摘要
根据原位十字板试验扰动导致饱和软黏土不排水强度降低的事实,应用球形孔扩张理论,假设饱和软黏土在塑性阶段满足Tresca屈服条件,提出一种基于饱和软黏土灵敏度的扰动度函数。在考虑塑性区内不排水强度是扰动度的对数函数的基础上,得到了考虑扰动的球形孔扩张的弹塑性解答。通过与不考虑扰动的球形孔扩张理论进行对比,可发现考虑扰动后球形孔扩张的应力、超孔隙水压力明显地降低。
According to the fact that the undrained shear strength decreases during field vane test,by applying the spherical expansion theory,and assuming that the saturated soft clay satisfies the Tresca yield criterion,the disturbance degree function is proposed on the basis of the sensibility of saturated soft clay.On the basis of the undrained shear strength being the logarithm function of the disturbance degree,the elasto-plastic solution of the cylindrical expansion is obtained.By comparing with the conventional spherical cavity expansion,the total stress,effective stress and excess pore pressure with considering the disturbed spherical cavity expansion decrease apparently.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第z1期3212-3217,共6页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
饱和软黏土
球形孔扩张理论
Tresca材料
灵敏度
扰动度
对数函数
soil mechanics
saturated soft clay
spherical cavity expansion theory
Tresca material
sensibility
disturbance degree
logarithm function
