土工格栅与土工格室加筋土的大型直剪试验和邓肯-张模型参数研究

基于梅河高速公路程江至华城段K20 638及K20 500处桥台加筋土台背处理方案,采用大尺寸直剪模型试验分析了土工格栅、土工格室加筋土以及土工格室加筋水泥稳定土接触面上的剪切变形特性,其剪应力-剪切应变曲线呈明显的非线性关系,采用邓肯-张双曲线模型能很好地反映土体的非线性特征,通过试验得到了土工格栅、土工格室加筋土界面的邓肯-张E-B模型参数,为今后土工格栅、格室加筋土桥台设计提供参考。

Research on Large Size Direct Shear Test between Geogrid and Geocell Reinforced Soil and Parameters of Duncan-Chang Model

Based on the abutment back treatment schemes of reinforced soil which lies at K20 638 and K20 500 between Chengjiang and Huacheng section on Meihe expressway,the experimental research of the shearing distortion properties on the interfaces of geogrid,geocell reinforced soil and geocell reinforced cement stabilized soil was carried out by using a large size direct shear model test.Its shear stress-strain curve exists non-linear relationship obviously,so it could reflect the non-linear characteristics exactly when Duncan-Chang curve model is adopted.Duncan-Chang E-B model parameters of reinforced soil interfaces of geocell and geogrid are obtained through conducting abundant experiments.It provides the references for designing reinforced soil bridge abutment of geogrid and geocell.