矿业科学学报2025，Vol.10Issue(5)：867-878,12.DOI:10.19606/j.cnki.jmst.2025092
不同接触模型与饱和度下含瓦斯水合物煤体细观力学性质研究
Mesoscopic mechanical properties of gas hydrate-bearing coal under different contact models and saturations
摘要
Abstract
Conventional triaxial compression tests were conducted on gas hydrate-bearing coal(GHBC)with three different saturation levels.Three-dimensional DEM numerical simulations were established based on the anti-rolling model and the parallel bond model respectively,to investigate the influence of saturation and particle shape on the deviatoric stress-strain curves,average coordination number,veloc-ity field,and contact force chains of GHBC.The results indicate that:(1)At saturation levels of 40％,60％,and 80％,the peak strengths are 14.86,16.18,and 16.16 MPa respectively,with an increase of 8.7％.The peak strength initially increases with rising saturation but subsequently stabili-zes.(2)The anti-rolling contact model demonstrates error rates within 6％for both elastic modulus and peak strength,while the parallel bond model exhibits errors up to 9％.This indicates that both models can characterize the mechanical properties of gas hydrate-bearing coal,although the anti-rolling contact model yields superior accuracy.(3)With increasing saturation,both the initial and final coordination numbers of the specimens increase;the average coordination numbers during loading exhibit distinct patterns between the two sample types;no clear trend emerges in the velocity field evolution;internal contact forces consistently decrease;while peak strength and elastic modulus improve.These changes collectively enhance the mechanical properties of GHBC.(4)Compared to the parallel bond model specimens,the anti-rolling effect enhances effective contacts between particles.This results in force chains that are more numerous and uniformly distributed,primarily forming axial columnar structures,leading to a more stable configuration.关键词
含瓦斯水合物煤体/常规三轴试验/饱和度/平行黏结模型/抗滚动模型/离散元Key words
gas hydrate-bearing coal/conventional triaxial test/saturation/parallel bond model/anti-rolling model/discrete elements model分类
矿山工程引用本文复制引用
高霞,张国庆,李春雨,殷振元,张保勇,王楠楠,吴强..不同接触模型与饱和度下含瓦斯水合物煤体细观力学性质研究[J].矿业科学学报,2025,10(5):867-878,12.基金项目
国家自然基金联合基金(U21A20111) （U21A20111）
国家自然科学基金(51974112,51674108) （51974112,51674108）
