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采场范围内存在的结构体严重影响地下矿山安全生产,分析不同回采顺序下采场结构体可移动性具有重要意义。以块体理论为基础,结合空场法开采的采场空间属性,分析了结构体在采场内的一般嵌套模式。运用General Block程序建立了采场结构体模型,对采场内结构体的类型、体积和位置等元素进行了解构。利用矢量方法分析了不同回采顺序下采场结构体可移动性,并利用力学方法分析了考虑岩桥破坏时的矢量不可动结构体的回采移动性,推导了结构体破坏岩桥移动的条件公式。以铜坑矿锌多金属矿体1#矿块采场为样本,进行了回采可移动性实例分析,结果表明:一端至另一端后退回采时,4个结构体滑动;中间至两端后退回采时,7个结构体滑动,1个结构体破坏岩桥后滑动;上向水平分层回采时,4个结构体滑动,2个结构体掉落。研究成果可为地下矿山裂隙矿岩空场法回采顺序的合理选择及采场安全管理提供技术指导。
The structures existing in the stope range have a serious impact on the safety of underground mines. It is of great significance to analyze the mobility of stope structures under different mining sequences. Based on the block theory, combined with the space property of stope mining by the empty field method, the general nested pattern of the structure in stope is analyzed. The General Block program is used to establish the stope structure model, and the deconstruction of the elements, such as the type, size and position of the structure in the stope. The mobility of stope structure under different mining sequence was analyzed by vector method, and the mining mobility of the unmovable structure with rock mass destruction was analyzed by mechanics method. . Taking Tongkeng ore zinc polymetallic ore body 1 # ore block as a sample, a case study on the mobility of mining was carried out. The results show that the four structures slide when the one end to the other end are withdrawn and the structures slide backwards; When seven structural bodies slide and one structural body destroys the rock bridge, four structural bodies slide and the two structural bodies fall when stratified to horizontal mining. The research results can provide technical guidance for the reasonable choice of back-mining sequence of open-pit fractured ore rock and safety management of stope.