朱昌星,齐忠华,吴大志.碳纤维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)，doi:10.16186/j.cnki.1673-9787.2023120007.

ZHU C X, QI Z H, WU D Z. Study on macro and micro mechanical properties of carbon fiber grouting test block[J].Journal of Henan Polytechnic University(Natural Science Edition ),doi:10.16186/j.cnki.1673-9787.2023120007.

碳纤维增韧注浆体试块宏细观力学性能研究(网络首发)

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，方法 分别对0%、0.5%、1%、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%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 1%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粘破坏、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%CF-GCB抗拉强度高达5.54MPa，较0%CF提高了18%。结论 模型底部CF受力大于中上部，随机分布的CF和砂砾影响裂纹扩展路径。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）

收稿日期：2023-12-05

修回日期：2024-02-22

网络首发日期：2024-03-05

Study on macro and meso mechanical properties of carbon fiber toughened grouting body test block

ZHU Changxing,QI Zhonghua,WU Dazhi

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

Abstract: Objective In order to study toughness and crack resistance of carbon fiber (CF) in grouting sample (GCB). Methods three-point bending tests of 0 %, 0.5 %, 1 % and 1.5 % CF sample were carried out respectively, and the toughness and crack resistance of CF were investigated by scanning electron microscopy (SEM). Based on three-point bending numerical simulation test of 0 % and 1 % CF sample, the toughness and crack resistance mechanism of CF sample were studied by from multiple scales (meso-macro) and multiple angles. Results The 1 % CF-GCB has the best tensile strength, toughness index and energy dissipation performance. The failure modes of CF in the matrix are debonding failure, tensile failure and shear failure. The tensile failure surface is smooth and flat, and shear failure surface is 45 °oblique section. The failure mode and stress-strain curve of the laboratory test and simulation test are basically the same. The tensile strength of 1 % CF-GCB is up to 5.54 MPa, which is 18 % higher than that of 0 % CF. Conclusion The CF stress of the model bottom is higher than that the middle and model upper, and randomly distributed carbon fiber and gravel affect the crack propagation path. The research results can provide a reference for the further study of the toughness and crack resistance mechanism of carbon fiber.

Key words: carbon fiber; grouting stone body; toughening crack resistance; numerical simulation