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| SURFACE DEFORMATION IN WEST AREA OF CHENGCHAO IRON MINE INDUCED BY UNDERGROUND MINING |
| XIA Kaizong1，LIU Xiumin1，CHEN Congxin1，FU Hua1，ZHANG Haina2，ZHANG Jianjun3，WU Yanmei3 |
(1. State Key Laboratory of Geomechanics and Geolechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. School of Resources and Environmental Engineering，Wuhan University of Technology, Wuhan，Hubei 430070，China；3. Chengchao Iron Ore Mine of Wuhan Iron and Steel Group Corporation，
Ezhou，Hubei 436000，China) |
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Abstract The measured data of the surface deformation including the horizontal and vertical displacements in the west part of Chengchao iron mine over the period of 6 years were collected and analyzed. The contours，moving line and collapsing line were expanded the most in the northeast area of the iron mine from the initial time of surface subsidence up to now. In January 2010，the displacements of rock mass at a road in mining area，at the surface of the fines yard and at the surface in the southeast of the transportation tunnel were found to accelerate. The reason was that horizontal stress in mines was greatly released，especially in the northeast of the mine. In the mine road and fines yard，bending fracture plane was formed in deep rock mass，and now it entered the stage of toppling-sliding to golf along the high and steep dip angle of tension cracks，with the surface deformation increasing rapidly，while in southeast area of transport tunnel，only certain bedding deformation occurred in deep rock mass. After a shorter but rapid phase of increasing，the deformation became increasing linearly and steadily，and the rock mass there is entering into a stage of toppling failure. The research results may be applied to the similar metal mines for reference.
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Received: 25 December 2013
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2014, Vol. 33 
