粉煤灰与剑麻纤维复合对膨胀土物理力学特性的影响研究  

Effect of Fly Ash and Sisal Fiber on Physical and Mechanical Properties of Expansive Soil

作　　者：张保伟 ZHANG Baowei(CNOOC Shandong Chemical Engineering Co.,Ltd.,Jinan Shandong 250101,China)

机构地区：[1]中海油石化工程有限公司,山东济南250101

出　　处：《当代化工》2024年第12期2827-2830,共4页Contemporary Chemical Industry

基　　金：国家自然科学基金青年科学基金项目(项目编号:52108212);陕西延长石油延安能源化工有限责任公司科技项目(项目编号:KJFZ-07-2022)。

摘　　要：为了分析复掺粉煤灰和剑麻纤维对膨胀土膨胀率和力学特性的影响变化规律,制备了不同粉煤灰和剑麻纤维复合掺量的膨胀土样品,开展了自由膨胀率、无侧限抗压强度、劈裂抗拉和直剪实验,分析了无荷膨胀率、单轴抗压强度、劈裂抗拉强度、内聚力、内摩擦角随粉煤灰和剑麻纤维复合掺量的变化规律。结果表明:膨胀土的无荷膨胀率随着粉煤灰和剑麻纤维复合掺量的增大而减小;掺加粉煤灰与剑麻纤维对膨胀土的抗压性能、抗拉性能和抗剪性能具有明显的提升作用;随着粉煤灰与剑麻纤维复合掺量的提高,膨胀土的内聚力和内摩擦角将逐渐变大,但增大幅度相对越来越小,当粉煤灰与剑麻纤维总掺量保持不变时,随着剑麻纤维占比的提高,膨胀土的黏聚力逐渐增大而内摩擦角则基本保持不变;最佳的粉煤灰与剑麻纤维复合质量比为30,复合后两者在膨胀土中的总掺量不宜超过12%。In order to analyze the effect of fly ash and sisal fiber on the expansion rate and mechanical properties of expansive soil,samples of expansive soil with different composite content of fly ash and sisal fiber were prepared,and tests of free expansion rate,unconfined compression,splitting tensile and direct shear were carried out.The changes of unloaded expansion rate,uniaxial compressive strength,splitting tensile strength,cohesion and internal friction angle with the mixture amount of fly ash and sisal fiber were analyzed.The results showed that,the load-free expansion rate of expansive soil decreased with the increase of the composite content of fly ash and sisal fiber;the addition of fly ash and sisal fiber could significantly improve the compressive,tensile and shear properties of expansive soil;with the increase of fly ash and sisal fiber composite content,the cohesive force and internal friction angle of expansive soil gradually became larger but the increase was relatively smaller;when the total content of fly ash and sisal fiber remained unchanged,with the increase of the proportion of sisal fiber,the cohesion of expansive soil gradually increased and the internal friction angle basically remained unchanged;the optimal composite mass ratio of fly ash and sisal fiber was 30,and the total content of the two in expansive soil after composite should not exceed 12%.

关 键 词：粉煤灰 剑麻纤维 膨胀土 力学特性 

分 类 号：TQ171.77[化学工程—玻璃工业]