为研究膨胀岩的本构关系及其参数，选取南水北调中线工程新乡段泥灰岩和黏土岩 2 种代表性的膨胀岩，进行了三轴饱和固结排水剪切试验。通过邓肯非线性弹性模型，即 E- μ模型与 E-B 模型，对膨胀岩本构关系进行参数计算及曲线拟合对比，评价不同本构模型在膨胀岩本构关系研究中的优劣及适用性；并对新乡膨胀岩提出科学的本构参数推荐值，为该地区膨胀岩渠坡或类似的膨胀岩工程施工设计提供基本依据。

For the research of constitutive relationship and parameters of expansive rock, two typical expansive rocks, namely marl and clay rock, Xinxiang section of the Mid  route of South-to-North Water Transfer Project are selected to perform the triaxial consolidation-drainage tests. Through the non-linear elastic models of Duncan, namely the E- μ and E-B models, the parameters calculation and curve matching comparison are conducted for the constitutive relationship of expansive rock, and the relative merits and suitability of different constitutive models are evaluated in the research of the constitutive relationship of expansive rock. Meanwhile, the recommendatory value of constitutive parameters is also proposed for the expansive rock of Xinxiang, and a basic reference is provided for the design and construction of canal slope of similar projects in expansive rocks of this district.