玄武岩纤维-水泥协同固化煅烧高岭土三轴试验研究  

Triaxial test study on synergistic solidified of calcined kaolin by basalt fiber-cement

作　　者：陈浩 陈亚伟 王东星[2] CHEN Hao;CHEN Ya-wei;WANG Dong-xing(CRCC Harbour&Channel Engineering Bureau Group General Contracting Company,Zhuhai,Guangdong 519000,China;School of Civil Engineering,Wuhan University,Wuhan,Hubei 430072,China)

机构地区：[1]中国铁建港航局集团有限公司总承包分公司,广东珠海519000 [2]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《中国港湾建设》2025年第3期43-51,共9页China Harbour Engineering

基　　金：国家自然科学基金项目(52079098);湖北省自然科学基金计划杰出青年项目(2024AFA051)。

摘　　要：采用水泥固化土的方法,在水泥土中掺入加筋纤维能进一步改善土体工程特性,故而研究纤维-水泥协同固化作用有助于探索全新土体改良技术。通过开展三轴固结不排水试验,依次明确纤维-水泥协同增效过程中多种影响因素的作用规律,论证纤维加筋-水泥水化协同固化土的作用机理。结果表明:水泥的掺入会导致土体试样发生脆性破坏;玄武岩纤维掺入与增大围压水平效能类似,均会导致试样发生塑性破坏;纤维和水泥的掺入诱使固化土应力-应变关系由应变硬化型转变为应变软化型;随着水泥掺量、纤维掺量与纤维长度中任一因素增大,试样抗剪强度均表现为先增大后减小,发现最佳水泥掺量为6%、最佳纤维掺量为0.3%、最佳纤维长度为3 mm;随着纤维掺量的增加,黏聚力c先增大后减小,摩擦角φ变化不稳定;随着纤维长度增加,c、φ值均不断减小。基于上述研究可知:纤维加筋和水泥水化联合构建网状密实增强型骨架结构是纤维-水泥协同固化技术的微观驱动机制。Using methods of cement-solidified soil,and the incorporation of reinforced fiber into cement-solidified soil canfurther improve the soil engineering properties,so the investigation on the synergistic effect of fiber-cement solidificationcontributes to explore the novel soil improvement technology.By performing undrained triaxial consolidation tests,the rule ofeach influencing factor in the synergistic effect of fiber-cement were clarified,the mechanism of synergistic action could berevealed.The test results demonstrate that cement addition can promote the brittle failure of soil.The effect of adding basaltfiber is similar to that of increasing confining pressure level,both of which can lead to plastic failure of the specimen.After theincorporation of fiber into cement,the stress-strain relationship of solidified soil changes from strain hardening to strainsoftening.With the increase of cement content,fiber content and fiber length,the shear strength of samples firstly enlarges andthen decrease,and the optimum cement content of 6%,optimum fiber content of 0.3% and optimum fiber length of 3 mm can beidentified.As the fiber content keeps rising,the cohesion c grows and then reduces,while the friction angle φ varies unstably.With the increase of fiber length,the cohesion c and friction angle φ decrease continuously.Based on the above study,thereinforced fiber and cement hydration that build the densely reinforced network structure can be identified as the synergisticmicro-mechanism of fiber-cement combined solidification technique.

关 键 词：玄武岩纤维 水泥土 三轴试验 抗剪强度 协同作用 

分 类 号：U615.4[交通运输工程—船舶及航道工程] TU447[交通运输工程—船舶与海洋工程]