周边缝对U形河谷拱坝应力位移的影响  

The Stress and Displacement Effect of Perimeter Joint on the U-shape Valley Arch Dam

作　　者：连子怡 王均星[1] 李明军[1] 杨凡 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]河南省水利勘测设计研究有限公司,河南郑州450000

出　　处：《水电能源科学》2017年第1期85-88,共4页Water Resources and Power

摘　　要：针对宽底的U形河谷拱坝坝踵常出现过大拉应力的问题,以某U形河谷拱坝为例,利用ANSYS三维有限元分析软件,通过设立5组不同的计算组合,分析研究了材料非线性、设置不同范围的周边缝对拱坝位移场、应力场及坝体可能存在开裂区的影响。结果表明,设缝后拱冠梁表现出顺河向的平移和倒向上游的转动两种刚体位移趋势,拱冠梁截面上游面的梁向拉应力减小甚至出现压应力,下游压应力也有所减小,周边缝设缝范围的改变对拱坝的应力及坝体可能存在的开裂状况影响不大。There is usually large tensile stress occurred at dam heel, especially for the arch dam with wide bottom on the U-shape valley. Taking a certain arch dam on the U shape valley for an example, three dimensional model with AN- SYS was established to make a nonlinear FEM analysis in the paper. Based on setting 5 sets of calculation combination, the influence on the stress field and displacement field of arch dam by changing nonlinear characteristics and the range of perimeter joint was researched. Besides, the influence of setting perimeter on crack area which may appear on the dam was comprehensively analyzed. The research results indicate that the crown cantilever appears two kinds of displacement tendency after setting perimeter joint ： the translation along river and the rotation towards upstream. The tensile stress in hoop direction on the upstream face of crown cantilever decreases and even turns into comprehensive stress, while the compressive stress on the downstream face decreases as well. The change of the area of perimeter joint leaves little effects on the stress condition and the crack condition which may appear at the arch dam.

关 键 词：周边缝 U形河谷 拱坝 ANSYS 非线性有限元 

分 类 号：TV642.4[水利工程—水利水电工程] TV31