考虑温度对静止土压力K0系数影响的统一硬化本构模型OA北大核心CSTPCD

The K0 coefficient is an important geotechnical parameter.Investigating its influencing factors and change law is vital for determining ground stress states.The influence of temperature on the K0 coefficient was in-vestigated in this paper using experimental and theoretical methods.Firstly,some confined compression tests at dif-ferent temperatures were conducted on saturated mixture samples of standard sand and bentonite.The change law of the K0 coefficient with temperature was obtained,indicating that the K0 coefficient of normally consolidated soils de-creases but that of overconsolidated soils increases slightly as temperature increases.Secondly,a quantitative rela-tionship between the K0 coefficient and the inclination of the elastoplastic yield surface was derived,which was then combined with the results of the temperature-controlled confined compression test.Thus,the variation of the incli-nation of the yield surface with temperature was obtained.Finally,by introducing the relationship between the in-clination of yield surface and temperature into the theoretical framework of the unified hardening constitutive model,a new elastoplastic constitutive model for saturated clayey soils considering the temperature effect on the K0 coeffi-cient was established,which can well simulate various laboratory mechanical tests.