摘要
在碳酸盐渍土中加入回收轮胎聚合物纤维(RTPF)可改善抗剪性能,并且使用RTPF可实现资源回收再利用,大幅降低环境负担。对于季冻区盐渍土,本文通过室内试验研究RTPF水泥改良碳酸盐渍土在冻融作用下抗剪强度损伤规律。对不同RTPF掺量水泥改良碳酸盐渍土冻融循环后进行三轴剪切试验。结果表明:RTPF改良碳酸盐渍土应力-应变曲线呈应变软化型,RTPF可提高水泥改良碳酸盐渍土的弹性模量;RTPF可使水泥改良碳酸盐渍土的破坏强度提高,1.0%(质量分数)RTPF束破坏强度提升最显著;RTPF可改善抗冻性能,RTPF束对抗冻性能提升效果更显著;掺加RTPF后改良碳酸盐渍土表现出更高的黏聚力,随着冻融循环次数增加,黏聚力逐渐下降;冻融循环次数对内摩擦角影响不明显,无显著规律;RTPF发挥桥接效应,限制微裂隙的发展,提升改良碳酸盐渍土稳定性。
Adding recycled tire polymer fiber(RTPF)to carbonated saline soil can enhance its shear performance.Additionally,the utilization of RTPF enables resource recycling and reuse while significantly reduces the environmental burden.For the saline soil in seasonally frozen regions,this study investigated the shear strength damage law of RTPF cement modified carbonated saline soil under freeze-thaw cycles through laboratory experiments.Triaxial shear tests were conducted on modified carbonated saline soil by different RTPF content after freeze-thaw cycles.The results indicate that the stress-strain curves of RTPF modified carbonated saline soil exhibit strain softening characteristics,and RTPF can improve the elastic modulus of cement modified carbonate saline soil.RTPF can enhance the breaking strength of cement modified carbonated saline soil,with the 1.0%(mass fraction)RTPF bunch is the most significant improvement.RTPF improves the frost resistance,and the effect of RTPF bunch on enhancing the frost resistance is more significant.The modified carbonated saline soil demonstrates higher cohesion after adding RTPF,and the cohesion gradually decreases with the increase number of freeze-thaw cycles.The number of freeze-thaw cycles has no obvious effect on internal friction angle,showing no clear trend.RTPF plays a bridging effect,limits the micro fracture development and enhances the stability of modified carbonated saline soil.
作者
王佳慧
王凤池
孙畅
WANG Jiahui;WANG Fengchi;SUN Chang(School of Transportation and Geomatics Engineering,Shenyang Jianzhu University,Shenyang 110168,China;School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《硅酸盐通报》
北大核心
2025年第7期2720-2729,共10页
Bulletin of the Chinese Ceramic Society
基金
辽宁省中央引导地方科技发展专项项目(2023JH6/100100018)。
关键词
碳酸盐渍土
回收轮胎聚合物纤维
三轴剪切试验
冻融循环
抗剪强度
改良机理
carbonated saline soil
recycled tire polymer fiber
triaxial shear test
freeze-thaw cycle
shear strength
improvement mechanism
