摘要
古贤碾压混凝土重力坝最大坝高达到200 m级,需要研究坝体的极限承载能力以保障大坝安全。应用容重超载法和水头超载法,坝体结构采用Abaqus软件中Drucker-Prager模型,探讨了不同超载方法下坝体极限承载能力及其差异。通过扩展有限元方法研究了上游面的裂缝扩展对坝体极限承载能力的影响,并用高压水劈裂试验结果校正了该扩展有限元模型的计算参数。分析结果表明:容重超载系数比水头超载系数高64.8%,且两种超载方法的破坏模式存在明显区别;高压水劈裂因素显著降低了坝体极限承载能力,降低幅度在33%~44%之间,高压水劈裂因素使得坝体极限承载能力更加符合实际情况。分析了坝体裂缝扩展情况与容重超载系数之间的关系,并给出了坝体裂缝的处理建议。
The height of Guxian RCC gravity dam is more than 200 meters,so it is necessary to study the ultimate bearing capacity of dam body to ensure dam safety.The overload methods used in this study are bulk density overload method and head overload method respectively,and the Drucker-Prager model in Abaqus software is used to describe dam body.The ultimate bearing capacity of dam body under different overload methods is analyzed,and its difference is also discussed.The influence of crack propagation in upstream surface on the ultimate bearing capacity of dam is studied by extended finite element method,and the calculation parameters of extended finite element model are corrected by the test results of hydraulic fracturing.The analysis results show that,the overload coefficient of head overload mode is 64.8%lower than that of bulk density overload mode,and the plastic zones of the two overload methods are obviously different;the hydraulic fracturing significantly reduces the ultimate bearing capacity of dam body by 33%-44%,so the hydraulic fracturing factor makes the ultimate bearing capacity of dam body more in line with the actual situation.At the same time,the relationship between the crack propagation of dam body and the bulk density overload coefficient is analyzed,and the treatment suggestions of dam crack are proposed.
作者
赵磊
贾金生
Mohamed Ramadan
吴洋锋
丁廉营
ZHAO Lei;JIA Jinsheng;Mohamed Ramadan;WU Yangfeng;DING Lianying(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,China Institution of Water Resources and Hydropower Research,Beijing 100038,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100091,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China)
出处
《水力发电》
CAS
2023年第5期51-57,70,共8页
Water Power
基金
国家重点研发计划(2018YFC0406800)。
关键词
容重超载法
水头超载法
扩展有限元法
高压水劈裂试验
极限承载能力
破坏模式
古贤碾压混凝土重力坝
bulk density overload method
head overload method
extended finite element method
hydraulic fracturing test
ultimate bearing capacity
failure mode
Guxian RCC gravity dam
