波形纤维对砂质黏性紫色土力学性能的影响  

Effect of wave-shape fiber on mechanical properties of sandy clayey purple soil

作　　者：杨莉莉 谢春燕[1] 石浩廷 潘建勋 吴达科[1] YANG Lili;XIE Chunyan;SHI Haoting;PAN Jianxun;WU Dake(College of Engineering and Technology,Southwest University,Chongqing 400700,China)

机构地区：[1]西南大学工程技术学院,重庆400700

出　　处：《人民长江》2020年第4期191-195,共5页Yangtze River

基　　金：重庆市科委社会事业与民生保障科技创新专项(一般)项目(cstc2016shmszx80001);中央高校基金科研业务费项目(XDJK2018C038)。

摘　　要：加筋土目前已被广泛运用在加固软土地基、边坡、挡土墙等工程中,其中纤维加筋土作为一种新型复合材料,因其具备相对均质的、近似各向同性的性质而备受关注。为研究波形聚丙烯纤维对砂质黏性紫色土力学性能的影响,通过控制纤维含量(0.2%,0.3%,0.4%)、长度(20,30,40 mm)两个因素进行无侧限压缩和三轴压缩试验。结果表明:随着波形纤维含量的增加,加筋土无侧限抗压强度呈现先增大后减小的趋势,在纤维掺量为0.3%时,无侧限抗压强度和残余强度均达到最大值;纤维长度对加筋土无侧限抗压强度也有影响,纤维长度大于20 mm时,会提高无侧限抗压强度,但同时也会削弱破坏韧性;随着纤维含量和长度的增加,试样的凝聚力升高、内摩擦角降低。Reinforced soil has been widely used in strengthening soft soil foundation,slope,retaining wall and other projects,in which fiber reinforced soil,as a new composite material,has attracted much attention because of its relatively homogeneous and approximately isotropic properties.In order to study the influence of wave-shape polypropylene fiber on the mechanical properties of sandy clayey purple soil,the unconfined compression and triaxial compression test were carried out by controlling the fiber content(0.2%,0.3%,0.4%)and length(20,30,40 mm).The test results showed that the unconfined compressive strength of reinforced soil increased first and then decreased with the increase of wave-shape fiber content,and the unconfined compressive strength and residual strength reached the maximum when the fiber content was 0.3%.Fiber length had an effect on the unconfined compressive strength of reinforced soil.When the fiber length was greater than 20 mm,it would increase the unconfined compressive strength,but at the same time,it would also weaken the failure toughness.With the increase of fiber content and length,the cohesion of the sample increased and the internal friction angle decreased.

关 键 词：砂质黏性紫色土 波形聚丙烯纤维 无侧限抗压强度 三轴压缩试验 力学性能 

分 类 号：TU411[建筑科学—岩土工程]