Abstract: Due to the existence of structure bodies in the scope of stope, the work safety in underground mine is seriously influenced.. Hence, it is significant to analyze the mobility of structure bodies in stope under different stoping sequences. Based on the block theory, the general nesting modes of structure bodies in stope are analyzed, combined with the spatial attributes of stope mined with the open stope mining method. In this study, a stope structure model is established by using GeneralBlock code and then the elements of the structure bodies such as type, size and location are deconstructed. The structure mobility in different stope mining sequences is further analyzed by using the vector method. In addition, the mining mobility of the vector immovable structure bodies is investigated by mechanics method when rock bridge destructing and a formula for structure bodies is derived under the conditions of the bodies destroyed and rock bridge moved. The ore block No.1 of the zinc-polymetallic deposits in Tongkeng mine is selected as an example to analyze the mobility of the structure bodies under real stoping conditions. The results show that when the retreating mining sequence is from one end to the other, four structure bodies tend to slide. However, seven structure bodies tend to slide and even one structure body tends to slide after the rock bridge is destroyed, when the retreating mining sequence is from the middle to two ends. When the mining sequence is turned into hierarchical level up, four structure bodies tend to slide and two structure bodies fall in the meanwhile. Therefore, this study can provide a technical guidance for the selection of mining sequence properly and management of stope safely when cracked rocks in underground mine is mined by the open stope mining method.

Key words: stoping sequence, structure bodies in stope, mobility, structure deconstruction, block theory