摘要
采用三维非线性有限元,以累积自重和设计水压为基本荷载,利用超载法和部分的超载、强度降低的综合法分析了某高拱坝的失稳破坏过程,得到其整体安全系数和破坏特征。结果表明,该拱坝的整体安全系数大于3.4时,超载法坝体的破坏表现为开裂区不断扩展,直至丧失承载能力,有明显的破坏过程;综合法的破坏是突发性的,在地基强度降低至一定值时,位移突变,坝体失稳。
The height of a arch dam is 305m, which is beyond the existing constructe level. It is necessary to evaluate safety of the dam. Based on three-dimensional nonlinear FEM, the integral safety degree and failure mechanism of the dam are studied. There are two methods to evaluate the safety of arch dam, such as overload method and synthetic method. Using these two methods, a conclusion is obtained that the integral safety degree of the arch dam beyond 3.4. The damage process is evident in case of cracking zone enlarging in case of using overload method analysis, while the damage process is happened abrupt with displacement increasing unexpected in case of using synthetic method analysis.
出处
《水电能源科学》
2005年第4期44-47,共4页
Water Resources and Power
关键词
高拱坝
整体安全度
超载法
综合法
非线性有限元
累积自重
high arch dam
integral safety degree
overload method
synthetic method
nonlinear FEM
gravity accumulation
