摘要
拱坝作为一种安全性及经济性均较优的坝型,在世界各地都得到了广泛的采用。然而拱坝对地形地质条件的要求较其它任何坝型都高,坝肩的稳定与否,将直接关系到工程的正常运行和安全性。所以拱坝坝肩稳定是拱坝设计中需要重点关注的问题。锦屏一级水电站坝址具备修建高拱坝的优越地形条件,但地质构造较复杂,坝肩抗力体内部存在断层、层间挤压带、煌斑岩脉X及深部裂缝等不良地质构造,直接影响到拱坝坝肩的整体稳定安全性,需要开展坝肩稳定深入研究。本文采用强度储备与超载相结合的三维地质力学模型综合法试验对锦屏一级拱坝坝肩的地形、地质条件进行模拟,研究拱坝坝肩的稳定性。通过破坏试验得出了坝体与坝肩变形及分布特征、坝肩破坏形态和破坏机理,确定了坝肩综合试验法稳定安全度,并针对坝肩薄弱环节提出了加固处理措施建议。
As a type of safe and economical dam,arch dam is widely constructed in the world,but its requirements on topographic and geological conditions are stricter than any of the other dams.Abutment stability of an arch dam is a fatal factor to the project’s operation performances and safety,and it often becomes one of the most concerns at the dam design stage.At the dam site of Jinping-I hydropower where the topographic conditions are relatively better,the geological structures are extremely complex and many unfavorable structures have been found in the abutment resisting rock foundation,such as faults,crushed bedding zones,X lamprophyre dikes and deep cracks.This paper presents an experimental study of the stability of Jinping-I’s abutment by using a three-dimensional geomechanical model that was designed by the similarity of topographic and geological conditions.Through a comprehensive failure test combining the strength reserving and overloading techniques,the features of deformation distribution,failure pattern and failure mechanism of the dam body and the dam abutment were obtained,and a comprehensive safety factor was determined.Reinforcing measures of the abutment’s weak regions are suggested.
出处
《水力发电学报》
EI
CSCD
北大核心
2010年第5期82-86,101,共6页
Journal of Hydroelectric Engineering
基金
国家自然基金资助项目(编号50879050)
国家重点基础研究发展计划(973)项目(2010CB226802)
关键词
水工结构
坝肩稳定
综合法试验
高拱坝
安全度
hydraulic structure
abutment stability of arch dam
geomechanical model test
high arch dam
safety factor
