首页 | 本学科首页   官方微博 | 高级检索  
     

混凝土大坝闸墩裂缝预应力锚固过程中的应力分析及其加固实践
引用本文:李守巨,刘迎曦,张军,陈昌林,李正国.混凝土大坝闸墩裂缝预应力锚固过程中的应力分析及其加固实践[J].岩石力学与工程学报,2005,24(A02):5464-5469.
作者姓名:李守巨  刘迎曦  张军  陈昌林  李正国
作者单位:[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024 [2]丰满发电厂,吉林吉林132108
基金项目:国家自然科学基金资助项目(10472025)
摘    要:由于气温的交替变化,处于寒区的混凝土大坝必然产生温度应力。当温度拉应力大于混凝土的抗拉强度时,混凝土大坝闸墩会产生局部裂缝,严重时导致大坝闸墩产生贯穿性裂缝。结合丰满混凝土大坝溢流坝段闸墩加固工程实践,采用非线性有限元数值方法分析了在不同预应力荷载工况下预应力锚固过程中大坝闸墩混凝土的应力变化。根据有限元数值计算结果。提出了优化预应力锚索布置和锚固力大小的方法,解决了大坝堰顶处混凝土在锚固过程中局部拉应力过大的技术难题。工程实际应用结果表明,根据有限元数值模拟结果指导预应力锚索的设计和施工是可行的、所采取的工程技术措施起到了预期的工程效果。

关 键 词:水工结构  混凝土大坝  闸墩加固  预应力锚固  应力场  Drucker-Prager屈服准则
文章编号:1000-6915(2005)增2-5464-06
收稿时间:2005-06-26
修稿时间:2005-06-262005-07-03

STRESS CALCULATION FOR GATE PIER OF CONCRETE DAM DURING ANCHORING PROCESS AND ITS REHABILITATION TECHNIQUES
LI Shou-ju, LIU Ying-xi, ZHANG Jun, CHEN Chang-lin, LI Zheng-guo.STRESS CALCULATION FOR GATE PIER OF CONCRETE DAM DURING ANCHORING PROCESS AND ITS REHABILITATION TECHNIQUES[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(A02):5464-5469.
Authors:LI Shou-ju  LIU Ying-xi  ZHANG Jun  CHEN Chang-lin  LI Zheng-guo
Affiliation:1. State Key Laboratory of Structural Analysis for Industry Equipment, Dalian University of Technology, Dalian 116024, China. 2. Fengman Hydropower Plant, Jiiin 132108, China
Abstract:The thermo stresses in the concrete dam will produce because of changing of weather temperatures. The local fractures in gate pier of dam occur while the thermo stresses exceed the tensile strength of concrete, and sometimes, some fractures can extend from dam top to the spillway siarface. Combining with the pier rehabilitation project of Fengman concrete dam, the nonlinear finite element method is applied for calculating the stress changes of concrete piers during anchoring process in the different load cases. The optimization arrangement method for prestress scales and anchoring locations are presented in order to deal with local stress larger than concrete tensile strength. The practical application shows that numerical simulation approach with finite element method is feasible to guide the design and operation of pier rehabilitation, and the proposed engineering measures are effective for preventing dam pier from local fracturing during anchoring process.
Keywords:hydraulic structure  concrete dam  pier rehabilitation  prestressed anchoring  stress fields  Drucker-Prager yield criterion
本文献已被 维普 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号