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Abstract In north mining area of Guanzhuangdong Mine，in which the sublevel caving was used，although the buildings are beyond the ground subsidence influence criteria，there has been widespread evidence of deformation of land surface far away from the mining area. Combining with analysis of north mining area of Guanzhuangdong Mine analysis，laws and characteristics of rock mass displacement and deformation caused by the deep mining of iron ore in soft rock strata are given. Both observed and theoretical analysis show that the subsidence of overburden layer is characterized by uniform and entire compression，displacement and deformation. And the surface deformation is continual and slow with a long duration of movement due to deep mining of iron ore in soft rock strata.
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Received: 19 May 2009
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