By similarity simulation experiment, we analysis the mining-induced fracture distribution and permeability of coal and rock mass near protective layer mined by speckle method.

• 阐述了含瓦斯煤的力学特性：通过相似模拟实验，用散斑法对保护层开采过程中来动裂隙分布规律及煤岩体的渗透性进行了分析。