考虑扰动的饱和软黏土球形孔扩张弹塑性解  

ELASTO-PLASTIC SOLUTION OF SPHERICAL CAVITY EXPANSION CONSIDERING DISTURBED SATURATED SOFT CLAY

作　　者：徐书平[1] 刘祖德[2] 司马军[2] 

机构地区：[1]武汉工业学院土木工程系,湖北武汉430023 [2]武汉大学土木建筑工程学院,湖北武汉430072

出　　处：《岩石力学与工程学报》2006年第z1期3212-3217,共6页Chinese Journal of Rock Mechanics and Engineering

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.

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 

分 类 号：TU43[建筑科学—岩土工程]