Grouting failure mechanism and new pre-grouting reinforcement technology of narrow coal pillar in fully-mechanized caving gob-side entry
Abstract With the wide application of large machinery in coal mining, the influence of mine pressure is large and wide. Therefore, it is very important to retain and maintain the strength of coal pillars in the working face section. But the traditional narrow coal pillar grouting technology often ca...
Saved in:
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-06-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-03710-4 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850136631950966784 |
|---|---|
| author | Dongdong Chen Zhixuan Zhang Shuaishuai Yue Chunyang Tian Qingbo Jia Shengrong Xie Wenkang Zhao Jingchen Chang Xiangyu Yang Fuxing Xie Hao Pan |
| author_facet | Dongdong Chen Zhixuan Zhang Shuaishuai Yue Chunyang Tian Qingbo Jia Shengrong Xie Wenkang Zhao Jingchen Chang Xiangyu Yang Fuxing Xie Hao Pan |
| author_sort | Dongdong Chen |
| collection | DOAJ |
| description | Abstract With the wide application of large machinery in coal mining, the influence of mine pressure is large and wide. Therefore, it is very important to retain and maintain the strength of coal pillars in the working face section. But the traditional narrow coal pillar grouting technology often causes grouting failure due to slurry leakage. In order to avoid this situation, the pre-grouting solidification technology is put forward. Through theoretical analysis and speculation, numerical simulation, field test and monitoring and other methods, this article discusses the shortcomings of traditional grouting methods, the causes of grouting failure, and the reasons for grouting failure, the characteristics of fracture distribution in narrow coal pillar, the concrete implementation method of pre-grouting solidification technology and the reasonable selection of grouting time. The results show that the high fracture development within the narrow coal pillar has good grouting permeability, and the coal pillar is pre-grouting reinforced before the excavation of the roadway along the goaf, combined with the flexible thin-layer shotcrete layer and reasonable grouting time, the solidification of narrow coal pillar has achieved good results, and has constructed a good surrounding rock environment for excavation and support of roadway. |
| format | Article |
| id | doaj-art-42a59520456c4dac82aa53472d428de8 |
| institution | OA Journals |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-42a59520456c4dac82aa53472d428de82025-08-20T02:31:04ZengNature PortfolioScientific Reports2045-23222025-06-0115111510.1038/s41598-025-03710-4Grouting failure mechanism and new pre-grouting reinforcement technology of narrow coal pillar in fully-mechanized caving gob-side entryDongdong Chen0Zhixuan Zhang1Shuaishuai Yue2Chunyang Tian3Qingbo Jia4Shengrong Xie5Wenkang Zhao6Jingchen Chang7Xiangyu Yang8Fuxing Xie9Hao Pan10School of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy Science and Engineering, Henan Polytechnic UniversitySchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingBeijing China Coal Mine Engineering Co., Ltd.School of Energy and Mining Engineering, China University of Mining and Technology-BeijingAbstract With the wide application of large machinery in coal mining, the influence of mine pressure is large and wide. Therefore, it is very important to retain and maintain the strength of coal pillars in the working face section. But the traditional narrow coal pillar grouting technology often causes grouting failure due to slurry leakage. In order to avoid this situation, the pre-grouting solidification technology is put forward. Through theoretical analysis and speculation, numerical simulation, field test and monitoring and other methods, this article discusses the shortcomings of traditional grouting methods, the causes of grouting failure, and the reasons for grouting failure, the characteristics of fracture distribution in narrow coal pillar, the concrete implementation method of pre-grouting solidification technology and the reasonable selection of grouting time. The results show that the high fracture development within the narrow coal pillar has good grouting permeability, and the coal pillar is pre-grouting reinforced before the excavation of the roadway along the goaf, combined with the flexible thin-layer shotcrete layer and reasonable grouting time, the solidification of narrow coal pillar has achieved good results, and has constructed a good surrounding rock environment for excavation and support of roadway.https://doi.org/10.1038/s41598-025-03710-4Fully mechanized caving gob-side coal roadwayNarrow coal pillarPre-grouting systemCoal pillar leakage slurryCoal pillar plugging |
| spellingShingle | Dongdong Chen Zhixuan Zhang Shuaishuai Yue Chunyang Tian Qingbo Jia Shengrong Xie Wenkang Zhao Jingchen Chang Xiangyu Yang Fuxing Xie Hao Pan Grouting failure mechanism and new pre-grouting reinforcement technology of narrow coal pillar in fully-mechanized caving gob-side entry Scientific Reports Fully mechanized caving gob-side coal roadway Narrow coal pillar Pre-grouting system Coal pillar leakage slurry Coal pillar plugging |
| title | Grouting failure mechanism and new pre-grouting reinforcement technology of narrow coal pillar in fully-mechanized caving gob-side entry |
| title_full | Grouting failure mechanism and new pre-grouting reinforcement technology of narrow coal pillar in fully-mechanized caving gob-side entry |
| title_fullStr | Grouting failure mechanism and new pre-grouting reinforcement technology of narrow coal pillar in fully-mechanized caving gob-side entry |
| title_full_unstemmed | Grouting failure mechanism and new pre-grouting reinforcement technology of narrow coal pillar in fully-mechanized caving gob-side entry |
| title_short | Grouting failure mechanism and new pre-grouting reinforcement technology of narrow coal pillar in fully-mechanized caving gob-side entry |
| title_sort | grouting failure mechanism and new pre grouting reinforcement technology of narrow coal pillar in fully mechanized caving gob side entry |
| topic | Fully mechanized caving gob-side coal roadway Narrow coal pillar Pre-grouting system Coal pillar leakage slurry Coal pillar plugging |
| url | https://doi.org/10.1038/s41598-025-03710-4 |
| work_keys_str_mv | AT dongdongchen groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT zhixuanzhang groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT shuaishuaiyue groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT chunyangtian groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT qingbojia groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT shengrongxie groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT wenkangzhao groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT jingchenchang groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT xiangyuyang groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT fuxingxie groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry AT haopan groutingfailuremechanismandnewpregroutingreinforcementtechnologyofnarrowcoalpillarinfullymechanizedcavinggobsideentry |