摘要
格栅加筋土在高填方工程中应用广泛,而混合填料的抗剪性能会直接影响填方工程的安全和稳定性。采用双向土工格栅为加筋材料,黏质粉土及石英砂混合物为人工填土,设计含水率、颗粒级配、压实度、加筋间距4因素3水平的L_(9)(3^(4))正交室内直剪试验,利用极差法和方差法分析各因素对抗剪强度指标的敏感性和显著性。研究结果表明,仅含水率对内摩擦角有显著影响,其它因素对黏聚力和内摩擦角都不敏感,应在碾压过程中严格控制含水率;根据综合平衡法确定最优组合方案,并测出抗剪强度指标值。对最优方案开展FLAC^(3D)数值直剪试验,分析了剪切试验过程中位移矢量及剪切面应力变化规律,揭示了加筋作用机理,为实际工程设计和施工提供了依据。
The geogrid reinforced soil is widely used in high fill engineering,and the shear resistance of mixed filler will directly affect the safety and stability of the fill engineering.The two-way geogrid is used as the reinforcement material,and the mixture of clay silt and quartz sand is used as the artificial fill.The L_(9)(3^(4))orthogonal indoor direct shear test is designed with 4 factors and 3 levels of water content,particle gradation,compactness and reinforcement spacing.The sensitivity and significance of each factor to shear strength are analyzed by range method and variance method.The results show that only the water content has a significant effect on the internal friction angle,other factors are not sensitive to cohesion and internal friction angle,the water content should be strictly controlled in the rolling process.The optimal combination scheme is determined according to the comprehensive balance method,and the shear strength index value is measured.The FLAC^(3D)numerical direct shear test is carried out for the optimal scheme,the displacement vector and the stress change law of the shear plane during the shear test are analyzed,and the reinforcement mechanism is revealed,which can provide a basis for the actual engineering design and construction.
作者
王蜜蜜
冯艺玮
吴迪
袁霄
何贵银
左双英
Wang Mimi;Feng Yiwei;Wu Di;Yuan Xiao;He Guiyin;Zuo Shuangying(College of Resource and Environmental Engineering,Guizhou University)
出处
《勘察科学技术》
2022年第5期1-7,共7页
Site Investigation Science and Technology
基金
贵州大学大学生创新创业训练计划项目(贵大(国)创字(2020)050号)
贵州省科学技术基金重点项目(黔科合基础[2020]1Z052)
