CAJ | 학술논문

研究了武汉地区高压缩性黏土弹塑性本构模型.基于DuncanE～v双曲线模型,对等压固结条件下CTC应力路径三轴实验数据进行了数据拟合,得到了该条件下的非线性应力应变关系,并将卸载一再加载试验曲线的平均斜率作为卸载模量,引入了加卸载函数作为判定加卸载的准则.将该模型嵌入有限元程序对三轴压缩试验进行数值模拟,并与Duncan模型数值解及试验曲线作对比.结果表明,该模型较Duncan模型能更好的体现正常固结黏土在CTC路径下的应力应变关系,特别是加载后期的应变强化效应,与试验曲线的最大相对误差不超过5%.
연구료무한지구고압축성점토탄소성본구모형.기우DuncanE～v쌍곡선모형,대등압고결조건하CTC응력로경삼축실험수거진행료수거의합,득도료해조건하적비선성응력응변관계,병장사재일재가재시험곡선적평균사솔작위사재모량,인입료가사재함수작위판정가사재적준칙.장해모형감입유한원정서대삼축압축시험진행수치모의,병여Duncan모형수치해급시험곡선작대비.결과표명,해모형교Duncan모형능경호적체현정상고결점토재CTC로경하적응력응변관계,특별시가재후기적응변강화효응,여시험곡선적최대상대오차불초과5%.
The elasto-plastic constitutive relation of high compressibility clay in Wuhan was investigated.On the basis of the framework of Duncan E～υ model, an elasto-plastic constitutive model was derived by fitting the data of triaxial compression tests under CTC stress path on isotropic consolidation condition. With the average slope of unload-reload curves as unload modulus, the loading-unloading function was introduced as the loading-unloading criterion. Moreover, the comparison was made among the stress-strain relation curve simulated by the proposed model and those with Duncan model and test curve. It was shown that the proposed model was more reasonable, which can reflect the stress-strain relation of normally consolidated soils under CTC path. Especially, the model can reflect the strain strengthening effect. The maximum relative error was no more than 5%.