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Abstract In Xiaoguanzhuang iron mine，although the towers are outside the influential area of the conventional traveling angle，and only negligible vertical deformation has been observed as a result of mining，there has been widespread evidence of regional horizontal deformation of the land surface with large distances away from the mining area. Possible explanations of these movements include one or a combination of mechanisms such as pre-mining stress relaxation，regional joint patterns，movement toward active goaf areas. A case study of the regional horizontal displacements measured during mining and the possible explanations for these phenomena are presented. The causes of the displacement and the deformation of the shaft are analyzed. It is shown that the damage of the shaft relates to not only the size of the protective ore column but also the engineering geological condition，physico-mechanical properties of rock mass，horizontal stress field，hydrogeological effects and mining method.
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Received: 26 August 2008
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