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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 existence of groundwater will make the seepage field and stress field interact and interact with each other. Due to the infiltration of hydrostatic pressure, the maximum value of each component of the dam increases, which also aggravates the stress concentration at each characteristic point of the dam. Therefore, considering the actual engineering conditions and the influence of seepage on the calculation, the fluid-solid coupling method It is necessary to analyze the deep stability of gravity dam against sliding. With the aid of finite element analysis software ABAQUS, the stability of deep stability of gravity dams was evaluated by considering the seepage-stress coupling theory and using the strength reserve method to calculate the convergence, displacement mutation and plastic zone penetration as the instability criterion respectively Applicability and safety of each instability criterion under different gravity dam foundation model. The results show that when using the strength reserve method to study the deep sliding of the dam foundation, the system of displacement mutation and plastic zone penetration is comprehensively used to determine whether the limit equilibrium state of the system is biased to safety. For different structural plane inclination, the strength reserve coefficient and the change of K factor safety factor The trend is basically the same.