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五嘎冲拱坝右岸坝肩由于存在张性裂隙、软弱层以及泥化夹层等地质缺陷,坝肩抗滑稳定不能满足要求而采取加固措施。根据工程最新揭示的地质资料、拱坝结构设计成果以及加固处理措施,建立拱坝–地基整体三维数值模型。采用满足Mohr-Coulomb屈服准则的节理单元,模拟基岩中张性裂隙、软弱夹层、层间泥化夹层等构造。采用非线性有限元法,对加固前后坝基岩体及结构面的变形、屈服区进行对比分析,评价右岸坝肩加固处理措施的有效性,采用水容重超载法分析拱坝坝体和地基岩体的变形以及屈服状态的发展过程,给出加固处理后拱坝–地基系统的整体安全度,结合工程类比,综合评价五嘎冲拱坝的整体安全性。计算成果表明,针对右岸L1张性裂隙所进行的加固处理措施可明显提高右岸坝肩的稳定性,加固效果显著,五嘎冲拱坝坝肩加固处理后超载安全度较高,处于高坝工程的偏上位置。
Due to the geological defects such as zonal fissures, weak layers and muddy intercalations, the dam abutment on the right bank of Wugarchong arch dam can not meet the requirements for stability against sliding, and reinforcement measures should be taken. According to the latest revelation of geological data, the results of arch dam structure design and reinforcement measures, the overall three-dimensional numerical model of arch dam-foundation is established. A joint element satisfying the Mohr-Coulomb yield criterion is used to simulate the structure of tensile fractures, weak intercalations and interlayer mud intercalations in bedrock. The non-linear finite element method is used to analyze the deformation and yielding area of rock mass and structural surface before and after the reinforcement. The validity of reinforcement measures on the right bank abutment is evaluated. The waterlogging overloading The overall safety of the arch dam-foundation system is given, and the overall safety of the Wugachong Arch Dam is evaluated based on the engineering analogy. The calculation results show that the reinforcement measures for the L1 right-sided fractures on the right bank can obviously improve the stability of the dam abutment on the right bank, and the reinforcement effect is remarkable. The overloading safety of the dam abutment of the Waga Chong arch dam is relatively high, The upper position.