基于颗粒流软件探究不同CFRP布层数对轴压煤圆柱能量演化的影响  

Effect of CFRP Layers on the Energy Evolution of Axial Compressed Cylindrical Coal Based on Particle Flow Software

作　　者：李庆文 潘创创 张学磊 钟宇奇 李玲 聂帆帆 李雯霞 徐梦娇 LI Qingwen;PAN Chuangchuang;ZHANG Xuelei;ZHONG Yuqi;LI Ling;NIE Fanfan;LI Wenxia;XU Mengjiao(School of Civil and Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,Liaoning,China;China Building Materials Industry Geologic Exploration Center Liaoning Branch,Shenyang 110004,Liaoning,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]中国建筑材料工业地质勘查中心辽宁总队,辽宁沈阳110004

出　　处：《高压物理学报》2025年第4期89-106,共18页Chinese Journal of High Pressure Physics

基　　金：辽宁省自然科学基金(2023-MS-298,20180550297);辽宁省教育厅基本科研面上项目(JYTMS20230866);辽宁省博士科研启动基金(2019-BS-120)。

摘　　要：为探究不同碳纤维增强复合材料(carbon fiber reinforced plastic,CFRP)布层数对轴压煤圆柱力学特性及能量演化的影响,结合室内单轴压缩试验,采用有限差分-离散元法(FDM-DEM)进行数值模拟。试验结果表明,无论是未约束煤圆柱,还是CFRP约束样本,应力-应变曲线均经历了压密、弹性、屈服和峰后4个阶段。CFRP布约束样本在屈服和峰后阶段表现出明显的延性破坏,其平均峰值应力、峰值应变和弹性模量分别比未约束样本高出约2、2.5和1倍。数值模拟结果显示:随着CFRP布层数增加,峰值应变和峰值应力分别提升至733%和548%;而弹性模量并未单调上升,表明在设计CFRP布层数时需平衡强度与刚度。此外,CFRP布层数的增加导致破坏机制由张拉破坏转变为剪切破坏,表明其对煤圆柱的应力分布和破坏过程影响显著。煤圆柱的总能量和耗散能随着CFRP布层数的增加显著提升,能量吸收效率最高可达10.51倍,显示其抗失稳能力显著增强。为量化CFRP布的约束效应,引入了“等效厚度”概念,发现其随着CFRP布层数增加呈非线性增长趋势,且在6.78层时,等效厚度趋近于无穷大,说明了CFRP布在提升煤圆柱结构稳定性方面的重要性,为未来研究提供了重要参考。To investigate the effects of different layers of carbon fiber reinforced plastic(CFRP)on the mechanical properties and energy evolution of axially compressed cylindrical coal samples,the finite difference method-discrete element method(FDM-DEM)coupled numerical simulation and laboratory uniaxial compression tests are combined in this paper.The test results show that both unconfined cylindrical coal samples and CFRP-confined samples undergo four stages in the stress-strain curve,namely,compression-tightness,elasticity,yielding,and post-peak.The CFRP-confined samples show obvious ductile damage in the yielding and post-peak stages,and their average peak stresses,peak strains,and elasticity modulus are about 2,2.5 and 1 times higher than those of the unconfined samples,respectively.Numerical simulations show that the peak strain and peak stress increased to 733% and 548%,respectively,with the increase in the number of CFRP layers.The elastic modulus does not increase monotonically,indicating that a balance between strength and stiffness is required when designing the CFRP layers.In addition,the increase of CFRP layers leads to the change of the damage mechanism from tensile damage to shear damage,indicating that it has a significant effect on the stress distribution and damage process of the cylindrical coal samples.The total and dissipated energy of the cylindrical coal samples significantly increased with the increase of CFRP layers,and the energy absorption efficiency reaches up to 10.51 times,showing a significant enhancement of their destabilization resistance.To quantify the confinement effect of CFRP sheets,the concept of“equivalent thickness”is introduced.It is found that the equivalent thickness increases nonlinearly with the number of CFRP layers,and at 6.78 layers,the equivalent thickness approaches infinity,which emphasizes the importance of CFRP sheet in improving the stability of cylindrical coal sample structure,and provides an important reference for future research.

关 键 词：单轴压缩 碳纤维增强复合材料布 煤圆柱 有限差分-离散元法 能量演化 等效厚度 

分 类 号：TU45[建筑科学—岩土工程] O521.9[建筑科学—土工工程]