关键词: 点柱法, 分层充填, 动态地压, 数值分析, 地压规律

Abstract: Based on the characteristics of point pillar slice stoping and backfilling method of Liguanji iron ore，the variation of stress including pointed pillar，barrier pillar，filling body，and upper and lower sides wall rock has been monitored and analyzed under the actual mining and filling process of mine.With the consideration of the preferred planes，a rock mass structure model has been constructed by the (3 Dimension Distinct Element Code) 3DEC numerical simulation software.In addition，combined with the actual monitoring and the numerical simulation，and the match with the ground pressure，the pressure variation regularity in the progress of pillar slice stoping and backfilling method was analyzed.Results show that：①At the beginning of mining，the upper loading is supported by the pillars together with the host rock.With the increase of excavation height，the stress is transformed from the point pillar to host rock.The upper stress was mainly supported by the host rock;②The stress in the hanging side and heading side changed alternately with the mining：the stress in excavation layer increased，the stress in backfill layer recovered，and the stress in disturbance layer released.The ground pressure presents as the layered transformation rule in the same pillar and is cycled with the excavation mining.

Key words: Pillar stoping method, Slicing backfilling method, Dynamic ground pressure, Numerical analysis, Ground pressure regularity