CAJ | 학술논문

研究了不同初始固结压力条件对黏土本构关系的影响.进行了2组不同固结条件下的排水压缩试验,即等压固结条件和K_0固结条件.采用数值建模方法,以ε~p和ε_v~p为硬化参数的双屈服面模型为框架,通过对试验数据空间的反演获得两种不同初始条件下的黏土弹塑性本构关系,并在整个应力场(p',q)可视化.将该数值模型嵌入有限元程序对三轴压缩试验进行数值模拟,并与试验曲线及相同路径下的剑桥模型和Duncan-Chang模型关系曲线进行对比.结果表明,数值建模方法有较好的容错性,能很好地反映应力历史的影响,能模拟真实应力路径.
연구료불동초시고결압력조건대점토본구관계적영향.진행료2조불동고결조건하적배수압축시험,즉등압고결조건화K_0고결조건.채용수치건모방법,이ε~p화ε_v~p위경화삼수적쌍굴복면모형위광가,통과대시험수거공간적반연획득량충불동초시조건하적점토탄소성본구관계,병재정개응력장(p',q)가시화.장해수치모형감입유한원정서대삼축압축시험진행수치모의,병여시험곡선급상동로경하적검교모형화Duncan-Chang모형관계곡선진행대비.결과표명,수치건모방법유교호적용착성,능흔호지반영응력역사적영향,능모의진실응력로경.
The effects of different initial stress states on the constitutive relations of clay are studied. With clay selected as test sample, two series of triaxial consolidation draining compression tests are performed under different consolidation conditions, isotropic consolidation and K_0 consolidation. Based on the tests under the two different initial consolidation conditions, the elastoplastic constitutive models which contain two yield surfaces of two relatively independent hardening parameters ε~p and ε_v~p are derived by using numerical modeling method. The three-dimensional surfaces of the stress-strain relations in the whole stress field (p', q) are drawn through visualization. Moreover, the comparisons of the stress-strain relation curves with the simulated results obtained by the numerical model, Cam-clay model, Duncan-Chang hyperbolic model and from test data are made. It is shown that the numerical modeling method is reasonable, which can reflect the effects of stress paths and stress history.