摘要
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。
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.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2016年第5期1458-1466,共9页
Rock and Soil Mechanics
基金
国家自然科学基金青年科学基金项目(No.41402306)
广西自然科学基金重点项目(No.2014GXNSFDA118034)
广西科学研究与技术开发计划项目(桂科攻14251011)~~
关键词
回采顺序
采场结构体
可移动性
结构体解构
块体理论
stoping sequence
structure bodies in stope
mobility
structure deconstruction
block theory
