摘要
植被根系大多分布在土体浅表层,在渗流作用下能有效防止浅层滑坡和地表侵蚀。研究采用人工合成纤维加筋土模拟植被的根系作用防治边坡渗流失稳破坏。为探究聚丙烯纤维的长度对土体强度的影响以及纤维加筋边坡在渗流作用下的稳定性,制备的加筋粉砂分别参入不同含量(0.25%,0.50%)和长度(6 mm、12 mm)的聚丙烯纤维。通过室内三轴固结排水试验研究加筋粉砂的基本性质,并开展了素土边坡和加筋边坡在人工降雨条件下的室内模型试验。其中,仅对边坡的浅表层进行加筋处理。研究表明,加筋粉砂的抗剪强度和粘聚力相比普通粉砂得到明显提高,而加筋前后粉砂内摩擦角变化不大。相比于素土边坡,随着纤维长度的增加,加筋边坡的破坏速度变缓、破坏程度得到明显改善,边坡破坏由全坡破坏到坡面局部破坏再到无明显性破坏的模式。
Roots of vegetation are mostly distributed in the shallow surface of the soil,which can effectively prevent shallow landslides and surface e rosion under seepage.In this study,artificial synthetic fibers are commonly used to reinforce the soil to simulate the root function of vegetation.To study the influence of polypropylene fiber length on soil strength and the stability of reinforced slope under seepage,the prepared reinforced silty sand is mixed with different content(0.25%,0.50%)and lengths(6 mm,12 mm)polypropylene fiber.The basic properties of reinforced silty sand are studied through laboratory triaxial consolidation drainage tests,and the laboratory model tests of bare soil slope and reinforced slopes under artificial rainfall are carried out.Among them,reinforced silty sand is only distributed in the shallow surface of reinforced slope.The results show that the shear strength and cohesion of reinforced silty sand are significantly improved compared to ordinary silty sand,while the internal friction angle of silty sand before and after reinforcement does not change much.Compared with bare soil slope,the failure speed of reinforced slope slows down and the damage degree has been significantly reduced with the increase of fiber length.Slope failure mode changes from large area failure to local failure and then no obvious structural failure occurs.
作者
杨小荣
罗磊
廖志广
吴世栋
包小华
吴应雄
YANG Xiaorong;LUO Lei;LIAO Zhiguang;WU Shidong;BAO Xiaohua;WU Yingxiong(Zhuhai Shizimen Central Business District Development Holdings Co.,Ltd.Zhuhai 519000,China;College of Civil and Transportation Engineering,Shenzhen University Shenzhen 518000,China;College of Civil Engineering of Fuhou University Fuzhou 350000,China)
出处
《广东土木与建筑》
2022年第5期29-34,共6页
Guangdong Architecture Civil Engineering
基金
国家重点研发计划重点专项(2019YFC1511104)
国家自然科学基金项目(52022060)。
关键词
粉砂边坡
纤维加固
三轴试验
模型试验
降雨入渗
silty sand slope
fiber reinforced
triaxial test
model test
rainfall infiltration
