CAJ | 학술논문

为更好地反映原状K_0固结软土的变形特性,在已建立的考虑软土初始诱发各向异性的弹黏塑性模型基础上,进一步研究软土的旋转硬化规律.通过分析土体在等向固结过程中的黏塑性体积变化,推导表征黏土各向异性演化速率的旋转硬化参数b的理论表达式,便于实际应用.针对浙江温州原状软黏土进行三轴不排水压缩和拉伸剪切试验,分析K_0固结温州软黏土的应变率效应以及旋转硬化规律对其受力变形性状的影响.对比分析试验结果与模型计算结果,验证模型及旋转硬化规律的有效性和适用性.
위경호지반영원상K_0고결연토적변형특성,재이건립적고필연토초시유발각향이성적탄점소성모형기출상,진일보연구연토적선전경화규률.통과분석토체재등향고결과정중적점소성체적변화,추도표정점토각향이성연화속솔적선전경화삼수b적이론표체식,편우실제응용.침대절강온주원상연점토진행삼축불배수압축화랍신전절시험,분석K_0고결온주연점토적응변솔효응이급선전경화규률대기수력변형성상적영향.대비분석시험결과여모형계산결과,험증모형급선전경화규률적유효성화괄용성.
Based on the proposed anisotropic elastoviscoplastic constitutive model for K_0-consolidated clays,a suitable rotational hardening law accounting for changes in anisotropy due to viscoplastic strains is adopted. The expression of the rotation parameter b is presented by analyzing the soil's volumetric changes during isotropic loading. Series of triaxial undrained compression and extension tests have been carried out on the natural K_0-consolidated Wenzhou soft clay. Followed by comparison between the predicted results and the experimental data,the proposed model with rotational hardening law is capable of capturing key features of viscoplastic behaviors of soft soil,and the importance and applicability of rotational hardening law is indicated and verified.