某矿山Ⅲ号矿体采空区安全性评价

Safety evaluation of the goaf in the third ore body of a certain mine

为保证某矿山Ⅲ号矿体+138m中段部分残留矿柱回采工作的顺利进行,需对采空区的安全性进行评价。通过对+138m中段采空区进行实地调查并取样试验,获得了采空区和矿柱的空间分布形态及矿岩力学参数。在此基础上,利用有限差分软件FLAC3D及经典力学理论对采空区顶板及采场预留间柱的稳定性进行分析。结果表明,+138m中段采空区总体上处于较稳定状态,除局部区域安全度略有不足之外,其他区域整体上安全度较高,因此在合理的回采方案下回收部分残留矿柱是安全可行的。

For successful recovery of parts of the remaining pillar in 138 m level of the third ore body in a certain mine ,a scientific and reasonable evaluation of the goaf safety is needed .T he spatial distribu‐tion and rock mechanics of the goaf and the pillar were obtained by means of field surveying and tes‐ting .On this basis ,the finite difference software FLAC3D and the theory of classical mechanics were employed to analyze the stability of the roof and the rib pillar .The results show that the goaf in 138 m level is stable on the w hole and highly secure except some local regions ,w hich means that it is fea‐sible to recycle the remaining pillar partially under a reasonable recycling program .