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Instability Mechanism and Control of Roadway Subjected to Severe Mining Dynamic Load with Double Roadway Layout Mining Face

  • Fu-lian He
  • Yong-qiang ZhaoEmail author
  • Fu-xing XieEmail author
  • Jun Liu
Original Paper
  • 27 Downloads

Abstract

Severe deformation and instability problem of surrounding rock was caused by multiple severe mining dynamic load for roadway. Auxiliary haulage roadway 3101 for Menkeqing mine’s first working face was taken as engineering background in this paper. Field observation, borehole observation and numerical simulation were adopted to systemically analyze deformation and failure law of surrounding rock under double roadway driving and working face mining. The results were showed as follow: (1) When the roadway was subjected to the action of double roadway driving and working face mining, the deformation of surrounding rock began to increase sharply until 350 m behind the working face, characterized by serious subsidence in roof, heavy in floor and asymmetric destruction in two ribs. The deformation of the surrounding rock tended to be stable until 550 m in the rear of the working face; (2) Low strength and poor mechanical properties of surrounding rock, multiple mining and long-term effects of high stress are main reason of the overall instability of the roadway. (3) The key to control of the surrounding rock was to improve the integrity of the surrounding rock and to strengthen the key parts (coal pillar rib and roof) of roadway. The specific measures were as follows: improving the stability of coal pillar rib and roof, avoiding the transfer of high supporting stress to the floor, strengthening surface protecting of support structure, and improving the integrity of the roadway. According to the above research, a suitable strengthening control technology of surrounding rock which included “all cross-sectional bolt-wire mesh + high strength and lengthen bolt + high pre-tightening force cable” was put forward for field engineering practice. Through numerical simulation and engineering practice, the subsidence of the roof and the asymmetric deformation of two ribs could be effectively controlled, and ensured the stability of retained roadway in the process of mining.

Keywords

Double roadway layout Multiple violent mining Deformation and inability Surrounding rock control 

Notes

Acknowledgements

The Project Supported by National Natural Science Foundation of China No. 51574243. Supported by the Yue Qi Distinguished Scholar Project (800015Z1138), China University of Mining and Technology, Beijing. Supported by ‘‘the Fundamental Research Funds for the Central Universities’’ (800015J6).

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.College of Resources and Safety EngineeringChina University of Mining and Technology (Beijing)BeijingChina
  2. 2.Beijing Key Laboratory for Precise Mining of Intergrown Energy and ResourcesChina University of Mining and Technology (Beijing)BeijingChina
  3. 3.Beijing China Coal Mine Engineering Co., Ltd.BeijingChina
  4. 4.Mine Construction Branch of Research InstituteChina Coal Research InstituteBeijingChina

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