摘要
为获得含瓦斯水合物煤体在不同围压和饱和度下的应力-应变特征,利用自主研发的水合固化反应-三轴压缩一体化装置,通过高饱和度下含瓦斯水合物煤体的三轴压缩实验,对所得到的偏应力-应变曲线进行拟合。结果表明:含瓦斯水合物煤体在高饱和度条件下,偏应力-轴向应变曲线均呈应变软化型;含瓦斯水合物煤体的峰值强度均随围压和饱和度的增大而增大;复合幂-指数模型可以较好地描述含瓦斯水合物煤体强度随围压和饱和度变化的趋势及残余强度;采用修正的邓肯-张模型更能准确反映含瓦斯水合物煤体偏应力-应变曲线的弹性模量和峰值强度。该研究可为瓦斯水合防突技术研究提供理论参考。
This paper is meant to obtain the stress-strain characteristics behind the gashydrate-bearing coal under different confining pressures and saturations.The process involves running Triaxial compression tests on hydrate-bearing coal with high saturations using self-developed integrated apparatus for hydrate formation and triaxial compression;and fitting of the relationship between deviatoric stress-strain curves by employing the composite power exponential model(CPE model)and modified Duncan-Chang model.The results show that,given hydrate-bearing coals subjected to high saturation,the curves of deviatoric stress and axial strain are of strain softening type;the peak strength increases with an increasing confining pressure and saturation;CPE model enables a better depiction of the variation trends of the strength with the confining pressure and saturation,and the residual stress;and the modified Duncan Chang model allows for a more accurate reflection of the elastic modulus and peak strength of Deviatoric stress-strain curve of gas hydrate coal.The research could provide a theoretical reference for the research of gas hydrate outburst prevention technology.
作者
高霞
王维亮
张保勇
Gao Xia;Wang Weiliang;Zhang Baoyong(School of Architecture & Civil Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China;School of Safety Engineering, Heilongjiang University of Science & Technology, Harbin 150022, China)
出处
《黑龙江科技大学学报》
CAS
2020年第4期366-372,共7页
Journal of Heilongjiang University of Science And Technology
基金
国家自然科学基金项目(51974112)
黑龙江省普通本科高等学校青年创新人才培养计划项目(UNPYSCT-2017138)。
关键词
饱和度
含瓦斯水合物煤体
偏应力-应变曲线
复合幂-指数模型
修正的邓肯-张模型
saturation degree
gas hydrate-bearing coal
deviatoric stress-strain curves
composite power exponential model
modified Duncan-Chang model
