Abstract: Comparative study of numerical simulation methods for deep-seated sliding stability of gravity dams under multiple criteria// by WANG Linfa// Liaoning Shengshun Construction Engineering Co., Ltd. Abstract: This study focuses on the surface spillway section of the gravity dam of a reservoir. Using both thin-layer element and contact element to simulate the deep shear zone in dam foundation, a finite element model of dam body and foundation is established to systematically analyze its deep-seated slid ⁃ ing stability. By comprehensively considering four instability criteria, namely displacement discontinui ⁃ ty, plastic zone penetration, energy discontinuity and contact surface state, the sliding stability safety fac ⁃ tors along faults F1, F2 and F3 are obtained as 3.0, 1.6 and 2.0. The study shows that the energy criteri⁃ on and contact surface state criterion are in good agreement with the traditional plastic zone criterion, validating the effectiveness of the multi-criteria comprehensive analysis method.

Key words: gravity dam, multiple weak interlayers, sliding stability, instability criterion

摘要： 针对某水库重力坝表孔坝段，采用薄层单元与接触单元两种方法模拟坝基深层剪切带，建立了坝体-坝基
有限元模型，系统分析了其深层抗滑稳定性。通过综合位移突变、塑性区贯通、能量突变及接触面状态四种失稳
判据，获得沿F1、F2和F3断层的抗滑稳定安全系数分别为3.0、1.6和2.0 。研究表明，能量判据与接触面状态判据
同传统塑性区判据具有良好的一致性，验证了多判据综合分析方法的有效性。

关键词: 重力坝, 多软弱夹层, 抗滑稳定, 失稳判据