摘要
以聚丙烯纤维加筋黄土在黄土边坡坡面防护中的应用推广为研究背景,探讨了聚丙烯纤维加筋黄土的抗侵蚀性能及坡面防护效果。基于室内试验,研究了纤维长度和纤维掺量对加筋黄土抗剪强度、抗崩解性和渗透系数的影响规律,并基于试验获得的加筋黄土最佳配合比,开展降雨冲刷模型试验。结果表明:聚丙烯纤维的掺入可有效提高黄土的抗剪强度和抗崩解性,随着纤维掺量的增加和长度的增长,加筋黄土的黏聚力和崩解速率均呈现出先减小后增大的变化趋势,当纤维长度为15mm、掺量为0.5%时,加筋土的抗剪强度和抗崩解性达到最优,相比于素黄土,加筋黄土的黏聚力提升了135.3%、崩解速率降低了91.7%;纤维的掺入提升了黄土的渗透系数,聚丙烯纤维加筋黄土的饱和渗透系数随着纤维掺量的增加而增大,随着纤维长度的增大而减小;聚丙烯纤维加筋黄土的坡面防护效果明显,当边坡坡比分别为1:1.5、1:1、1:0.75时,相比于无防护边坡,其冲刷速率分别降低了90%、90.4%和87.3%,累计冲刷量分别降低了85%、85.5%和83.6%。
Based on the application and promotion of polypropylene(PP)fiber-reinforced loess in loess slope protection,the anti-erosion performance and slope protection effect of polypropylene fiber-reinforced loess were discussed.A series of laboratory experiments was conducted to study the effects of fiber length and fiber content on the shear strength,disintegration resistance,and permeability coefficient of reinforced loess.Based on the optimum mixture ratio of fiber-reinforced loess obtained by the test,the rainfall scouring model test was carried out.The results showed that the PP fiber could effectively improve the shear strength and disintegration resistance of loess.With the increase of fiber content and fiber length,the cohesion and disintegration rate of fiber-reinforced loess decreased first and then increased.When the fiber length was 15 mm and the fiber content was 0.5%,the shear strength and disintegration resistance of the fiber-reinforced loess were optimized.Compared with plain loess,the cohesion of fiber-reinforced loess increased by 135.3%and the disintegration rate decreased by 91.7%.The permeability coefficient of loess was improved by adding polypropylene fiber.The saturated permeability coefficient of PP fiber-reinforced loess increased with the increase of fiber content,but decreased with the increase of fiber length.The slope protection effect of PP fiber-reinforced loess was obvious.When the slope ratio was 1:1.5,1:1 and 1:0.75,compared with the unprotected slope,the scour rate of protected slope was reduced by 90%,90.4%and 87.3%,respectively,and the cumulative scour amount of protected slope was reduced by 85%,85.5%and 83.6%,respectively.
作者
安宁
晏长根
王亚冲
兰恒星
包含
许江波
石玉玲
孙巍锋
AN Ning;YAN Chang-gen;WANG Ya-chong;LAN Heng-xing;BAO Han;XU Jiang-bo;SHI Yu-ling;SUN Wei-feng(School of Highway,Chang’an University,Xi’an,Shaanxi 710064,China;Beijing Jianda Road and Bridge Consulting Co.,Ltd.,Beijing 100020,China;State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China;School of Geological Engineering and Geomatics,Chang’an University,Xi’an,Shaanxi 710054,China)
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2021年第2期501-510,共10页
Rock and Soil Mechanics
基金
国家自然科学基金(No.41790443,No.41927806)
关键词
黄土边坡
聚丙烯纤维
纤维加筋土
抗侵蚀性能
抗冲刷性
loess slope
polypropylene fiber
fiber-reinforced soil
anti-erosion performance
scouring resistance
