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黄泛区粉砂土具有特殊性,其力学性能也为工程界所关注.本文以开封地区粉砂土为研究对象,在GDS三轴仪上通过控制不同的围压对土样进行固结不排水静三轴剪切试验,得到了土的应力随轴向应变的变化规律;通过试验数据分析和理论计算,对黄泛区饱和粉砂土的Duncan-Chang双曲线模型参数进行了系统研究.研究结果表明,土的应力随着轴向应变增加呈现递增趋势,黄泛区粉砂土的应力-应变曲线表现为应变硬化型;通过利用邓肯-张双曲线模型计算得到的黄泛区粉砂土应力-应变值,与试验测定的结果进行对比,经分析其误差在允许范围内.本文研究内容可为黄河两岸及周边地区的工程施工和设计提供参考依据.
Yellow River pan silt has its own particularity and its mechanical properties are also concerned by the engineering.In this paper, Kaifeng area silt sand as the object of study, by GDS triaxial instrument by controlling the confining pressure of different soil consolidation of the soil sample is not Drainage static triaxial shear test, the change law of soil stress with axial strain was obtained. Through the experimental data analysis and theoretical calculation, the Duncan-Chang hyperbola model parameters of the saturated sands in the flood plain area were systematically studied. The results show that the stress of soil increases with the increase of axial strain, and the stress-strain curve of silty sand in the Yellow River area shows strain hardening. By using the Duncan-Chang hyperbola model, Soil stress-strain value is compared with the result of the test, the error of the analysis is within the allowable range.The content of this paper can provide reference for engineering construction and design of both sides of the Yellow River and surrounding areas.