期刊论文

Structural damage effect on dynamic shear modulus of Zhanjiang clay and quantitative characterization

中文

岩土工程学报

1000-4548

2017

39

12

2149-2157

10.11779/CJGE201712001

51179186:国家自然科学基金 41372314:国家自然科学基金

本校为其他机构

湛江黏土是一种具有高结构强度的灵敏性黏土,其强度包络线在固结围压达到结构屈服应力时存在明显转折,为了考察小应变条件下该黏土的动剪切模量随围压水平演化规律,开展了原状样与重塑样在不同围压水平下的共振柱试验与三轴CU试验,探讨考虑土体结构性损伤影响的动剪切模量表征方法。结果表明,重塑土最大动剪切模量G_(max)随有效围压的变化可用Hardin公式很好表征,而原状土G_(max)随有效围压的变化呈现先增大后减小特征,其转折点对应围压大于结构屈服应力,但最大动剪切模量与不排水剪切强度比值或经孔隙比函数归一化后的最大剪切模量随有效围压变化的转折特征点与结构屈服应力相当。出现上述现象...

The Zhanjiang clay is a kind of sensitive clay with high structural strength, whose failure envelope has a significant breakpoint when the confining pressure reaches the structural yield stress. The resonant column tests and CU triaxial tests are performed on undisturbed and remoulded specimens to investigate the evolution rules of dynamic shear modulus with confining pressure under small strain, and the characterization method for dynamic shear modulus considering the structural damage effect is also discussed. The results show that the values of Gmaxof remoulded and undisturbed specimens wit...