基于保护层开采条件下煤层变形破坏特征,采用RFPA2D-flow数值模拟软件,对被保护煤层的应力分布特征、煤层透气性变化规律和煤层变形量进行了数值模拟分析;同时对潘三矿近水平煤层进行下保护层开采试验研究,考察了保护层开采保护边界范围的卸压增透效果。结果表明,保护层开采后,过渡卸压区内煤体膨胀率为1.85%,煤层透气性系数可增大到原来的70倍。结合瓦斯抽采可以使保护层在走向方向和倾斜方向的有效保护卸压角从原来的锐角扩展到90°,使被保护煤层的卸压范围得到扩大。

With the study on the deformation failure features of the seam under the condition of the mining in a protective seam, the boundary of the mining influen ce scope in the protective seam was determined.The RFPA2D-flow numerical simulation software was applied to the study on the stress distribution features of the prot ective seam, the variation law of the seam permeability and the seam deformation law.And an experiment study on the mining in the protective seam was conducted in t he horizontal seam of Pansan Mine.The results showed that after the mining in the protective seam conducted, the min deformation rate of the coal within the transition al pressure released zone was increased to 1.85% and the permeability coefficient of the seam was increased by 70 times.The gas drainage could make the effective pr otected pressure released angle in the strike direction and inclined direction of the seam expand from the original acute angle to 90° right angle and the pressure-relaxe d range of protected seam could be expanded.

国家自然科学基金资助项目(50874005)；