摘要
针对拱坝裂纹扩展问题,以某拱坝为例,建立了大坝-地基-库水系统的三维有限元模型.在此基础上,基于全耦合的拱坝-地基-库水模型,利用扩展有限元法(extended finite element methods,XFEM)对地震作用下的底缝开裂进行了模拟分析.研究中,在坝体上游底部设置了不同位置的人工短缝,以探讨拱坝在强震条件下的底缝开裂响应.结果表明:横缝削弱了坝体的整体性,增大了坝体的位移响应,但增设横缝可有效减小坝体的应力响应;在坝体底部设置人工短缝显著降低了坝踵的应力响应;拱坝的横缝对底缝开裂影响显著,能限制底缝的横向扩展,减少坝体的开裂损伤.
For the issue of crack propagation in arch dams,a three-dimensional finite element model of the dam-foundation-reservoir system was established,using a specific arch dam as an example.Based on this fully coupled arch dam-foundation-reservoir model,the extended finite element method(XFEM)was employed to simulate the cracking of the base joint under seismic loading.In the study,artificial short cracks were introduced at different locations at the bottom of the upstream side of the arch dam to explore the base joint cracking response under strong earthquake conditions.The results indicated that transverse joints weakened the overall integrity of the dam and increased its displacement response,but the addition of transverse joints could effectively reduce the stress response of the dam.Introducing artificial short cracks at the bottom of the dam significantly reduced the stress response at the dam heel.The transverse joints in the arch dam had a significant impact on the base joint cracking,effectively limiting the lateral propagation of the base joint and reducing the cracking damage of the dam.
作者
孙立国
李斌
江守燕
杜成斌
SUN Liguo;LI Bin;JIANG Shouyan;DU Chengbin(Department of Engineering Mechanics,Hohai University,Nanjing 211100,China)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2024年第6期25-31,共7页
Journal of China Three Gorges University：Natural Sciences
基金
国家重点研发计划项目(2018YFE0122400)
河海大学大型仪器设备共享基金(B220370223)。
关键词
拱坝
扩展有限元法
横缝
底缝
地震响应
裂缝扩展
arch dam
extended finite element method
transverse joint
bottom joint
seismic response
crack propagation
