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

作　　者：李庆文 李莹 曾杏钢 徐康康 张向东[2] LI Qingwen;LI Ying;ZENG Xinggang;XU Kangkang;ZHANG Xiangdong(School of Civil and Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,China;School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工业大学土木建筑工程学院,辽宁锦州121001 [2]辽宁工程技术大学土木工程学院,辽宁阜新123000

出　　处：《煤矿安全》2024年第8期133-145,共13页Safety in Coal Mines

基　　金：辽宁省自然科学基金面上资助项目(2023-MS-298);辽宁省教育厅基本科研面上资助项目(JYTMS20230866);辽宁省博士科研启动基金资助项目(2019-BS-120)。

摘　　要：为探究碳纤维增强聚合物(CFRP)布约束煤圆柱的尺寸效应规律,利用三维PFC-FLAC构建碳纤维增强聚合物(CFRP)布约束煤圆柱细观模型。通过已有试验数据验证了该模型的有效性,并在此基础上开展0、1、2、3层CFRP布对不同尺寸(50、100、150 mm)煤圆柱尺寸效应的研究;得到了不同层数(L)下抗压强度演化规律的函数关系,以及不同层数下弹性模量演化规律的函数关系;并建立了CFRP布约束煤圆柱的修正Richart强度分析模型。结果表明:在CFRP布层数一定时,不同尺寸CFRP布约束煤圆柱的抗压强度,具有明显的尺寸效应,CFRP布约束煤圆柱的相对峰值强度增强比,随尺寸的增大而增大;直径50 mm煤圆柱随CFRP层数增加弹性模量逐渐增大,直径100、150 mm煤圆柱在0≤L≤3层弹性模量先增加后减小,具有明显的层效应规律;裂隙累积量随CFRP层数的增加而增大。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 modulus 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 cylinders 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 diameter 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 

分 类 号：TD31[矿业工程—矿井建设]