摘要
31-1#矿体采空区暴露面积为6000 m2,空区高度为60 m。随着空区下部矿体开采的持续进行,空区暴露高度将达100 m左右;在巨大的采空区下进行采矿作业,一旦发生空区围岩失稳,将对作业中的人员和设备带来巨大灾难。采用有限元对空区下部矿体开采过程中空区顶板围岩的应力、安全率、垂直最大位移、塑性区分布进行了模拟分析,根据模拟结果可知:随着矿房、矿柱、下部矿体开采完成后,顶板的位移和应力有所增加,安全率有所下降,塑性区进一步扩大,地压活动有进一步恶化的趋势,但空区围岩总体上趋于稳定。在空区顶板和两腰安装监测仪器对空区围岩的稳定性进行监测,监测结果和数值模拟结果具有良好的一致性。
The exposed area is 6 000 m2 and exposed height is 60 m of 31-1# mined-out area of ore body,and the exposed height would reach to 100 m with the proceed of under mine.In the process of mining activity under the large scale mined-out area,once the roof of mined-out area collapsed,a great of disaster of the shock wave caused by collapsing of enclosing rock of roof to equipment and processing personnel under mined-out area was induced.The enclosing rock stress,vertical displacement,plastic zone and safety rate of the mined-out roof were study applying with three dimensional finite elements in the process of mining activity under the large scale mined-out area,the simulation result indicate that the displacement and stress of roof is increased,safety rate is descended and plastic zone is developed in the sequent of mining room,pillar,west and east nugget finished,and the ground stress activity would more aggravate,however the total stability of enclosing rock to roof is above critical value of roof collapsing.It indicated that the monitoring result of acoustic emission and anchor stress detector which installed in roof and in the side of mined-out is similar of simulation result.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2010年第8期117-120,共4页
Journal of Wuhan University of Technology
基金
云南省科技厅节能减排科技创新工程(2008KA001)
关键词
采空区
顶板
数值分析
稳定性
mined-out area
roof
numerical analysis
stability
