不同纤维对土体力学特性的影响及机理分析  

Effect of Different Fibers on Soil Mechanical Properties and Mechanism Analysis

作　　者：牛雷 吴占君 徐丽娜[2] 毕苏红 黄占芳[3] NIU Lei;WU Zhan-jun;XU Li-na;BI Su-hong;HUANG Zhan-fang(School of Civil Engineering,Jilin Jianzhu University,Changchun 130118,China;School of Transportation Science and Engineering,Jilin Jianzhu University,Changchun 130118,China;School of Civil Engineering and Geomatics,Shandong University of Technology,Zibo 255049,China)

机构地区：[1]吉林建筑大学土木工程学院,长春130118 [2]吉林建筑大学交通科学与工程学院,长春130118 [3]山东理工大学建筑工程与空间信息学院,山东淄博255049

出　　处：《长江科学院院报》2024年第11期144-150,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(52008185);吉林省科技厅重点研发项目(20220203063SF)。

摘　　要：为了探究不同纤维对土体加固效果的影响,将玄武岩纤维和玻璃纤维分别加入同一种土中,通过无侧限抗压强度试验,对比分析2种纤维加筋土的应力-应变曲线、强度随纤维掺量和纤维长度变化的关系;通过双根纤维锚固试验,分析纤维增强土体强度的作用机理。试验结果表明:纤维加筋土的抗压强度明显大于素土的抗压强度;随纤维长度的增加,玄武岩纤维和玻璃纤维加筋土的强度均呈现先增大后减小的趋势,纤维的最优长度均为9 mm;随着纤维掺量的增加,2种纤维加筋土强度呈现波浪式变化,存在2个峰值,纤维的最优掺量均为0.5%。通过纤维锚固试验,发现双根纤维的拉拔力随纤维间距的变化而变化,当间距较小时,纤维之间存在耦合影响,拉拔力存在峰值和谷值,随着纤维间距的增大,当达到临界锚固间距后,纤维之间互不影响。To investigate how different fibers influence soil reinforcement,basalt fiber and glass fiber were separately added to the same soil.Unconfined compressive strength tests were performed to compare the stress-strain curves and analyze the relationship between strength and both fiber content and fiber length for the two types of fiber-reinforced soil.Additionally,fiber anchorage test was conducted to explore the mechanisms of fibers enhancing soil strength.The results demonstrate that fiber-reinforced soil exhibits significantly greater compressive strength compared to plain soil.As fiber length increases,the strength of both basalt and glass fiber-reinforced soils first rises and then falls,with the optimal fiber length being 9 mm.Similarly,increasing fiber content causes the strength of both types of fiber-reinforced soil to fluctuate,with two peaks observed;the optimal fiber content is 0.5%.The fiber anchorage tests reveal that the pull-out force of the fibers varies with changes in fiber spacing.At small spacings,fibers interact,resulting in peak and valley values of pull-out force.As fiber spacing increases and reaches a critical anchorage distance,fibers no longer affect each other.

关 键 词：玄武岩纤维 玻璃纤维 纤维加筋土 无侧限抗压强度 纤维锚固 

分 类 号：TU411.6[建筑科学—岩土工程]