摘要
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。
Since there exist some geological defects such as extensional fractures, weak layers and clay interactions in the right dam abutment of Wugachong Arch Dam, the dam abutment anti-sliding stability cannot meet the safety requirements, thus some reinforcement measures need to be taken. According to the Wugachong Arch Dam's latest geologic data and the arch dam structure design results, a 3D numerical model for the whole arch dam is built. The joint elements for Mohr-Coulomb yield criterion are adopted to simulate the structure of the foundation's extensional fractures, weak layers and clay interactions. Using the nonlinear finite element method, the deformation and yield region of foundation rock and structural surfaces before and after reinforcement are compared; the effectiveness of the reinforcement measures to the right bank abutment is evaluated. The deformation and yield condition's development of arch dam and foundation rock is analyzed by using water density overload method. And the global safety of arch dam-foundation system after reinforcement is given. By comparison with similar engineering, the Wugachong Arch Dam's global safety is evaluated comprehensively. The results show that the reinforcement measures to the extensional fracture L1can improve on the right bank abutment stability obviously. After reinforcement, Wugachong Arch Dam's abutment has high overload safety which is superior among the high dams.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2017年第S1期374-380,共7页
Rock and Soil Mechanics
基金
国家自然科学基金项目(No.51579252
No.51439005)
流域水循环模拟与调控国家重点实验室自主研究课题(No.2015TS05)
中国水利水电科学研究院基本科研业务费专项项目(No.SS0145B322017)
国家重点研发计划项目(No.2016YFB0201000)~~
关键词
拱坝
坝肩
强度折减法
超载法
变形
安全度
arch dam
dam abutment
shear strength reduction method
overload method
deformation
safety
