摘要
为了解含瓦斯水合物煤体的力学特性,利用自主研发的低温高压水合固化反应-三轴压缩一体化装置,开展了2种高饱和度条件下含瓦斯水合物煤体的三轴压缩试验。结果表明:1)含瓦斯水合物煤体的应力-应变曲线均呈软化型,分为峰前线弹性阶段和强化段、峰后应力软化段和残余变形段四个阶段;2)含瓦斯水合物煤体的初始屈服强度、峰值强度、残余强度随饱和度增加而增大,且随围压增加而线性增加;3)饱和度相同时,含瓦斯水合物煤体在初始屈服点、峰值强度点和残余强度的内摩擦角变化不大,而黏聚力则出现先增大后减小的趋势;4)含瓦斯水合物煤体呈现拉剪破坏以及单面剪切破坏2种破坏模式。
This paper presents an experimental investigation on the mechanical behavior of gas hy- drate-bearing coal with two different high saturations by using the self-developed integrated apparatus of triaxial compression and gas hydrate formation under low temperature and high pressure. The ex- perimental results show that： 1） the stress-strain curves of the gas hydrate-bearing coal are the strain softening branches including four stages： the linear elastic stage, the hardening stage, the softening stage and the residual stage; 2） the sample with a high saturation has higher initial yield strength, peak strength and the residual strength, which linearly increase as increasing the confining pressure; 3） the internal friction angle has small variations among the initial yield point, peak point and residual point, while the cohesion firstly increases then decreases; 4） the coal samples are destroyed by the ten- sion-shear or the single shear.
作者
张保勇
高橙
高霞
刘文新
吴强
张强
ZHANG Baoyong1, GAO Cheng1, GAO Xia1＇2, LIU Wenxin1, WU Qiang1, ZHANG Qiang1(1. School of Safety Engineering, National Professional Center Lab of Safety Basic Research for Hydrocarbon Gas Pipeline Transportation Network, Heilongjiang University of Science ＆ Technology, Harbin, Heilongjiang 150022, China; 2. School of Architecture and Civil Engineering, Heilongjiang University of Science ＆ Technology, Harbin, Heilongjiang 150022, Chin)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2018年第2期429-435,共7页
Journal of Mining & Safety Engineering
基金
国家自然基金重点项目(51334005)
国家自然科学基金项目(51674108,51774123,51274267,51704103)
关键词
煤与瓦斯突出
含水合物煤体
三轴试验
力学性质
饱和度
coal and gas outburst
gas hydrate bearing coal
triaxial compression test
mechanicalbehavior
saturation degree
