Investigation into the strength of iron ore pillars in the Lorraine basin
作者单位：University of the WitwatersrandSouth Africa
会议名称：《Harmonising Rock Engineering and the Environment—12th ISRM International Congress on Rock Mechanics》
会议日期：2011年
学科分类：081901[工学-采矿工程] 0819[工学-矿业工程] 08[工学]
关 键 词：risks and hazards stability analysis back analysis case studies rock failure
摘 要：正1 INTRODUCTION Iron ore mining was carried out in the Lorraine district in the north-east of France for several *** predominant mining method was bord and pillar,with pillar extraction in some *** is no evidence today that a formal design method for pillar size was in *** appear to have been sized by trial and error. Mining ceased in *** knowledge of the pillar strength is not required now for mining purposes,it is important for the evaluation of pillar stability and hence surface stability as the region has been extensively built up. The method of analysis was essentially to create data bases