围压对含瓦斯水合物煤体应力应变关系的影响  

Effect of confining pressure on stress-strain relationship of gas hydrate-bearing coal

作　　者：张保勇[1,2] 高橙 高霞[2,3] 刘文新[1,2] 吴强[1,2] 张强[1,2] 

机构地区：[1]黑龙江科技大学安全工程学院,哈尔滨150022 [2]黑龙江科技大学瓦斯等烃气输运管网安全基础研究国家级专业中心实验室,哈尔滨150022 [3]黑龙江科技大学建筑工程学院,哈尔滨150022

出　　处：《黑龙江科技大学学报》2015年第2期137-142,共6页Journal of Heilongjiang University of Science And Technology

基　　金：国家自然科学基金重点项目(51334005);国家自然科学基金项目(51104062;51174264;51274267;51404102)

摘　　要：力学性质是基于水合原理预防煤与瓦斯突出的核心问题之一。以具有突出倾向煤体制备的型煤为研究对象,利用自主研发的瓦斯水合物生成与三轴压缩一体化装置,开展了围压影响下含瓦斯水合物煤体三轴压缩实验。结果表明:三种围压下,应力-应变曲线均为软化型;不同特征点(初始屈服点、峰值点及残余阶段)含瓦斯水合物煤体的黏聚力相差较大,而内摩擦角的变化较小;含瓦斯水合物煤体的初始屈服强度、峰值强度、残余强度和变形模量随着围压的增加呈线性关系增加,围压对含瓦斯水合物煤体的力学性质有所强化。This paper is focused on a study based on the deeper realization that the mechanical be- havior holds the key to coal and gas outburst prevention based on hydrate method. The study is directed at experiments on the briquette specimens prepared from outburst coal body and triaxial compression tests of gas hydrate bearing coal exposed to different confining pressure using the integrated apparatus for gas hydrate formation and triaxial compression. The experimental results demonstrate that, when exposed to three different confining pressures, the stress-strain curves exhibit the strain softening behavior; gas hy- drate bearing coal has a major difference in cohesion when it comes to the initial yielding point, peak point and the residual stage, but shows no obvious variation in internal friction angle; gas hydrate bearing coal tends to have a linear increase in the initial yielding strength, peak strength, residual strength and the deformation modulus due to an increase in the confining pressure, pointing to the strengthening effect of the confining pressure on the mechanical properties of gas hydrate bearing coal.

关 键 词：煤与瓦斯突出 含瓦斯水合物煤体 三轴压缩实验 力学性质 应力应变关系 

分 类 号：TD712[矿业工程—矿井通风与安全]