岩土力学2017，Vol.38Issue(5)：1314-1320,7.DOI:10.16285/j.rsm.2017.05.011
初始剪应力对饱和粉土液化大变形特性的影响
Effect of initial static shear stress on liquefaction and large deformation behaviors of saturated silt
摘要
Abstract
Because initial static shear stress exists in a sloped ground,soil is more possible to be liquefied and largely deformed than the level ground when subjected to a strong earthquake.So it is necessary to study the effects of initial static shear stress on the liquefaction and large deformation of liquefied soil.A series of cyclic torsional shear tests examine the saturated silts.The single amplitude shear strain exceeds 50％ in the tests.The testing results show that the pore pressure of the specimens can reach the effective confining pressure under the combined effect of initial and cyclic shear stresses,namely the effective stress equals zero.Moreover,it is found that the cumulative strain increases gently during initial stage,and grows greatly later.Two types of large deformation of saturated silt can be distinguished:the cyclic liquefaction and the cumulative strain.At the same time,it is shown that,the cyclic shear strength decreases with the increasing of initial static shear stress ratio until initial static shear stress ratio reaches cyclic shear stress ratio,and starts to increase thereafter.关键词
饱和粉土液化/大变形/初始剪应力比/循环剪应力比/循环强度Key words
saturated silt liquefaction/large deformation/initial static shear stress ratio/cyclic shear stress ratio/cyclic shear strength分类
建筑与水利引用本文复制引用
周正龙,陈国兴,吴琪..初始剪应力对饱和粉土液化大变形特性的影响[J].岩土力学,2017,38(5):1314-1320,7.基金项目
国家自然科学基金项目(No.41172258,No.514380040).This work was supported by the National Natural Science Foundation of China(41172258,51438004). （No.41172258,No.514380040）
