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New Insights of Grouting in Coal Mass: From Small-Scale Experiments to Microstructures

Author

Listed:
  • Yuantian Sun

    (Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Guichen Li

    (Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Junfei Zhang

    (School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China)

  • Junbo Sun

    (School of Design and the Built Environment, Curtin University, Perth, WA 6102, Australia)

  • Jiandong Huang

    (Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, China)

  • Reza Taherdangkoo

    (Institute of Geotechnics, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 1, 09599 Freiberg, Germany)

Abstract

Pre-grouting as an effective means for improving the stability of roadways can reduce maintenance costs and maintain safety in complex mining conditions. In the Guobei coal mine in China, a cement pre-grouting technique was adopted to enhance the overall strength of soft coal mass and provide sufficient support for the roadway. However, there are very limited studies about the effect of grouting on the overall strength of coal in the laboratory. In this paper, based on the field observation of a coal-grout structure after grouting, a series of direct shear tests were conducted on coal and grouted coal specimens to quantitatively evaluate the quality improvement of grouted coal mass. The results showed that the peak and residual shear strength, cohesion, friction angle and the shear stiffness of grouted coal were significantly improved with the increase of the diameter of grout column. Linear regression models were established for predicting these mechanical parameters. In addition, three failure models associated with coal and grouted coal specimens were revealed. According to microstructure and macroscopic failure performance of specimens, the application of the proposed models and some methods for further improving the stability of grouted coal mass were suggested. The research can provide the basic evaluation and guideline for the parametric design of cement pre-grouting applications in soft coal mass.

Suggested Citation

  • Yuantian Sun & Guichen Li & Junfei Zhang & Junbo Sun & Jiandong Huang & Reza Taherdangkoo, 2021. "New Insights of Grouting in Coal Mass: From Small-Scale Experiments to Microstructures," Sustainability, MDPI, vol. 13(16), pages 1-17, August.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:16:p:9315-:d:617660
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    References listed on IDEAS

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    1. Yuantian Sun & Guichen Li & Junfei Zhang & Jiahui Xu, 2020. "Failure Mechanisms of Rheological Coal Roadway," Sustainability, MDPI, vol. 12(7), pages 1-17, April.
    2. Yuantian Sun & Guichen Li & Junfei Zhang & Deyu Qian, 2019. "Stability Control for the Rheological Roadway by a Novel High-Efficiency Jet Grouting Technique in Deep Underground Coal Mines," Sustainability, MDPI, vol. 11(22), pages 1-17, November.
    3. Houqiang Yang & Nong Zhang & Changliang Han & Changlun Sun & Guanghui Song & Yuantian Sun & Kai Sun, 2021. "Stability Control of Deep Coal Roadway under the Pressure Relief Effect of Adjacent Roadway with Large Deformation: A Case Study," Sustainability, MDPI, vol. 13(8), pages 1-14, April.
    4. Houqiang Yang & Changliang Han & Nong Zhang & Yuantian Sun & Dongjiang Pan & Changlun Sun, 2020. "Long High-Performance Sustainable Bolt Technology for the Deep Coal Roadway Roof: A Case Study," Sustainability, MDPI, vol. 12(4), pages 1-14, February.
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    Cited by:

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    2. Fan, Xin-li & Ma, Li & Sheng, You-jie & Liu, Xi-xi & Wei, Gao-ming & Liu, Shang-ming, 2023. "Experimental investigation on the characteristics of XG/GG/HPAM gel foam and prevention of coal spontaneous combustion," Energy, Elsevier, vol. 284(C).
    3. Sen Yang & Guichen Li & Ruiyang Bi & Bicheng Yao & Ruiguang Feng & Yuantian Sun, 2021. "The Stability of Roadway Groups under Rheology Coupling Mining Disturbance," Sustainability, MDPI, vol. 13(21), pages 1-18, November.
    4. Kai Chen & Kai Zhan & Fan Pang & Xiaocong Yang & Da Zhang, 2022. "R-LIO: Rotating Lidar Inertial Odometry and Mapping," Sustainability, MDPI, vol. 14(17), pages 1-18, August.
    5. Song Shi & Yichen Miao & Haikuan Wu & Zhipeng Xu & Changwu Liu, 2022. "The Stress Evolution of Adjacent Working Faces Passing through an Abandoned Roadway and the Damage Depth of the Floor," Energies, MDPI, vol. 15(16), pages 1-17, August.
    6. Xutong Zhang & Fangtian Wang & Hongfei Qu & Chao Liu & Zhe Li & Wenhua Hao, 2023. "Surrounding Rocks Deformation Mechanism and Roof Cutting-Grouting Joint Control Technology for Soft and Thick Coal Seam Roadway," Sustainability, MDPI, vol. 15(21), pages 1-23, October.

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