摘要
水工压力隧洞无粘结预应力混凝土衬砌是一种新型的衬砌形式,本文结合工程设计实例,对衬砌结构在运行期假定锚索失效情况下的应力分布状态进行了计算分析,藉此对这种新型衬砌形式的可靠性进行评价。计算结果表明,运行期若某根锚索失效,将对衬砌的应力状态产生不同程度的影响,其影响大小和影响范围与失效锚索所在位置有关,浇筑块中部某根锚索失效的影响较小,浇筑块端部第1根锚索失效是最不利工况,拉应力区出现在衬砌底部内侧表面和锚具槽边角部位。在最不利工况下,锚具槽边角部位的拉应力会超过混凝土的抗拉强度,有可能引起开裂和渗漏。
Prestressed tunnel liner is a new type of concrete liner for hydraulic pressure tunnel. In order to evaluate its reliability, a 3D finite element analysis is carried out on the stress states of the tunnel liner in consideration of one of the prestressed tendons broken during service life. It is found that the deterioration of stress states of the liner depends on the location of the broken tendon, the most harmful situation is that the first tendon near the end of the construction block is broken. In the most harmful situation, the tensile tendon and the edges of boxouts will be in excess of the concrete tensile and seepage. stress in the concrete liner near the broken strength, it is possible to cause local cracks
出处
《水力发电学报》
EI
CSCD
北大核心
2006年第4期83-87,共5页
Journal of Hydroelectric Engineering
关键词
水工结构
应力状态分析
三维有限元
隧洞预应力混凝土衬砌
hydraulic structures
stress state analysis
3-D finite element method
prestressed concrete tunnel liner
