坝头下游面裂缝对重力坝抗震性能的影响研究  

Study on Seismic Performance of Gravity Dam with the Crack at the Downstream Face of Dam Head

作　　者：宋琰 张汉云[1] 章寰宇 王皓臣 涂千蛟 SONG Yan;ZHANG Han-yun;ZHANG Huan-yu;WANG Hao-chen;TU Qian-jiao(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,江苏南京210098

出　　处：《水电能源科学》2025年第3期128-131,78,共5页Water Resources and Power

基　　金：国家自然科学基金项目(52479122);中国水利水电科学研究院水利部水工程建设与安全重点实验室项目(IWHR-ENGI-202303)。

摘　　要：某已建重力坝泄洪坝段在运行过程中,坝头下游面出现深层裂缝。为评估裂缝对坝段抗震性能的影响,建立泄洪坝段-地基相互作用模型分析了开裂坝体的地震动力响应,基于热—应力耦合接触模型模拟坝头裂缝,分析了裂缝开度随季节温度的变化,根据非线性动力时程分析的结果,预测坝头带裂缝及裂缝开度最大时,溢流坝段在设计地震作用下裂缝扩展的可能性,分析了坝体的强度和建基面抗震稳定性。结果表明,设计地震作用下,该坝头裂缝发展的可能性较小,坝头裂缝对坝段整体的抗震性能影响不大。During the operation of a certain existing gravity dam's spillway section,deep cracks appeared on the downstream face of the dam head.To evaluate the impact of the cracks on the seismic performance of the dam section,a spillway dam monolith-foundation interaction model has been established to analyze the seismic dynamic response of the cracked dam body.This model employs a thermo-mechanical coupling contact model to simulate the crack at the dam head and analyzes the variation in crack gap corresponding to seasonal temperature fluctuations.Based on the results derived from a nonlinear dynamic time history analysis,the potential for crack propagation under design seismic loading conditions has been predicted when the crack and the maximum crack gap are present at the dam head.Furthermore,an assessment of the integral structural seismic strength and stability of its foundation plane has been conducted.The results show that under the designed seismic loading,the likelihood of further development of the crack at the dam head is minimal,and the crack of the dam head has little impact on the seismic performance of the whole dam section.

关 键 词：水工结构 重力坝 热应力耦合接触模型 裂缝开度 抗震性能 

分 类 号：TV312[水利工程—水工结构工程] TV642.3