Cosserat连续体的本构参数对重力坝深层抗滑稳定的影响  

The Effects of Constitutive Parameters in Cosserat Continuum Model on the Deep Anti-sliding Stability of Gravity Dams

作　　者：涂承义[1] 马刚[2] 

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,杭州311122 [2]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《中国农村水利水电》2017年第4期158-163,173,共7页China Rural Water and Hydropower

基　　金：国家自然科学基金项目(51379161;51509190)

摘　　要：基于ABAQUS的UEL自定义单元接口二次开发,采用基于有限元的强度储备系数法模拟重力坝坝基应变局部化的渐进破坏过程,分析比较Cosserat连续体模型中的本构参数Cosserat剪切模量、软化模量以及内部长度参数对结果的影响。结果表明:在一定范围内,Cosserat剪切模量对模拟结果影响不大;软化模量的取值在一定范围内,渐进破坏过程基本相同,当达到某一定值时,计算在坝基塑性屈服区未贯通时即迭代不收敛,当其绝对值进一步增大时,降低坝基抗剪断强度的过程中软弱夹层未屈服,与实际不符;内部长度参数的取值不同,对渐进破坏过程塑性屈服区的发展影响不大。Based on secondary developments with user subroutine UEL of ABAQUS, strain localization for the foundation of gravity dam is simulated by the strength reserve coefficient method based on FEM. The effects on progressive failure analysis of strain localization for the foundation of gravity dam of constitutive parameters, such as Cosserat shear modulus, softening modulus, internal length parameters are stud- ied. The results show that： the value of Cosserat shear module has little effect on the results when chosen within certain range. The softening module chosen within certain range, the progressive failure is almost the same, when it reaches a certain value, the iteration of calculation does not converge before foundation yield region through, when shearing strength of foundation reducing, the soft interlayer does not yield, which does not match the actual conditions. The internal length parameter takes different values. The development of plastic yield region in progressive failure is almost the same.

关 键 词：重力坝 应变局部化 强度储备系数法 Cosserat剪切模量 软化模量 内部长度参数 

分 类 号：TV64[水利工程—水利水电工程]