities, and failure patterns of differently saturated coal samples were analyzed. The effect of water content on the behavior of coal and suggestions to ensure safe underground coal mining were discussed. The results indicate that the water content in coal increases nonlinearly with intrusion time and can be regarded as a logarithmic function. With increasing water saturation, the mechanical strength of the coal decreases on the whole and the AE activities, crack development, and burst severity are weakened significantly. The failure pattern of the coal samples changes from a dynamic type to a quasi-static one and from a compressive-shear type to a tensile one. Water content has four main effects on the mechanical behavior of the coal samples. These are a liquid bridge force, a water softening effect, a wedge effect, and a lubrication effect. With increasing water saturation, the effect of water gradually increases and predominates the coal failure, leading to a continuous decline in the strength of the coal samples. When the coal around the mining space is subjected to water, the high degree of water saturation in the coal decreases the risks of coal bursts significantly; however, it causes a large deformation and instability of the roadways. To ensure safe mining, more measures should be taken to decrease the amount of inrushing water, reduce the stress, and reinforce the anchor bolting support.

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Impact of coal mining on groundwater of Luohe Formation in Binchang mining area

Cited by 35 publications

References 8 publications

Study on the Variation Rule and Characteristics of Pore Water Pressure in the Failure Process of Saturated Rock

Study on the Variation Rule and Characteristics of Pore Water Pressure in the Failure Process of Saturated Rock

Energy evolution and water immersion-induced weakening in sandstone roof of coal mines

Experimental Study on the Mechanical Behavior of Coal Samples during Water Saturation

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