朱昌星, 齐忠华, 吴大志,.碳纤维增韧注浆体试块宏细观力学性能研究[J].河南理工大学学报（自然科学版）,2025,44(5):161-170.

ZHU C X, QI Z H, WU D Z.Study on macroscopic and mesoscopic mechanical properties of carbon fiber-toughened grouting consolidation bodies[J].Journal of Henan Polytechnic University(Natural Science) ,2025,44(5):161-170.

碳纤维增韧注浆体试块宏细观力学性能研究

朱昌星, 齐忠华, 吴大志

河南理工大学 土木工程学院，河南 焦作 454000

摘要: 目的 为研究碳纤维（carbon fiber，CF）在注浆固结体试块（grouting consolidation body，GCB）内的增韧阻裂作用，开展碳纤维增韧注浆体试块宏细观力学性能研究。  方法 结合室内试验和数值模拟试验，分别对0%，0.5%，1.0%，1.5% CF掺量的GCB进行三点弯曲试验，并结合电镜扫描试验（SEM）探究CF的增韧阻裂性能；通过0%CF，1.0%CF掺量的GCB三点弯曲数值模拟试验， 多尺度（细观-宏观）、多角度研究GCB中CF增韧阻裂机理。  结果 CF掺量与抗拉强度呈先增后减的变化趋势，1.0%CF-GCB抗拉强度、韧性指数及断裂韧性性能更优；CF在基体内失效模式为脱黏破坏、拉伸破坏及剪切破坏，拉伸破坏面光滑平整，剪切破坏面为45°斜截面。GCB室内试验与模拟试验的破坏模式、应力-应变曲线基本一致；1.0%CF-GCB抗拉强度高达5.54 MPa，较0%CF提高18%；依据PFC2D模拟结果将裂纹数量和抗拉强度曲线分为裂纹萌生阶段、裂纹继续发展阶段和峰后阶段，得出模型底部CF受力大于中上部的，随机分布的CF和砂砾影响裂纹扩展路径，裂纹沿水泥颗粒间粘结薄弱的地方扩展。  结论 研究成果可为后续深入研究CF增韧阻裂机理提供参考依据。

关键词:碳纤维;注浆固结体;增韧阻裂;数值模拟

DOI:10.16186/j.cnki.1673-9787.2023120007

基金项目:国家自然科学基金资助项目（51874119）；河南省教育厅基金资助项目（2011A440003）；河南理工大学博士基金资助项目（B2009-96）

收稿日期:2023/12/05

修回日期:2024/02/22

出版日期:2025/07/23

Study on macroscopic and mesoscopic mechanical properties of carbon fiber-toughened grouting consolidation bodies

Zhu Changxing, Qi Zhonghua, Wu Dazhi

School of Civil Engineering， Henan Polytechnic University， Jiaozuo 454000， Henan， China

Abstract: Objectives This study aims to investigate the toughening and crack-resistance effects of carbon fiber （CF） in grouting consolidation bodies （GCBs）. Methods Three-point bending tests were performed on GCBs containing 0%， 0.5%， 1.0%， and 1.5% CF. Scanning electron microscopy （SEM） was used to analyze the toughening and crack-resistance mechanisms of CF at the microscale. Additionally， numerical simulations of three-point bending tests were conducted on GCBs with 0% and 1.0% CF to study the toughening and crack-resistance behavior from mesoscopic and macroscopic scales.  Results The 1.0% CF–reinforced GCB exhibited the highest tensile strength， toughness index， and energy dissipation capacity. The failure modes of CF within the matrix included debonding failure， tensile failure， and shear failure. The tensile failure surfaces were smooth and flat， while shear failure surfaces were inclined at approximately 45°. The failure mode and stress-strain curves obtained from laboratory tests and simulations were in good agreement. The tensile strength of the 1.0% CF-GCB reached 5.54 MPa， representing an 18% increase over the 0% CF sample. Conclusions The stress borne by CF at the bottom of the model was higher than that in the middle and upper parts. Randomly distributed carbon fibers and gravel influenced crack propagation paths. These findings provide a reference for further investigation of the toughening and crack resistance mechanisms of carbon fiber.

Key words:carbon fiber;grouting consolidation body;toughening;crack resistancenumerical simulation