基于FLAC^3D数值模拟的底部结构稳定性研究

Research on Stability of Bottom Structure Based on FLAC^3D Numerical Simulation

底部结构的稳定性是实现矿体安全高效开采的关键。针对李楼铁矿-300m中段底部结构直接布置于-400m中段充填体上部的问题,结合现场实际情况,建立了三维模型,并采用FLAC^3D进行了数值模拟计算,对底部结构位移、应力场等变化规律进行分析。结合数值模拟分析结果对-300m中段底部结构巷道提出现有巷道充填与侧帮回填、底板补强并针对易出现应力集中的部位加强支护等修复方案,保证了采场的安全可靠性。

The bottom structure was one of the key projects to achieve safe and efficient mining of ore bodies.The bottom structure at-300 mlevel in Lilou Iron Mine was directly arranged in the upper part of the filling body at-400 mlevel.In view of this problem,a three-dimensional model was established combined with the actual situation of the site,and FLAC^3D was used for numerical simulation to analyze the displacement and stress field of the bottom structure.Based on the results of numerical simulation analysis,the restoration schemes were proposed for the bottom structure roadway at-300 mlevel,such as roadway filling,side wall backfilling,floor reinforcement,as well as srengthening support for the parts prone to stress concentration,so as to ensure the safety and reliability of the stope.