Actively heated fiber optics method to monitor grout diffusion range in goaf

Chai, Jing; Ouyang, Yibo; Zhang, Dingding; Zhou, Yu; Zhang, Ruixin; Zhu, Lei; Gu, Wenzhe; Zhao, Mengye; Qiu, Fengqi; Xiong, Xianyu

doi:10.1016/j.yofte.2022.102952

Cited by 6 publications

(3 citation statements)

References 38 publications

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“…To ensure safe transportation of the slurry, a concentration of 70% was selected for the slurry preparation in this experiment. It can be observed that: (1) With the increase in slurry filling volume, the dynamic flow slope first decreases and then increases, and when the slurry filling volume reaches a certain capacity and continues to increase, the dynamic flow slope changes from linear to stepped. (2) When the slurry filling volume is 33m 3 , the dynamic flow slope of the gangue slurry is 5.6%.…”

Section: Establishment Of Field Test Modelmentioning

confidence: 99%

“…The issue of gangue emissions accompanying coal production is one of the key factors currently hindering the green and efficient development of the coal industry [1,2]. According to statistics, the accumulated amount of coal gangue in China has exceeded 6 billion tons, forming over 1,700 gangue mountains covering an area of more than 200,000 acres, with an annual emission rate increasing to approximately 700 million tons [3].…”

Section: Introductionmentioning

confidence: 99%

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Research and engineering practice on space characteristics of gangue slurry filling

Gu,

Yang,

Pan

et al. 2023

Preprint

Self Cite

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The macroscopic characteristics of the fractured space and the microscopic pore features are critical factors determining the effectiveness of gangue slurry backfilling. To identify the key areas for slurry backfilling, a combination of theoretical analysis, simulation experiments, and on-site industrial trials was used to reveal the movement laws of backfilling space overlying the fractured zone. The distribution characteristics of voids available for slurry backfilling within the fractured space were explored, and the interaction between gangue slurry and goaf voids was clarified. A formula for calculating the void ratio in the caved zone was derived, and a model for the distribution of voids in the slurry backfilling space was established. This model identified the main areas where slurry backfilling should be focused, namely the overlapping space between the free accumulation zone and the load-influenced zone. Experimental results demonstrated that the porosity of the collapsed rock mass within the goaf follows a negative logarithmic function along both the dip and strike directions, which was consistent with the theoretical calculations. Through in-situ grouting backfilling experiments on the ground, the feasibility of gangue slurry backfilling in the goaf was verified, and the process of interaction between gangue slurry and goaf voids was elaborated. This process generally involves three stages: initial flow, vertical upwelling, and horizontal diffusion, all of which are closely interconnected. Practical engineering applications of gangue slurry backfilling were carried out in the free accumulation zone and the load-influenced zone at the Huangling No.2 coal mine. The successful validation of underground gangue slurry backfilling technology demonstrated its feasibility and the correctness of the theoretical approach. This research provides new evidence for environmentally friendly disposal of gangue materials.

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Section: Establishment Of Field Test Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research and engineering practice on space characteristics of gangue slurry filling

Gu,

Yang,

Pan

et al. 2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The issue of gangue emissions accompanying coal production is one of the key factors currently hindering the green and efficient development of the coal industry 1 , 2 . According to statistics, the accumulated amount of coal gangue in China has exceeded 6 billion tons, forming over 1700 gangue mountains covering an area of more than 200,000 acres, with an annual emission rate increasing to approximately 700 million tons 3 .…”

Section: Introductionmentioning

confidence: 99%

Research and engineering practice on space characteristics of gangue slurry filling

Gu,

Yang,

Pan

et al. 2023

Sci Rep

Self Cite

View full text Add to dashboard Cite

The macroscopic characteristics of the fractured space and the microscopic pore features are critical factors determining the effectiveness of gangue slurry backfilling. To identify the key areas for slurry backfilling, a combination of theoretical analysis, simulation experiments, and on-site industrial trials was used to reveal the movement laws of backfilling space overlying the fractured zone. The distribution characteristics of voids available for slurry backfilling within the fractured space were explored, and the interaction between gangue slurry and goaf voids was clarified. A formula for calculating the void ratio in the caved zone was derived, and a model for the distribution of voids in the slurry backfilling space was established. This model identified the main areas where slurry backfilling should be focused, namely the overlapping space between the free accumulation zone and the load-influenced zone. Experimental results demonstrated that the porosity of the collapsed rock mass within the goaf follows a negative logarithmic function along both the dip and strike directions, which was consistent with the theoretical calculations. Through in-situ grouting backfilling experiments on the ground, the feasibility of gangue slurry backfilling in the goaf was verified, and the process of interaction between gangue slurry and goaf voids was elaborated. This process generally involves three stages: initial flow, vertical upwelling, and horizontal diffusion, all of which are closely interconnected. Practical engineering applications of gangue slurry backfilling were carried out in the free accumulation zone and the load-influenced zone at the Huangling No. 2 coal mine. The successful validation of underground gangue slurry backfilling technology demonstrated its feasibility and the correctness of the theoretical approach. This research provides new evidence for environmentally friendly disposal of gangue materials.

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Fluidity and rheological properties with time-dependence of cemented fine-grained coal gangue backfill containing HPMC using response surface method

Gu,

Yang,

Yang

et al. 2024

Construction and Building Materials

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Actively heated fiber optics method to monitor grout diffusion range in goaf

Cited by 6 publications

References 38 publications

Research and engineering practice on space characteristics of gangue slurry filling

Research and engineering practice on space characteristics of gangue slurry filling

Research and engineering practice on space characteristics of gangue slurry filling

Fluidity and rheological properties with time-dependence of cemented fine-grained coal gangue backfill containing HPMC using response surface method

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