土工格栅对粗粒料的静力强度、变形特性有一定影响,为研究能够合理描述其强度、变形特性的本构模型,本文以土工格栅加筋粗粒料室内三轴试验成果为基础,根据不同类型土工格栅加筋粗粒料的剪胀特性,以剑桥模型剪胀方程为基础提出了能够合理描述土工格栅加筋粗粒土剪胀、剪缩特性的非线性剪胀方程。在此基础上,结合广义塑性模型理论,构造了能够反映土工格栅加筋粗粒料变形和强度特性的弹塑性本构模型。模型共有6个参数,均可通过室内三轴试验确定。最后,通过模拟多组不同围压下土工格栅加筋粗粒料室内三轴试验,充分验证了模型的合理性。

Geogrid has a certain influence on the strength and deformation characteristics of coarse-grained materials. In order to investigate the constitutive model which can reasonably describe its strength and deformation characteristics, based on the conventional triaxial test results of geogrid reinforced coarse-grained materials, a nonlinear dilatancy equation is proposed in this study to reasonably describe the dilatancy and shrinkage characteristics of geogrid reinforced coarse-grained materials according to the characteristics of dilatancy of different types of geogrid reinforced coarse-grained materials. On the basis of above studies, combined with the theory of generalized plastic model, an elastoplastic constitutive model that can reflect the deformation and strength characteristics of geogrid reinforced coarse-grained materials is proposed. There are totally 6 parameters in the model, all of which can be determined by conventional triaxial test. Finally, the accuracy of the model is fully proved by simulating the static and dynamic triaxial tests on geogrid reinforced coarse-grained materials under different confining pressures.

国家重点研发课题(2021YFB2601102)；国家自然科学基金(52279096,52279125,52009017)