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注浆是破碎围岩稳定性控制的重要技术手段，为填补传统水泥基注浆材料脆性大、变形适应差、易开裂失效的缺陷，引入改性稻壳纤维（Rice Husk Fiber，RHF）制备新型增韧水泥基注浆材料。通过开展浆液流动性测试和结石体无侧限抗压强度、抗折强度等试验，分析RHF掺入对水泥基注浆材料工程特性的影响，确定最优掺量，并结合傅里叶红外光谱与扫描电子显微镜等微观表征手段，探究RHF的增韧机理。结果表明：随RHF掺量增加，浆液流动度、析水率和抗压强度逐渐下降，初凝与终凝时间延长，抗折强度呈先增后减趋势；试样轴向应变增大，峰后残余强度提高，压缩破坏由脆性劈裂破坏向延性破坏转变，弯曲断裂裂缝由脆性弯曲裂缝演化为延性弯剪裂缝，材料变形协调能力增强。RHF掺量为3‰时，材料韧性最优。RHF与水泥基体结合紧密，在裂缝扩展过程中发挥桥接、拔出及断裂耗能作用，抑制裂缝发展，提高材料变形与吸能能力，实现水泥基注浆材料韧性提升。
Abstract：Grouting is a vital technique for controlling the stability of fractured surrounding rock. To address the limitations of traditional cement-based grouting materials—such as high brittleness， poor deformation adaptability， and susceptibility to cracking and failure—a novel toughened cement-based grouting material has been developed by incorporating modified Rice Husk Fiber (RHF)， which underwent treatment through crushing， acid boiling， alkali soaking， and surface coating. We conducted slurry fluidity tests and experiments on the unconfined compressive strength， flexural strength， and static elastic modulus of the hardened specimens to determine the slurry’s setting time， flowability， and bleeding rate. By analyzing the stress-strain curves and failure modes of the samples， we investigated the influence and toughening effect of RHF incorporation on the engineering properties of cement-based grouting materials to identify the optimal fiber content. Furthermore， microstructural characterization techniques such as Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) were employed to elucidate the toughening mechanism of RHF within the cement matrix. The results indicate that: (1) As RHF content increases， the slurry's flowability， bleeding rate， and compressive strength gradually decrease， while the initial and final setting times are prolonged. The flexural strength initially increases before decreasing. Notably， the axial strain of the specimens rises， post-peak residual strength improves， the compressive failure mode transitions from columnar brittle splitting to ductile shear failure， and flexural cracks evolve from brittle bending cracks to ductile bending–shear cracks， demonstrating enhanced deformation compatibility of the material. The optimum toughness is achieved at an RHF content of 3‰. (2) RHF forms an effective bond with the cement matrix through interfacial friction， adhesion， and interlocking effects， providing bridging， pull-out， and fracture resistance. This inhibits crack development， enhances the deformation capacity and energy absorption characteristics of the material， and leads to improved toughness in cement-based grouting materials. These research findings provide a scientific basis for optimizing grouting reinforcement materials for fractured surrounding rock and ensuring engineering safety.
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基本信息:
DOI：10.13637/j.issn.1009-6094.2025.1805
中图分类号:TU578
引用信息:
[1]张建俊,韩健,孙闯,等.改性稻壳纤维增韧水泥基注浆材料工程特性试验研究[J].安全与环境学报().DOI:10.13637/j.issn.1009-6094.2025.1805.
基金信息:
辽宁省重点项目（JYTZD2023077）
2026-08-07
2026-08-07
2026-08-07