Effects of Water Soaked Height on the Deformation and Crushing Characteristics of Loose Gangue Backfill Material in Solid Backfill Coal Mining
In solid backfill coal mining (SBCM), loose gangue backfill material (LGBM) is used to backfill the goaf after coal resources are exploited from the underground mines. Under certain geological conditions, LGBM with a certain height may be soaked in the water, and then becomes saturated, significantl...
Main Authors: | , , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
MDPI AG
2018-05-01
|
Series: | Processes |
Subjects: | |
Online Access: | http://www.mdpi.com/2227-9717/6/6/64 |
id |
doaj-4eb29d7366734c998ea2231a7bededf7 |
---|---|
record_format |
Article |
spelling |
doaj-4eb29d7366734c998ea2231a7bededf72020-11-25T00:27:23ZengMDPI AGProcesses2227-97172018-05-01666410.3390/pr6060064pr6060064Effects of Water Soaked Height on the Deformation and Crushing Characteristics of Loose Gangue Backfill Material in Solid Backfill Coal MiningJunmeng Li0Yanli Huang1Ming Qiao2Zhongwei Chen3Tianqi Song4Guoqiang Kong5Huadong Gao6Lei Guo7State Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaSchool of Mechanical and Mining Engineering, The University of Queensland, St. Lucia, QLD 4072, AustraliaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaState Key Laboratory of Coal Resources and Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, ChinaCollege of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, ChinaIn solid backfill coal mining (SBCM), loose gangue backfill material (LGBM) is used to backfill the goaf after coal resources are exploited from the underground mines. Under certain geological conditions, LGBM with a certain height may be soaked in the water, and then becomes saturated, significantly altering its mechanical properties. The confined compression experiments were used in this paper to analyze the deformation and the crushing characteristics of LGBM with varying water soaked heights in coal mines. The results showed that a large number of small holes that were distributed in the gangue blocks were the main reason why the material absorbed water and was softened. The crushing ratio and the maximum axial strain of LGBM samples gradually increased with the water soaked heights of the samples. In addition, there was a strong linear correlation between the crushing ratio and the maximum axial strain. When LGBM was used as a solid backfill material in SBCM, its deformation resistance would significantly decrease after it was soaked in the water. Higher water soaked height of LGBM led to lower deformation resistance and greater influence on the quality of backfilling. This research has great significance in getting a deep and better understanding of the mechanical properties of LGBM, as well as guiding engineering practice.http://www.mdpi.com/2227-9717/6/6/64solid backfill coal mininggoafwater soaked heightloose gangue backfill materialdeformationcrushing ratio |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Junmeng Li Yanli Huang Ming Qiao Zhongwei Chen Tianqi Song Guoqiang Kong Huadong Gao Lei Guo |
spellingShingle |
Junmeng Li Yanli Huang Ming Qiao Zhongwei Chen Tianqi Song Guoqiang Kong Huadong Gao Lei Guo Effects of Water Soaked Height on the Deformation and Crushing Characteristics of Loose Gangue Backfill Material in Solid Backfill Coal Mining Processes solid backfill coal mining goaf water soaked height loose gangue backfill material deformation crushing ratio |
author_facet |
Junmeng Li Yanli Huang Ming Qiao Zhongwei Chen Tianqi Song Guoqiang Kong Huadong Gao Lei Guo |
author_sort |
Junmeng Li |
title |
Effects of Water Soaked Height on the Deformation and Crushing Characteristics of Loose Gangue Backfill Material in Solid Backfill Coal Mining |
title_short |
Effects of Water Soaked Height on the Deformation and Crushing Characteristics of Loose Gangue Backfill Material in Solid Backfill Coal Mining |
title_full |
Effects of Water Soaked Height on the Deformation and Crushing Characteristics of Loose Gangue Backfill Material in Solid Backfill Coal Mining |
title_fullStr |
Effects of Water Soaked Height on the Deformation and Crushing Characteristics of Loose Gangue Backfill Material in Solid Backfill Coal Mining |
title_full_unstemmed |
Effects of Water Soaked Height on the Deformation and Crushing Characteristics of Loose Gangue Backfill Material in Solid Backfill Coal Mining |
title_sort |
effects of water soaked height on the deformation and crushing characteristics of loose gangue backfill material in solid backfill coal mining |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2018-05-01 |
description |
In solid backfill coal mining (SBCM), loose gangue backfill material (LGBM) is used to backfill the goaf after coal resources are exploited from the underground mines. Under certain geological conditions, LGBM with a certain height may be soaked in the water, and then becomes saturated, significantly altering its mechanical properties. The confined compression experiments were used in this paper to analyze the deformation and the crushing characteristics of LGBM with varying water soaked heights in coal mines. The results showed that a large number of small holes that were distributed in the gangue blocks were the main reason why the material absorbed water and was softened. The crushing ratio and the maximum axial strain of LGBM samples gradually increased with the water soaked heights of the samples. In addition, there was a strong linear correlation between the crushing ratio and the maximum axial strain. When LGBM was used as a solid backfill material in SBCM, its deformation resistance would significantly decrease after it was soaked in the water. Higher water soaked height of LGBM led to lower deformation resistance and greater influence on the quality of backfilling. This research has great significance in getting a deep and better understanding of the mechanical properties of LGBM, as well as guiding engineering practice. |
topic |
solid backfill coal mining goaf water soaked height loose gangue backfill material deformation crushing ratio |
url |
http://www.mdpi.com/2227-9717/6/6/64 |
work_keys_str_mv |
AT junmengli effectsofwatersoakedheightonthedeformationandcrushingcharacteristicsoflooseganguebackfillmaterialinsolidbackfillcoalmining AT yanlihuang effectsofwatersoakedheightonthedeformationandcrushingcharacteristicsoflooseganguebackfillmaterialinsolidbackfillcoalmining AT mingqiao effectsofwatersoakedheightonthedeformationandcrushingcharacteristicsoflooseganguebackfillmaterialinsolidbackfillcoalmining AT zhongweichen effectsofwatersoakedheightonthedeformationandcrushingcharacteristicsoflooseganguebackfillmaterialinsolidbackfillcoalmining AT tianqisong effectsofwatersoakedheightonthedeformationandcrushingcharacteristicsoflooseganguebackfillmaterialinsolidbackfillcoalmining AT guoqiangkong effectsofwatersoakedheightonthedeformationandcrushingcharacteristicsoflooseganguebackfillmaterialinsolidbackfillcoalmining AT huadonggao effectsofwatersoakedheightonthedeformationandcrushingcharacteristicsoflooseganguebackfillmaterialinsolidbackfillcoalmining AT leiguo effectsofwatersoakedheightonthedeformationandcrushingcharacteristicsoflooseganguebackfillmaterialinsolidbackfillcoalmining |
_version_ |
1725340230800637952 |