An experimental study of the influence of lithology on compaction behaviour of broken waste rock in coal mine backfill

Li, Meng; Zhang, Jixiong; Wu, Zhongya; Liu, Yu; Li, Ailing

doi:10.1098/rsos.182205

Cited by 14 publications

(5 citation statements)

References 21 publications

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“…At present, relevant reports of crushed gangue's bearing compression characteristics mainly focus on the particle size distribution, stress level, and macroscopic deformation. In addition, the final crushing ratio of crushed gangue samples is mainly obtained by screening the samples after the experiment [30][31][32][33][34][35][36][37][38][39][40][41][42]. However, there is no research on particle crushing characteristics during the loading process, especially under the compression condition of different loading rates.…”

Section: A Comparative Discussion With Existing Studiesmentioning

confidence: 99%

Experimental Study on Acoustic Emission of Confined Compression of Crushed Gangue under Different Loading Rates: Disposal of Gangue Solid Waste

Huang

Zhai³

et al. 2020

Sustainability

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The crushed gangue materials which are filled into the goaf in solid-backfilling coal mining become the main body of bearing the overburden after the tamping process. Its resistance to deformation is the key to control overburden movement and surface subsidence. Particle breakage affects the resistance to deformation of filling materials. In this paper, a confined compression test of crushed gangue under different loading rates was designed, and the acoustic emission (AE) signal was monitored in the process of confined compression. The test results showed that with the increase of loading rate, the anti-deformation ability of crushed gangue showed a dynamic change process of increasing, decreasing, and then increasing again. With the increase of loading rate, the breakage degree of the samples decreased, the proportion of large-sized gangue increased, the growth period of AE counts showed an obvious hysteresis phenomenon, and the AE activity level of the gangue increased gradually. The research results can not only provide a more in-depth and comprehensive understanding of the mechanical properties of crushed gangue filling materials but also provide a reference for the engineering application of solid-filling coal mining.

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Section: A Comparative Discussion With Existing Studiesmentioning

confidence: 99%

Experimental Study on Acoustic Emission of Confined Compression of Crushed Gangue under Different Loading Rates: Disposal of Gangue Solid Waste

Huang

Zhai³

et al. 2020

Sustainability

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“…Different lithologies of crushed stone backfill exhibit distinct compaction behaviors. Selecting appropriate lithologies for crushed stone and effectively controlling their particle size distribution and mixing ratios can improve the stability and stiffness of the backfill material [32].…”

Section: The Influence Of Composition On the Characteristics Of Filli...mentioning

confidence: 99%

Coal Mine Solid Waste Backfill Process in China: Current Status and Challenges

Bo,

Yang,

Liu

et al. 2023

Sustainability

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Coal mine solid waste backfill is a coal mining method employed to safeguard subterranean and surface geological formations, as well as water resources, against impairment. It stands as a pivotal technical approach for realizing ecologically sustainable mining endeavors, aiming to address China’s predicament of ’three down’ coal pressure, coal gangue emissions, and land resource scarcity. This manuscript delves into an in-depth exploration of the evolution and research status pertaining to solid backfill technology, encompassing backfill materials, rock mechanics, backfill processes, and their application across China’s coal sector. The developmental challenges and technical intricacies linked to solid backfill technology within coal mines are meticulously scrutinized. Building upon these challenges and complexities, this study sets forth a progressive trajectory for solid backfill technology within the contemporary era. This trajectory envisions the synchronized advancement of novel solid backfill materials, intelligent surveillance and regulation methodologies, and machine learning technologies for backfill quality assessment. By doing so, the overarching aim of achieving superlative quality, heightened efficiency, and automation in solid backfill practices can be effectively realized.

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“…As shown in Figure 2, a WAW-600B microcomputer was used as the compacting and loading equipment to control the electrohydraulic servo universal testing machine. Hydraulic power servo control technology, electrohydraulic servo control technology, computer data acquisition and processing, highprecision material testing equipment with closed-loop control, and automatic detection utilized in this testing equipment can realize the closed-loop control of constant-rate loading, constantrate deformation, constant-rate displacement, and constant-rate strain to verify the performance of materials (Li et al, 2019).…”

Section: Tests On the Compactness Of Gangue Experimental Equipment And Schemementioning

confidence: 99%

Experimental Study on the Compaction and Deformation of Filling Gangue by Reducing Waste Gangue for Filling Mining

et al. 2021

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The coal mining technology of fully mechanized solid filling is an efficient and green mining method that integrates “sediment reduction” and “emission reduction.” However, the discharge of wasted gangue and surface subsidence are controlled by the amount of wasted gangue used in filling mining and the compaction rate of gangue filled into a goaf, respectively. To increase the consumption of wasted gangue and reduce surface subsidence, mixed gangue composed of equal-quality washed gangue and crushed gangue is proposed as a raw material for solid filling on the basis of gradation theory. Next, a screening experiment was performed to analyze the grain gradation of different specimens, and a compression experiment was executed to compare and analyze the compression characteristics. The results show that the nonuniformity coefficient of mixed gangue is 55.2 and the curvature coefficient is 1.53, which significantly improve the grain gradation of washed gangue. The degree of relative compaction of mixed gangue is 1.226, which is significantly lower than that of washed gangue, which is 1.33. The deformation modulus of mixed gangue is 23–135 MPa, which is better than that of washed gangue (26–100 MPa), indicating that the compressive resistance of mixed gangue is significantly improved. The case study of the Tangkou mine suggests that mixed gangue greatly promotes the consumption of wasted gangue and can effectively control the surface deformation.

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An experimental study of the influence of lithology on compaction behaviour of broken waste rock in coal mine backfill

Cited by 14 publications

References 21 publications

Experimental Study on Acoustic Emission of Confined Compression of Crushed Gangue under Different Loading Rates: Disposal of Gangue Solid Waste

Experimental Study on Acoustic Emission of Confined Compression of Crushed Gangue under Different Loading Rates: Disposal of Gangue Solid Waste

Coal Mine Solid Waste Backfill Process in China: Current Status and Challenges

Experimental Study on the Compaction and Deformation of Filling Gangue by Reducing Waste Gangue for Filling Mining

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