期刊
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
卷 115, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2021.104053
关键词
Coal mine; Roadway support; Tunnel boring machine; Discrete element method; Rockbolt; In-situ monitoring
资金
- National Natural Science Foundation of China [51804006, 51874005]
- Fund of State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines [SKLMRDPC20ZZ04]
- Fund of Anhui Province Key Laboratory of Building Structure and Underground Engineering [KLBSUE202002]
This study investigated the excavation disturbance behaviors and support design of TBM-excavated roadway in an underground coal mine. By comparing two different support schemes through numerical simulation and monitoring, it was found that installing rockbolts perpendicularly to rock surface can better satisfy the requirements of TBM tunnelling in weak grounds of coal mine roadways.
There is an increasing number of TBMs applied in coal mine roadway excavation projects due to the higher safety, faster tunnelling speed and fewer labor works. Nevertheless, the experiences gained from TBM tunnelling projects of transportation or water conveyance tunnels are not well applicable in underground coal mines because of their special engineering and geological conditions. This paper proposed a case study of the excavation disturbance behaviors and support design of TBM-excavated roadway in Zhangji coal mine in Anhui Province, China. Mechanical properties of roadway surrounding rocks were obtained based on parameters of intact rocks and Rock Quality Designation (RQD) values of rock masses. The Universal Discrete Element Code (UDEC) software was used to establish numerical model of the roadway and micro-parameters are also calibrated. The excavation disturbance behaviors of unsupported roadway were firstly simulated. Moreover, the excavation disturbance behaviors and rockbolts loading characters under two different support schemes were studied and compared based on simulation and monitoring results. In this case, simulation results are in good agreement with monitoring results. Research results and experiences obtained from the working site suggest that installing rockbolts perpendicularly to rock surface can better satisfy the requirements of TBM tunnelling in weak grounds of coal mine roadways.
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