采动破碎岩体的动态碎胀性物理模拟的研究

Study of the Mining - induced Dynamic Expansion of Fractured Rock Mass through Physical Simulation

通过相似材料模拟试验,研究了长壁全采、部分开采条件下不同区域、不同高度采动破碎岩体的动态碎胀变化规律,总结出长壁全采时位于采空区边界内附近的破碎岩体碎胀系数最大,条带部分开采比长壁全采时岩体的碎胀系数小得多,部分开采时岩体的碎胀系数随高度波浪变化及在加载时煤层区域可压缩量较大的重要规律。

A study is made on the law governing the variation of the dynamic expansion of the rock mass at different heights and regions caused by mining with complete extraction （ Longwall method） or partial extraction method. It is concluded that with the use of the longwall mining system, the rock mass near the boundary inside a goaf generally has a highest magnitude of expansion coefficient, which is much larger than that in the case where a partial extraction method is used. And the expansion coefficient of the rock mass when the partial extraction system is applied tends to vary in a wave upon wave manner and the seam region will undergo a larger compressive strairi under load.