Study on Foamed Concrete Used as Gas Isolation Material in the Coal Mine Goaf

Xu, Chun Hua; Han, Lijun; Tian, Maolin; Wang, Yajie; Jin, Yuhao

doi:10.3390/en13174377

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…In recent years, researchers have applied this material to the goaf treatment field, providing advantages over traditional methods such as backfilling with solid materials or filling with water. It can be easily injected into the goaf through pipelines, filling up the space effectively, and thereby greatly reducing the risk of surface subsidence caused by goaf collapse [ 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Preparation and Performance of Foamed Lightweight Soil Grouting Material for Goaf Treatment

Zhao¹,

Chen²,

Zhang

et al. 2023

Materials

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The harm goafs and other underground cavities cause to roads, which could lead to secondary geological hazards, has attracted increased attention. This study focuses on developing and evaluating the effectiveness of foamed lightweight soil grouting material for goaf treatment. The study examines the foam stability of different foaming agent dilution ratios by analyzing foam density, foaming ratio, settlement distance, and bleeding volume. The results show that there is no significant variation in foam settlement distance for different dilution ratios, and the difference in foaming ratio does not exceed 0.4 times. However, the bleeding volume is positively correlated with the dilution ratio of the foaming agent. At a dilution ratio of 60×, the bleeding volume is about 1.5 times greater than that at 40×, which reduces foam stability. Furthermore, an appropriate amount of sodium dodecyl benzene sulfonate improves both the foaming ability of the foaming agent and the stability of the foam. Additionally, this study investigates how the water–solid ratio affects the basic physical properties, water absorption, and stability of foamed lightweight soil. Foamed lightweight soil with target volumetric weights of 6.0 kN/m3 and 7.0 kN/m3 meet the flow value requirement of 170~190 mm when the water–solid ratio ranges are set at 1:1.6~1:1.9 and 1:1.9~1:2.0, respectively. With an increasing proportion of solids in the water–solid ratio, the unconfined compressive strength initially increases and then decreases after 7 and 28 days, reaching its maximum value when the water–solid ratio is between 1:1.7 and 1:1.8. The values of unconfined compressive strength at 28 days are approximately 1.5–2 times higher than those at 7 days. When the water ratio is excessively high, the water absorption rate of foamed lightweight soil increases, resulting in the formation of connected pores inside the material. Therefore, the water–solid ratio should not be set at 1:1.6. During the dry–wet cycle test, the unconfined compressive strength of foamed lightweight soil decreases, but the rate of strength loss is relatively low. The prepared foamed lightweight soil meets the durability requirements during dry–wet cycles. The outcomes of this study may aid the development of enhanced approaches for goaf treatment using foamed lightweight soil grout material.

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Section: Introductionmentioning

confidence: 99%

Study on Preparation and Performance of Foamed Lightweight Soil Grouting Material for Goaf Treatment

Zhao¹,

Chen²,

Zhang

et al. 2023

Materials

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“…Compared with conventional goaf treatment ways, examples of these practices include backfilling using solid materials or filling techniques employing water, clay-cement composite grouting material and geopolymer grouting material have many advantages. For example, the material is conveniently inserted to gap via piping, effectively occupying goaf cavity as well as significantly mitigating the potential for surface subsidence resulting from goaf collapse (Xu et al, 2020;Shrestha et al, 2022). Wang et al proposed a new method of using coal gangue powder as the dominant component in grouting backfill materials for underground mining with optimized slurry transportability and compressive strength using urea and quicklime as additives (Wang et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Performance comparison of geopolymer and clay-cement grouting pastes and goaf effect evaluation of grouting backfilling method

Qin,

Shi,

Qin

et al. 2023

Front. Mater.

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The problem of goaf treatment has become more and more prominent, posing a significant risk to the safety of transportation and causing environmental damage if it is not treated properly. This study aims to conduct a comparative analysis of various grouting pastes and evaluate their application in goaf treatment according to grouting backfilling. This research begins by discussing different grouting pastes’ properties, including clay-cement composite grouting material and geopolymer grouting material, which have excellent engineering performance, environmental friendliness, and are easy to operate in complex geological environments. Moreover, the factors affecting the performance of grouting pastes, such as water-solid ratio and curing time, are also examined. Based on detailed information about the boreholes provided by drilling television, a reasonable treatment plan is formulated for goaf treatment. Finally, this study evaluates the effectiveness of different grouting pastes in real-world goaf treatment projects. The study draws the following conclusions: a direct relationship exists among flowability, setting time as well as water-solid ratio. An inverse relationship exists between the compressive strength of grouting materials and the water-solid ratio. Drilling data reveals complex goaf structures with defects such as water leakage, collapse and cavity, indicating potential geological risks in shallow areas. A treatment plan is formulated based on the geological conditions of goafs by drilling television. The effectiveness of backfill grouting in goaf areas is inspected using ground-penetrating radar (GPR) technology, and results indicate that adjusting water-solid ratio of grouting material can improve treatment effects.

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“…With the utilization of coal resources, the mining intensity increases year by year, and the underground mining conditions become more complex, resulting in an increase in disasters and accidents, such as fires, explosions, and outbursts. , After a coal mine disaster, the rapid sealing and isolation control of the disaster area can effectively prevent further accidents. , To improve the mine emergency response ability to deal with disasters and accidents, scholars conducted relevant research on the technology and equipment for rapid closed isolation of disaster areas after disasters. − Chang proposed a solidified door structure for a mine rescue cabin, established a three-dimensional model of a mine mobile protective closed door, and analyzed the strength of an arc door with ANSYS software. The results showed that the strength and stiffness of the arc door are better than those of the ordinary flat door.…”

Section: Introductionmentioning

confidence: 99%

“… 3 , 4 To improve the mine emergency response ability to deal with disasters and accidents, scholars conducted relevant research on the technology and equipment for rapid closed isolation of disaster areas after disasters. 5 − 7 Chang 8 proposed a solidified door structure for a mine rescue cabin, established a three-dimensional model of a mine mobile protective closed door, and analyzed the strength of an arc door with ANSYS software. The results showed that the strength and stiffness of the arc door are better than those of the ordinary flat door.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response Characteristics of a Sealing Airbag under Different Impact Types and Impact Pressures

Liu

Wei

et al. 2022

ACS Omega

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The rapid isolation of the disaster area underground coal mine can effectively prevent the spread of disaster accidents. Rapid sealing of the disaster area can be realized through sealing in the form of an inflatable capsule. The cushioning performance of the inflatable capsule to an explosion shock wave is an important factor affecting sealing reliability. The response process of a small inflatable capsule under an explosion shock wave was studied using the pipeline explosion experimental system to examine the dynamic response characteristics of the coal mine airbag under the impact load. The deformation buffering process of the inflatable and hydrogel capsules was tested by a drop hammer impact test. Results showed that under the action of three explosion impact pressures (0.3, 0.4, and 0.5 MPa), the inflatable capsule could absorb 22% of the impact energy through its deformation and reduce the maximum explosion impact pressure. Moreover, under the impact of falling weight at different heights (20, 30, 40, and 50 cm), the cushioning process of the inflatable and hydrogel capsules absorbed the impact energy through the compression deformation of the capsule, which is the loading stage. When the hammer speed decreased to zero, the deformation and absorbed energy of the capsule were at maximum. The capsule recovered its deformation and converted the absorbed energy into kinetic energy to make the hammer rebound, which is the unloading stage of the capsule. The capsule body realized the absorption and transfer of impact energy through its deformation and completed the energy buffer through the dynamic response process of multiple loading and unloading.

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Study on Foamed Concrete Used as Gas Isolation Material in the Coal Mine Goaf

Cited by 4 publications

References 21 publications

Study on Preparation and Performance of Foamed Lightweight Soil Grouting Material for Goaf Treatment

Study on Preparation and Performance of Foamed Lightweight Soil Grouting Material for Goaf Treatment

Performance comparison of geopolymer and clay-cement grouting pastes and goaf effect evaluation of grouting backfilling method

Dynamic Response Characteristics of a Sealing Airbag under Different Impact Types and Impact Pressures

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