煤矿安全2024，Vol.55Issue(8)：133-145,13.DOI:10.13347/j.cnki.mkaq.20230701
不同尺寸下CFRP约束煤圆柱细观模拟研究
Mesoscopic simulation of coal cylinders confined by CFRP with different sizes
摘要
Abstract
In order to study the size effect law of carbon fiber reinforced polymer(CFRP)constrained coal cylinders,a numerical model of coal circular confined by carbon fiber reinforced polymer(CFRP)sheet is established by a three-dimensional PFC-FLAC coupling method.The validity of the model was verified with experimental data.On this basis,the study of the size effect of 0,1,2 and 3 layers of CFRP sheet on different sizes(50 mm,100 mm,150 mm)of coal cylinders were studied;the functional relationship of the evolution law of compressive strength under different layer number(L)is obtained;the functional relationship of elastic modu-lus evolution under different number of layers is obtained;a modified Richart strength analysis model of coal cylinder confined by CFRP sheet is established.The results show that when the number of CFRP sheets is constant,the compressive strength of coal cyl-inders is constrained by different sizes of CFRP sheets,and the size effect is obvious;the relative peak strength enhancement ratio of coal cylinder constrained by CFRP sheet increases with the increase of the size.The elastic modulus of a coal cylinder with a diamet-er of 50 mm increases with the number of CFRP layers.The elastic modulus of a coal cylinder with a diameter of 100 mm and 150 mm increases first and then decreases at 0≤L≤3 layers,showing an obvious layer effect law.The accumulation of cracks increases with the increase of the number of CFRP layers.关键词
尺寸效应/煤圆柱/碳纤维增强聚合物/强度模型/单轴压缩Key words
size effect/coal cylinders/carbon fiber reinforced polymer(CFRP)/strength model/uniaxial compression分类
矿业与冶金引用本文复制引用
李庆文,李莹,曾杏钢,徐康康,张向东..不同尺寸下CFRP约束煤圆柱细观模拟研究[J].煤矿安全,2024,55(8):133-145,13.基金项目
辽宁省自然科学基金面上资助项目(2023-MS-298) （2023-MS-298）
辽宁省教育厅基本科研面上资助项目(JYTMS20230866) （JYTMS20230866）
辽宁省博士科研启动基金资助项目(2019-BS-120) （2019-BS-120）
