重力坝动力深层抗滑稳定性研究

基于我国西南某待建高碾压混凝土重力坝,建立了典型坝段三维有限元接触分析模型,分别采用强度折减动力分析法和时程安全系数分析法,综合研究了坝基动力深层抗滑稳定性。同时针对传统时程安全系数分析存在的局限性,基于概率统计深入探讨并改进了可靠度动力安全系数评价指标。研究结果表明,大坝满足动力深层抗滑稳定设计要求,本文所采用的理论方法能够考虑地震作用的往复性和随机性,评价结果更为科学合理,为重力坝动力抗滑稳定的定量判别进行了有益探索。

Research on dynamic deep sliding stability of gravity dam

Based on a high RCC gravity dam to be built in the Southwest China， a 3-D finite element contact analysis model of the typical dam section is established， and then the dynamic deep sliding stability of the dam foundation is comprehensively studied with the strength reduction dynamic analysis method and the time-history safety coefficient analysis method respectively. Meanwhile， the evaluation index of the dynamic safety factor for the reliability is improved and deeply discussed according to the relevant probability statistics for the limitation of the conventional time-history safety coefficient analysis. The study result shows that the dam can meet the design requirement of the dynamic deep sliding stability. Therefore， the theoretical methods adopted herein can consider the reciprocation and randomness of the seismic effect， thus the evaluation result is more scientific and reasonable， while the study makes a beneficial exploration on the quantitative identification of dynamic deep sliding stability of gravity dam as well.