A reinforcement method of floor grouting in high-water pressure working face of coal mines: a case study in Luxi coal mine, North China

Zhai, Minglei; Bai, Haibo; Wu, Luyuan; Wu, Guangzhi; Yan, Xianzhen; Ma, Dan

doi:10.1007/s12665-021-10144-4

Cited by 17 publications

(11 citation statements)

References 34 publications

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“…(5) Intermittent mining for thick coal seams with horizontal or inclined stratification can, to a certain extent, reduce the damage to the overlying rock strata, which in turn can reduce the surface subsidence caused by coal mining in the overlap area [ 43 ], and finally indirectly reduce its impact on ancient wooden buildings.…”

Section: Resultsmentioning

confidence: 99%

Influence of Coal Mining on Historical Buildings: Case Study in Shanxi

Sun

Zhu

Peng

et al. 2023

IJERPH

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Numerous historical buildings exist in Shanxi Province, a major coal producing area in China, so there exist many overlapping areas between ancient wooden buildings and coal mining. Coal mining in overlapping areas will lead to surface subsidence, which will have an impact on historical buildings. Based on the distribution of historical buildings and the distribution and mining of coal resources in Shanxi Province, this paper concludes that the overlapping areas of coal mining and ancient wooden buildings in Shanxi Province are mainly concentrated in Changzhi City, and the Lu’an mining area in Changzhi City is selected as the research object. In addition, using the gray correlation analysis method, the surface subsidence coefficient, which characterizes the intensity of mining subsidence, is used as the reference sequence. Seven factors selected from the geological conditions and mining conditions of the Lu’an mining area are used as the comparison sequence to calculate the gray correlation between each influencing factor and the surface subsidence coefficient, and to obtain that geological factors such as the nature of the overlying rock layer, bedrock thickness and dip angle of the coal seam, and mining factors such as mining height, average mining depth and working face size largely determine the surface subsidence coefficient. The surface subsidence in the overlap area could largely be influenced by geological factors such as the nature of the overlying rock layer, bedrock thickness and coal seam inclination, and mining factors such as mining height, average mining depth and working face size. Finally, we investigate the possible effects of surface subsidence on ancient wooden buildings in the overlapping area with the surface subsidence and formation mechanism and propose technical measures to reduce the effects of surface subsidence due to coal mining on historical buildings in the overlapping area.

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Section: Resultsmentioning

confidence: 99%

Influence of Coal Mining on Historical Buildings: Case Study in Shanxi

Sun

Zhu

Peng

et al. 2023

IJERPH

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“…Due to the growing threat of water disasters, it has become particularly important to detect water abundance within the seam floor before stoping. On the basis of The Detailed Rules for Water Disaster Prevention and Control of Coal Mines (NCMSA 2018), geophysical and drilling exploration methods should be applied simultaneously when a high-pressure karst aquifer and good water abundance exist in the coal seam floor [46]. Therefore, the transient electromagnetic method (TEM) and drilling exploration were used simultaneously to detect the floor of working face to detect the water bearing properties of the limestone.…”

Section: Detection Methods Of Water Abundance Of Working Face Floormentioning

confidence: 99%

“…According to observation data of water pressure, the floor of Working Face 2509 was subject to the highest hydrostatic pressure of limestone aquifer in the upper Taiyuan formation is 5.34 MPa. The calculation formula of safe head pressure in working face floor according to the NCMSA was [46…”

Section: Overview Of the Chensilou Coal Minementioning

confidence: 99%

“…As the floor of Working Face 2509 was complex a structure and fold developed, so the T S was selected according to the seam floor has been fractured to calculate the thickness of the aquitard. Then [46] M = P 0.06 (31) Therefore, to make the aquifuge thickness of Working Face 2509's floor reach the safety aquifuge (89 m) and realize the role of blocking water, it was finally determined to transform L8 to an aquitard, thereby ensuring the safe mining of Working Face 2509.…”

Section: Overview Of the Chensilou Coal Minementioning

confidence: 99%

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Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Zhai

Bai

2022

Mathematics

Self Cite

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Grouting is one of the main technical means to prevent water inrush hazards in coal seam floor aquifers. It is of great significance to elucidate the diffusion law of slurry in the process of grouting in fractured aquifers for safe mining in coal mines. In this paper, the mechanism of slurry diffusion in horizontal fractures of fractured aquifers was studied based on the Bingham slurry with time-varying characteristics; additionally, a one-dimensional seepage grouting theoretical model considering the temporal and spatial variation of slurry viscosity under constant grouting rate was established. In this model, the grouting pressure required by the predetermined slurry diffusion radius can be obtained by knowing the grouting hole pressure and injection flow. Slurry properties, fracture parameters, grouting parameters, and water pressure were the parameters affecting the slurry diffusion process. Looking at the problem of water disaster prevention of coal seam floor in the Working Face 2509 of the Chensilou Coal Mine, according to the aquifer parameters and model calculation results, a grouting scheme with a slurry diffusion radius of 20 m and grouting pressure of 12 MPa was proposed. Finally, with the comparative analysis of the transient electromagnetic method (TEM) and water inflow before and after grouting, it was verified that the design grouting pressure and the spacing of grouting holes were reasonable and the grouting effect was good.

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“…In this paper, 3D ERT is realized with arbitrary electrode positions, then water-rich floors can be detected in irregular working faces. This 3D ERT approach is used to detect the water-rich area and design the location of the grouting [25] holes. After grouting, the method is used to detect the grouting effect again [26].…”

Section: Introductionmentioning

confidence: 99%

Grouting Effect Detection within the Floor of a Coal Seam Using 3D Electric Resistivity Tomography (ERT) with Arbitrary Electrode Positions

Pang

Gao

et al. 2022

Applied Sciences

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To prevent the occurrence of water inrush from the working face floor, explorations of water-rich floors are necessary. For a working face with a regular shape, a water-rich floor can be detected by laying electrodes and cables around the working face. However, the rectangular working face develops an irregular shape, and the exploration of water in irregular working faces is a difficulty in the study of 3D electric resistivity tomography (ERT). In this paper, an unconventional dipole–dipole array is used for data acquisition and the potential of a non-grid point electrode is replaced by the potential of the surrounding electrode, which identifies a water-rich floor using 3D ERT with arbitrary electrode positions. Taking the 8826 irregular working face of the Baizhuang coal mine as an example, the working face is explored by 3D ERT, the anomalous area is delineated, and targeted grouting is carried out in the anomalous area. After grouting, the grouting effect is detected by 3D ERT, and the safe mining of the working face is ensured. The results show that grouting effect detection within the floor of a coal seam using 3D electric resistivity tomography (ERT) with arbitrary electrode positions could be applied to solving the problem of water-rich exploration of floors in irregular working faces.

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A reinforcement method of floor grouting in high-water pressure working face of coal mines: a case study in Luxi coal mine, North China

Cited by 17 publications

References 34 publications

Influence of Coal Mining on Historical Buildings: Case Study in Shanxi

Influence of Coal Mining on Historical Buildings: Case Study in Shanxi

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Grouting Effect Detection within the Floor of a Coal Seam Using 3D Electric Resistivity Tomography (ERT) with Arbitrary Electrode Positions

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