Experimental Investigation of the Compaction-Crushing Characteristics of Graded Fractured Coal Gangue Based on Infill Mining
The compaction and re-crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry. To study the compaction and re-crushing characteristics of the gangue particles, continuous grading and intermittent grading of two differen...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-12-01
|
| Series: | Fractal and Fractional |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2504-3110/7/1/33 |
| _version_ | 1797442334689853440 |
|---|---|
| author | Mingkun Pang Hongyu Pan Shihua Yang Shipeng Zhu Tianjun Zhang |
| author_facet | Mingkun Pang Hongyu Pan Shihua Yang Shipeng Zhu Tianjun Zhang |
| author_sort | Mingkun Pang |
| collection | DOAJ |
| description | The compaction and re-crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry. To study the compaction and re-crushing characteristics of the gangue particles, continuous grading and intermittent grading of two different structures were designed to study the bulk gangue particle size distribution. By conducting a side-limited uniaxial compression test on the crushed gangue, the compaction deformation parameters and particle re-crushing parameters of the samples under different axial pressure and grading conditions were calculated, the interaction between compaction and re-crushing was determined, and a compaction-re-crushing model of the crushed gangue was established. The following conclusions were obtained, (1) the axial displacement increment and fractal dimension of the graded crushed gangue are closely related to the graded structure of the skeletal particles; (2) the compaction stage of the graded crushed gangue can be divided into a fast compaction stage, a slow compaction stage, and a stable compaction stage—the fast compaction stage is significantly elastic, the slow compaction stage is more plastic, and the stable stage behavior approaches that of the original rock body; (3) the degree of crushing of the graded crushed gangue increases with an increase in axial stress, and the re-crushing of the specimen mainly occurs in the slow compaction stage; (4) the compaction-crushing-fractal evolution of the graded crushed gangue in the lateral limit compression process is established as the line of questioning. The physical significance of the parameters in the equation is discussed in this paper. The study can provide theoretical support and engineering guidance for the precise filling of a quarry and the prevention of later collapse. |
| first_indexed | 2024-03-09T12:40:20Z |
| format | Article |
| id | doaj.art-eecba18bb511483489dc767ad8dd258d |
| institution | Directory Open Access Journal |
| issn | 2504-3110 |
| language | English |
| last_indexed | 2024-03-09T12:40:20Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fractal and Fractional |
| spelling | doaj.art-eecba18bb511483489dc767ad8dd258d2023-11-30T22:19:16ZengMDPI AGFractal and Fractional2504-31102022-12-01713310.3390/fractalfract7010033Experimental Investigation of the Compaction-Crushing Characteristics of Graded Fractured Coal Gangue Based on Infill MiningMingkun Pang0Hongyu Pan1Shihua Yang2Shipeng Zhu3Tianjun Zhang4College of Energy, Xi’an University of Science and Technology, Xi’an 710054, ChinaCollege of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaCollege of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaCollege of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaCollege of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, ChinaThe compaction and re-crushing characteristics of crushed gangue are important factors which affect the quality and effectiveness of the filling of the quarry. To study the compaction and re-crushing characteristics of the gangue particles, continuous grading and intermittent grading of two different structures were designed to study the bulk gangue particle size distribution. By conducting a side-limited uniaxial compression test on the crushed gangue, the compaction deformation parameters and particle re-crushing parameters of the samples under different axial pressure and grading conditions were calculated, the interaction between compaction and re-crushing was determined, and a compaction-re-crushing model of the crushed gangue was established. The following conclusions were obtained, (1) the axial displacement increment and fractal dimension of the graded crushed gangue are closely related to the graded structure of the skeletal particles; (2) the compaction stage of the graded crushed gangue can be divided into a fast compaction stage, a slow compaction stage, and a stable compaction stage—the fast compaction stage is significantly elastic, the slow compaction stage is more plastic, and the stable stage behavior approaches that of the original rock body; (3) the degree of crushing of the graded crushed gangue increases with an increase in axial stress, and the re-crushing of the specimen mainly occurs in the slow compaction stage; (4) the compaction-crushing-fractal evolution of the graded crushed gangue in the lateral limit compression process is established as the line of questioning. The physical significance of the parameters in the equation is discussed in this paper. The study can provide theoretical support and engineering guidance for the precise filling of a quarry and the prevention of later collapse.https://www.mdpi.com/2504-3110/7/1/33infill miningfractal characteristicscrushed ganguecompactionparticle size fractalmechanical modelling |
| spellingShingle | Mingkun Pang Hongyu Pan Shihua Yang Shipeng Zhu Tianjun Zhang Experimental Investigation of the Compaction-Crushing Characteristics of Graded Fractured Coal Gangue Based on Infill Mining Fractal and Fractional infill mining fractal characteristics crushed gangue compaction particle size fractal mechanical modelling |
| title | Experimental Investigation of the Compaction-Crushing Characteristics of Graded Fractured Coal Gangue Based on Infill Mining |
| title_full | Experimental Investigation of the Compaction-Crushing Characteristics of Graded Fractured Coal Gangue Based on Infill Mining |
| title_fullStr | Experimental Investigation of the Compaction-Crushing Characteristics of Graded Fractured Coal Gangue Based on Infill Mining |
| title_full_unstemmed | Experimental Investigation of the Compaction-Crushing Characteristics of Graded Fractured Coal Gangue Based on Infill Mining |
| title_short | Experimental Investigation of the Compaction-Crushing Characteristics of Graded Fractured Coal Gangue Based on Infill Mining |
| title_sort | experimental investigation of the compaction crushing characteristics of graded fractured coal gangue based on infill mining |
| topic | infill mining fractal characteristics crushed gangue compaction particle size fractal mechanical modelling |
| url | https://www.mdpi.com/2504-3110/7/1/33 |
| work_keys_str_mv | AT mingkunpang experimentalinvestigationofthecompactioncrushingcharacteristicsofgradedfracturedcoalganguebasedoninfillmining AT hongyupan experimentalinvestigationofthecompactioncrushingcharacteristicsofgradedfracturedcoalganguebasedoninfillmining AT shihuayang experimentalinvestigationofthecompactioncrushingcharacteristicsofgradedfracturedcoalganguebasedoninfillmining AT shipengzhu experimentalinvestigationofthecompactioncrushingcharacteristicsofgradedfracturedcoalganguebasedoninfillmining AT tianjunzhang experimentalinvestigationofthecompactioncrushingcharacteristicsofgradedfracturedcoalganguebasedoninfillmining |