Geomechanics and Engineering

  • 제30권2호
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  • Pages.153-167
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  • 2022
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  • 2005-307X(pISSN)
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  • 2092-6219(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Simulation study on porosity disturbance of ultra-large-diameter jet borehole excavation based on water jet coal wetting and softening model

  • Guo, Yan L. (School of Management, China University of Mining and Technology(Beijing)) ;
  • Liu, Hai B. (School of Management, China University of Mining and Technology(Beijing)) ;
  • Chen, Jian (College of Mining Engineering, North China University of Science and Technology) ;
  • Guo, Li W. (College of Mining Engineering, North China University of Science and Technology) ;
  • Li, Hao M. (College of Engineering, Huazhong Agricultural University)
  • 투고 : 2021.06.21
  • 심사 : 2022.06.07
  • 발행 : 2022.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

This study proposes a method to analyze the distribution of coal porosity disturbances after the excavation of ultra-large-diameter water jet boreholes using a coal wetting and softening model. The high-pressure jet is regarded as a short-term high-pressure water injection process. The water injection range is the coal softening range. The time when the reference point of the borehole wall is shocked by the high-pressure water column is equivalent to the time of high-pressure water injection of the coal wall. The influence of roadway excavation with support and borehole diameter on the ultra-large-diameter jet drilling excavation is also studied. The coal core around the borehole is used to measure the gas permeability for determining the porosity disturbance distribution of the coal in the sampling plane to verify the correctness of the simulation results. Results show that the excavation borehole is beneficial to the expansion of the roadway excavation disturbance, and the expansion distance of the roadway excavation disturbance has a quadratic relationship with the borehole diameter. Wetting and softening of the coal around the borehole wall will promote the uniform distribution of the overall porosity disturbance and reduce the amplitude of disturbance fluctuations.

키워드

과제정보

This study was supported by the Central Guidance on Local Science and Technolog Development Fund of Hebei Province (226Z4601G), National Natural Science Foundation of China (52174182), Hebei Province Key R&D Program (21376202D), Natural Science Foundation of Hebei Province (E2020209074).

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