考虑状态含水率和密度的膨胀土膨胀模型试验研究

以邯郸强膨胀土为研究对象，通过室内K0应力状态膨胀试验，研究了膨胀土的膨胀率与压实度、初始含水率、上覆荷载之间的关系，进而建立了考虑上述3种影响因素的膨胀率公式。同时，建立了终了含水率与初始含水率、压实度、上覆荷载之间的关系，从而得到了膨胀土线膨胀系数表达式。利用提出的膨胀模型可以得出任一含水率状态下膨胀土的膨胀本构关系。该试验操作简单，模型表达式简洁，具有较强的实用性，可为膨胀土工程的设计施工提供理论依据和参考

Experimental study of expansion model of expansive soil considering state water content and density

The relationships between compactness, initial water content, cover load and expansion rate have been studied through expansion experiments at the state of K0 stress for Handan strong expansive soil. Then a constitutive model of expansive soil which considered the effects of these three factors is set up. The relationship between ultimate water content, compactness, initial water content and cover load is also set up. Finally, a constitutive equation for linear expansion coefficient of Handan strong expansive soil is proposed. It takes compactness, initial water content, cover load and ultimate water content as variables. With this constitutive equation, constitutive relation of any water content can be obtained. The experiments and expression of this model are relatively simple and of certain practical use. This model can provide theoretical basis and reference for design and construction.