龙羊峡重力拱坝运行期变形与应力反演分析  

Inverse Analysis on the Deformation and Stress of Longyangxia Gravity-arch Dam during Operation Period

作　　者：袁占荣 周天宇 吕维娟 刘昌伟 潘坚文[2] 王进廷[2] YUAN Zhanrong;ZHOU Tianyu;L Weijuan;LIU Changwei;PAN Jianwen;WANG Jinting(State Power Investment Corporation Qinghai Yellow River Electric Power Technology Co.,Ltd.,Xining 810016,Qinghai,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]国家电投集团青海黄河电力技术有限责任公司,青海西宁810016 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水力发电》2022年第9期62-66,107,共6页Water Power

摘　　要：基于龙羊峡重力拱坝实测数据,建立拱坝-地基有限元模型,进行了反演分析,确定了合理的温度分布函数的参数,以及坝体与基岩材料弹性模量。采用反演得到的有限元模型计算了龙羊峡重力拱坝运行期温度场分布及坝体变形与应力分布。结果表明,龙羊峡重力拱坝坝体中心温度常年几乎没有变化,坝面区域温度变化受外界影响较大;坝体混凝土弹性模量相比于设计试验值大,提升约25%;应力状态方面,坝体整体受压,冬季由于气温较低,坝面区域存在小范围拉应力区,拉应力水平较小,不影响工程安全运行。Based on the measured data of Longyangxia Gravity-arch Dam, the arch dam-foundation finite element model is established, and the inverse analysis is carried out to determine the reasonable parameters of temperature distribution function, as well as the elastic modulus of the dam body and bedrock materials. Using the finite element model obtained by inverse analysis, the temperature field distribution and the dam body deformation and stress distribution during the operation period of Longyangxia Gravity-arch Dam are calculated. The results show that,(a) the temperature in dam center area hardly changes all year round, while the temperature in dam surface area is greatly affected by the outside environment;(b) compared with the experimental value, the elastic modulus of dam body concrete is increased by about 25%;and(c) in terms of stress state, the dam body is compressed as a whole. Due to the low temperature in winter, there is a small area of tensile stress in dam surface area, but the level of tensile stress is smaller, which does not affect the safe operation of the project.

关 键 词：有限元 温度场 参数反演 弹性模量 应力分析 龙羊峡拱坝 

分 类 号：TV642.4[水利工程—水利水电工程]