Effects of Lithology Combination Compaction Seepage Characteristics on Groundwater Prevention and Control in Shallow Coal Seam Group Mining
The mining of shallow coal seam groups triggers mine water inrush and ecological environment destruction. Effective groundwater prevention and control requires controlling the compaction and seepage characteristics (CSCs) of broken rock in goaf. In this study, the CSCs of roof lithology and goaf bro...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-06-01
|
| Series: | Applied Sciences |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2076-3417/15/12/6942 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849433599499042816 |
|---|---|
| author | Kaijun Miao Shihao Tu Wenping Li Jinghua Li Jinhu Tian Hongbin Zhao Jieyang Ma |
| author_facet | Kaijun Miao Shihao Tu Wenping Li Jinghua Li Jinhu Tian Hongbin Zhao Jieyang Ma |
| author_sort | Kaijun Miao |
| collection | DOAJ |
| description | The mining of shallow coal seam groups triggers mine water inrush and ecological environment destruction. Effective groundwater prevention and control requires controlling the compaction and seepage characteristics (CSCs) of broken rock in goaf. In this study, the CSCs of roof lithology and goaf broken rock combinations are experimentally investigated. The results indicate that, for samples with identical gradation, the percentage of void (PV) is minimized in sandstone–mudstone combinations, while PV increases with higher coal content. Initial compaction of composite samples is primarily governed by soft rock re-crushing, whereas the stable compaction stage is determined by the initial PV. Under low axial stress, the CSCs of lithological combination samples exhibit instability, with the mudstone layer reducing flow velocity by approximately 36% under equivalent compaction and seepage conditions. Particle migration, leading to the blockage of the seepage section, is an important cause of the decrease in permeability. Based on experimental findings, a stress–void–seepage coupling model is established to describe the compaction–seepage behavior of lithologic combination broken rock in shallow goafs. |
| format | Article |
| id | doaj-art-1fa7dd7b53d247bd8977e3cde85e9b84 |
| institution | Kabale University |
| issn | 2076-3417 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-1fa7dd7b53d247bd8977e3cde85e9b842025-08-20T03:26:57ZengMDPI AGApplied Sciences2076-34172025-06-011512694210.3390/app15126942Effects of Lithology Combination Compaction Seepage Characteristics on Groundwater Prevention and Control in Shallow Coal Seam Group MiningKaijun Miao0Shihao Tu1Wenping Li2Jinghua Li3Jinhu Tian4Hongbin Zhao5Jieyang Ma6School of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaShaanxi Energy Fengjiata Mining Operation Co., Ltd., Yulin 719400, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaSchool of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaThe mining of shallow coal seam groups triggers mine water inrush and ecological environment destruction. Effective groundwater prevention and control requires controlling the compaction and seepage characteristics (CSCs) of broken rock in goaf. In this study, the CSCs of roof lithology and goaf broken rock combinations are experimentally investigated. The results indicate that, for samples with identical gradation, the percentage of void (PV) is minimized in sandstone–mudstone combinations, while PV increases with higher coal content. Initial compaction of composite samples is primarily governed by soft rock re-crushing, whereas the stable compaction stage is determined by the initial PV. Under low axial stress, the CSCs of lithological combination samples exhibit instability, with the mudstone layer reducing flow velocity by approximately 36% under equivalent compaction and seepage conditions. Particle migration, leading to the blockage of the seepage section, is an important cause of the decrease in permeability. Based on experimental findings, a stress–void–seepage coupling model is established to describe the compaction–seepage behavior of lithologic combination broken rock in shallow goafs.https://www.mdpi.com/2076-3417/15/12/6942goafbroken rocklithologic combinationcompaction seepagewater resources protection |
| spellingShingle | Kaijun Miao Shihao Tu Wenping Li Jinghua Li Jinhu Tian Hongbin Zhao Jieyang Ma Effects of Lithology Combination Compaction Seepage Characteristics on Groundwater Prevention and Control in Shallow Coal Seam Group Mining Applied Sciences goaf broken rock lithologic combination compaction seepage water resources protection |
| title | Effects of Lithology Combination Compaction Seepage Characteristics on Groundwater Prevention and Control in Shallow Coal Seam Group Mining |
| title_full | Effects of Lithology Combination Compaction Seepage Characteristics on Groundwater Prevention and Control in Shallow Coal Seam Group Mining |
| title_fullStr | Effects of Lithology Combination Compaction Seepage Characteristics on Groundwater Prevention and Control in Shallow Coal Seam Group Mining |
| title_full_unstemmed | Effects of Lithology Combination Compaction Seepage Characteristics on Groundwater Prevention and Control in Shallow Coal Seam Group Mining |
| title_short | Effects of Lithology Combination Compaction Seepage Characteristics on Groundwater Prevention and Control in Shallow Coal Seam Group Mining |
| title_sort | effects of lithology combination compaction seepage characteristics on groundwater prevention and control in shallow coal seam group mining |
| topic | goaf broken rock lithologic combination compaction seepage water resources protection |
| url | https://www.mdpi.com/2076-3417/15/12/6942 |
| work_keys_str_mv | AT kaijunmiao effectsoflithologycombinationcompactionseepagecharacteristicsongroundwaterpreventionandcontrolinshallowcoalseamgroupmining AT shihaotu effectsoflithologycombinationcompactionseepagecharacteristicsongroundwaterpreventionandcontrolinshallowcoalseamgroupmining AT wenpingli effectsoflithologycombinationcompactionseepagecharacteristicsongroundwaterpreventionandcontrolinshallowcoalseamgroupmining AT jinghuali effectsoflithologycombinationcompactionseepagecharacteristicsongroundwaterpreventionandcontrolinshallowcoalseamgroupmining AT jinhutian effectsoflithologycombinationcompactionseepagecharacteristicsongroundwaterpreventionandcontrolinshallowcoalseamgroupmining AT hongbinzhao effectsoflithologycombinationcompactionseepagecharacteristicsongroundwaterpreventionandcontrolinshallowcoalseamgroupmining AT jieyangma effectsoflithologycombinationcompactionseepagecharacteristicsongroundwaterpreventionandcontrolinshallowcoalseamgroupmining |