摘要
地下水的存在会使渗流场和应力场相互作用、相互影响。由于渗透静水压力的作用,坝体各应力分量最大值增大,也使坝体的各特征点处的应力集中现象加剧,因此从实际工程情况以及渗流对计算的影响考虑,采用流固耦合方法分析重力坝深层抗滑稳定问题很有必要性。借助有限元分析软件ABAQUS,分别以计算收敛性、位移突变和塑性区贯通作为失稳判据,在考虑渗流-应力耦合理论基础上,采用强度储备法对重力坝深层稳定安全度进行评价,探讨不同重力坝坝基模型情况下各失稳判据的适用性和安全情况。结果表明,在利用强度储备法研究坝基深层滑动时,采用位移突变和塑性区贯通综合确定系统是否达极限平衡状态偏于安全,对于不同的结构面倾角,强度储备系数与等K法安全系数变化趋势基本一致。
The existing underground water activates the interaction between the stress field and seepage field.The infiltration hydrostatic pressure contributes to the increseament of maximun value of stress components in the dam as well as the stress concentration in the key points.From the engineering practical point of view,it is of great importance and necessary to study the deep anti-sliding stability with the coupling theory of hydraulic conductivity and stress.Adopting computation convergence and catastrophe of displacement as well as connectivity of plastic zone as the judgments of structure failure,the deep anti-sliding stability of gravity dam was evaluated on the basis of coupling theory of hydraulic conductivity and stress.Combining the material properties degradation method and using the ABAQUS,the gravity dam stability safety factor and the effectiveness of the evaluation method and judgment with different potential sliding path were discussed.The analysis results show that,using the predestined method,the comprehensive judgment combing the catastrophe of displacement and connectivity of plastic zone is on the conservative side of the real situation when determining the limit state.For the different angle of sliding path,the tendency of safety factor of material properties degradation method meets well with K method by using in the codes of gravity dam.
出处
《力学季刊》
CSCD
北大核心
2011年第2期147-152,共6页
Chinese Quarterly of Mechanics
基金
国家重点研究发展计划973项目(2007CB14104)
国家自然科学基金重点项目(50539030)
关键词
计算收敛性
位移突变
塑性区贯通
渗流—应力耦合
强度储备法
computation convergence
displacement catastrophe
connectivity of plastic zone
coupling of hydraulic conductivity and stress
material properties degradation method
