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| Monitoring and analysis of surrounding rock deformation of roadway in structural fractured zone of subsidence column |
| Qin Yong1, Zhang Fan2, Qiu Zengyao3 |
| 1. Changcun Mine, Shanxi Lu’an Environmental Protection Energy Development Corporation Ltd., Changzhi 046204, China; 2. Xima Mine, Shenyang Coking Coal Corporation Ltd., Dengta 110000, China; 3. School of Safety Engineering, North China Institute of Science and Technology,Beijing 101601,China |
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Abstract In order to analyze the supporting effect of anchor-mesh-cable in the collapse column structural fractured zone of No. 2 air return roadway in 470 South wing, the field measurement method was adopted. Firstly, the mechanical parameters of surrounding rock of roadway were tested and analyzed. Secondly, the monitoring scheme of monitoring station was designed. It could be concluded that with time of roadway mining, the roadway gradually stabilized, the deformation rate gradually decreased, and the roadway tended to stabilize after 28 d, when the roadway was in stable state after roadway mining, the roof and floor approaching amount obtained by No.1 station was about 263 mm, the two sides approaching amount was about 240 mm, the roof and floor approaching amount of No.2 station was about 341 mm, and the two sides approaching amount was stable at 342 mm. It can be seen that the deformation of roadway surrounding rock in collapse column stage was larger than that in complete stage, but the deformation was not very different.
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