纤维及土工布对加固砂土抗液化性能的影响研究  

Research on the Influence of Fiber and Geotextile on the Liquefaction Resistance of Reinforced Sand

作　　者：高斌宁 Gao Binning(Central Expressway Branch of Shanxi Transportation Holdings Group Co.,Ltd.,Taiyuan 030001,China)

机构地区：[1]山西交通控股集团有限公司中部高速公路分公司,太原市030001

出　　处：《北方交通》2024年第10期75-78,共4页Northern Communications

摘　　要：为了研究纤维及土工布等加固材料对饱和砂土抗液化性能的影响,采用应变控制条件下的不排水动三轴试验,制备了加固后的饱和砂土试样,分析不同循环剪应变幅值、纤维含量和土工布层数对加固效果的影响。研究结果表明,随着循环剪应变幅值的增大,超孔隙水压累积速度显著加快,同时平均有效应力的衰减速度也加快,导致饱和砂土抗液化能力显著降低;超孔隙水压的累积速度随着纤维含量的增加而显著减缓,表明掺入纤维对饱和砂土抗液化的增强效果显著;纤维含量为0.3%的砂土的液化时间相比含量为0时延缓77.3%;随着土工布层数增加,超孔压累积速率、有效应力衰减速率下降,砂土抗液化及抗剪切性能提升。In order to study the influence of reinforcement materials such as fiber and geotextile on the liquefaction resistance of saturated sand,the reinforced saturated sand samples are prepared by using the undrained dynamic triaxial test under the strain control condition,and the influence of different cyclic shear strain amplitudes,fiber content and geotextile layers on the reinforcement effect is analyzed.The research results show that,with the increase of the amplitude of cyclic shear strain,the accumulation rate of excess pore water pressure is significantly accelerated,and meanwhile the attenuation rate of average effective stress is also accelerated,resulting in the significant decrease in the liquefaction resistance of saturated sand.The accumulation rate of excess pore water pressure slows down significantly with the increase of fiber content,indicating that the incorporation of fiber has a significant effect on the liquefaction resistance of saturated sand.The liquefaction time of sand with 0.3%fiber content is 77.3%delayed compared with that with 0 content.With the increase of the number of geotextile layers,the accumulation rate of excess pore pressure and the effective stress attenuation rate decrease,and the liquefaction resistance and shear resistance of sand are improved.

关 键 词：砂土加固 纤维 土工布 抗液化 

分 类 号：U414[交通运输工程—道路与铁道工程]