摘要
含瓦斯煤体的应力-应变本构模型是煤岩工程领域研究的一个重要课题.结合不同含水率与围压下的含瓦斯煤体应力-应变曲线发展特点,采用邓肯-张双曲线模型、指数模型以及修正的邓肯-张模型对含瓦斯煤体常规三轴压缩试验的应力-应变曲线进行了拟合,并从强度与变形特征角度展开了对比分析.研究结果表明:相对于邓肯-张模型及指数模型而言,修正的邓肯-张模型能更好地反映含瓦斯煤体强度随围压与饱和度变化的规律,破坏强度理论值与实测值的相对误差都在5%以内;模型切线模量理论值虽较实测值偏低,但作为材料变形参数设计值是偏安全的.
The stress-strain constitutive model of coal containing gas is an important subject in the field of coal and rock engineering. Combined with the development characteristics of the stress-strain curve of the coal containing gas under different water content and confining pressure, the Duncan-Chang hyperbolic model, the exponential model and the modified Duncan-Chang model are used to stress the conventional triaxial compression test of the coal containing gas.The strain curves were fitted and compared from the perspective of strength and deformation characteristics. The results show that the modified Duncan-Chang model can better reflect the variation of the coal containing gas strength with confining pressure and saturation than the Duncan-Chang model and the exponential model. And the fitting relative error between the theoretical value and the measured value is within 5%. Although the theoretical value of tangent modulus for the modified Duncan-Chang model is lower than the measured value, it is safe to be used as the design value of material deformation parameters.
作者
裴权
高霞
PEI Quan;GAO Xia(School of Architectural Engineering,Heilongjiang University of Science of Technology,Harbin,Heilongjiang 150022,China)
出处
《湖南城市学院学报（自然科学版）》
CAS
2019年第5期17-21,共5页
Journal of Hunan City University:Natural Science
关键词
含瓦斯煤体
三轴压缩
邓肯-张模型
指数模型
coal containing gas
triaxial compression test
Duncan-Chang model
exponential model
