复杂应力状态下的饱和体本构模型及内力变化  

Constitutive relation for saturated soft rock with complex stresses and the stress redistribution

作　　者：周飞平[1] 刘光廷[1] 李鹏辉[1] 

机构地区：[1]清华大学水利水电工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2003年第11期1576-1579,1584,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家教育振兴计划资助项目

摘　　要：水的力学作用和化学物理作用的交错影响,使得坝基软岩软化和受力更为复杂,也使一般固体线弹性本构模型不再适用。该文介绍了饱和体抗拉试验,对试验结果进行拟合,用试验验证了本构曲线受拉区的合理性。构建了复杂应力状态下饱和体本构模型,实现了复杂应力饱和体计算的有限元算法,并验证了算法的可行性和收敛性。根据新构建的本构模型和算法,给出了相应的三维有限元计算程序,其计算算例的结果验证了本构模型的合理性和算法的正确性。Due to the pore water's mechanical and chemical-physical effects, the soft rock in dam foundations is softened and its stress relationships become more complex than described by the normal linear elastic constitutive relation. A new constitutive relation was developed and validated experimentally. The constitutive relation was then added to an FEM algorithm developed for saturated materials with complex stresses. The convergence of the algorithm with the relation was than proved. Calculated results show that the constitutive relation is reasonable.

关 键 词：复杂应力 饱和体 本构模型 岩石性质 测定 软岩 孔隙水 

分 类 号：TV223.31[水利工程—水工结构工程]