晶体类型对含瓦斯水合物煤体力学性质的影响

Effect of hydrate crystal type on mechanical properties of gas hydrate-bearing coal

含瓦斯水合物煤体的力学性质研究,是利用水合原理防治煤与瓦斯突出的基础。以型煤试件为研究对象,利用自主研制融合瓦斯水合固化反应和三轴压缩荷载作用于一体试验装置,合成了含不同晶体类型瓦斯水合物煤体。对含不同晶体类型瓦斯水合物煤体和含瓦斯煤体进行了三轴压缩试验,获得了2种围压下含瓦斯水合物煤体和含瓦斯煤的应力-应变关系、强度等特性。基于莫尔-库伦强度准则进行拟合,得到含水合物煤体和含瓦斯煤体的黏聚力和内摩擦角。研究结果表明,煤体含水合物能够提高刚度和黏聚力,含II型瓦斯水合物煤体抵抗破坏能力更强,煤体含水合物的类型对煤体力学性质有不同的影响。

The mechanical properties of coal body containing gas hydrates is the basis for preventing coal and gas outburst utilizing hydration mechanism.The gas hydrate-bearing coal with different crystal types were performed,using self-developed equipment integrating gas hydrate formation and triaxial compression.Each stress-strain relations,strength and other characteristics were obtained by the triaxial compression tests on coal containing gas and containing different types of gas hydrate crystals.By fitting based on the Mohr-Kulun strength criterion,the cohesion,the angle of internal friction of coal bearing hydrate and coal bearing gas were got.The results show that,hydrate can enhance the stiffness and cohesion of coal body,and the coal containing II type gas hydrate is stronger to resistance destruction ability,and the types of hydrate in coal body have different affect for the mechanical properties of coal body.