粗粒料湿化变形三轴试验研究

对小浪底斜心墙堆石坝的砂岩粗粒料采用单线法进行中型三轴湿化变形试验，研究了该种土料的湿化变形特性。通过对试验结果和湿化变形规律的分析，总结了湿化轴向应变、湿化体积应变与湿化应力水平、围压之间的关系。试验结果表明，湿化轴向应变与湿化应力水平呈双曲线关系，湿化轴向应变与围压呈线性关系；湿化体积应变与湿化应力水平和围压均为线性关系。根据对试验结果的分析以及计算湿化变形的单线法，提出了一个适用于计算粗粒料湿化变形的数学模型。该湿化变形模型参数共6个，并给出了通过室内常规试验确定参数的方法。对模型进行了验证，结果表明该湿化模型计算曲线与试验结果吻合较好，表明该模型能较好地反映粗粒料湿化变形的特征。

Wetting deformation of coarse grained materials in triaxial test

A number of middle-scale triaxial tests are performed to investigate the wetting deformation behavior of a coarse-grained material from the Xiaolangdi declined-core earth and rockfill dam. The test results indicate that the wetting deformation of coarse-grained materials is influenced by confining pressure and wetting stress level. There is a hyperbolic relationship between the wetting axial strain and wetting stress level. The wetting axial strain is linearly related to confining pressure. Instead, the wetting volumetric strain is linearly related to wetting stress level as well as confining pressure. Based on the above deformation regularities and single-line method, a mathematical model is proposed for predicting the wetting deformation of coarse-grained materials. There are six parameters in this model and their definitions are clear, and the method to determine parameters through the indoor tests are given. The fitting curve of the wetting model is identical with the experimental curves. The fact that the properties of coarse-grained materials can be well reflected by the proposed model proves the practical validity of the model.