Abstract When mining adjacent stope, backfill is used to ensure the stability of the stope, and thus the remaining pillars can be safely carried out. In the process of pillar mining, it is important to avoid the excessive exposure height of backfill. Based on the stress distribution and arching effect in backfill, the minimum cohesion required for backfill to ensure the stope stability was obtained under certain height of the pillar excavation. And the maximum critical height of pillar excavation under certain cohesion was also obtained. The results showed that neglecting the influence of shear force between backfill and surrounding rock overestimates the stability of backfill; When the backfill had the same exposure height, the safety factor increases exponentially with the increase of cohesion of the backfill. With the increase of the one-time excavation height of the pillar, the safety factor was decreased by negative exponent, the larger the cohe- 2019年 - 第1卷第2期闫保旭,等: 地下采场二步采充填体最大暴露高度理论分析 \=-sion in the backfill was, the higher the rate decreased. And when the exposed height of backfill was enough larger, the failure of backfill was mainly caused by gravity.
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