FLAC在放顶煤开采顶煤变形与移动特征研究中的应用

采用数值模拟的方法,着重研究了顶煤的变形特征、顶煤变形与支承压力和支架工作阻力的关系;分析了采高和支架对顶煤应力和位移分布的影响,为顶煤破碎机理的分析和顶煤移动和运动规律的研究提供了依据。结果表明,支承压力有一形成过程,它对顶煤及夹矸的移动、破碎有着十分重要的影响;支架仅对下位2～3m的顶煤有影响;夹矸层的厚度及物理力学性质对顶煤的应力分布和移动有重要影响;采高的变化对顶煤的应力分布基本无影响,但会引起中下位顶煤水平位移和垂直位移的增加,对上位顶煤影响不明显。图5,表1,参8。

The numerical analysis on the stress distribution and the displacement of the top coal in sublevel caving mining

By means of numerical analysis,it is studied that the deformation characteristic of top coal,abutment pressure and supporting resistance front abutment pressure relation of deformation characteristic. Mining high and support have influence on stress and displacement distribute of top coal, which offer the basic law of mechanical for top coal broken analysis and movement. Result indicate that abutment pressure has a forming process, which has an important influence on the movement and brokenness of top coal and rock parting. Support only have influence on the top coal next 2-3m. The thickness and physics mechanics nature of rock parting have important influence on the stress distribute and its movement of top coal. The transformation of mining high has no influence on the stress of top coal , but it cause the increment of horizontal and vertical displacement in midst and low top coal, but it has no evident influence on the upside top coal. 5figs. ,1tab. ,8refs.