碾压混凝土拱坝沿层面破坏机理研究  

Study on the failure mechanism of RCC arch dam along layer surface

作　　者：张仲卿 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004

出　　处：《水利学报》2003年第2期61-65,共5页Journal of Hydraulic Engineering

基　　金：'九.五'国家重点科技攻关(96-220-02-01(3))项目

摘　　要：结合沙牌碾压混凝土拱坝的非线性有限元计算,仿真结构模型试验和岩滩碾压混凝土拱围堰炸除的实地考察,研究碾压混凝土的本构关系,沿层面产生薄弱环节的原因,形成各向异性。用数值计算和仿真试验模拟薄弱环节。在超载时层面首先开裂,随着超载加大,拱坝失去承载能力,直至坝体沿层面破坏,这与均质的石膏结构模型试验有本质区别,它无法反映沿层面破坏的特征,而沿45°方向破坏。炸除岩滩围堰也证明了沿层面破坏的机理。因此对层面进行"热缝"浇筑和加垫层铺筑,对提高层面抗剪和抗拉强度具有重要意义。Investigation was made on the failure mechanism along layer surface in RCC dams. Computations with a nonlinear finite element model and simulation tests with a structural model were conducted for the Shapai Arch Dam. A field study of the demolition of the RCC cofferdam in Yantan project was also made. The weakness along the layer surfaces formed in RCC dam building was the reason of anisotropy of the dam. When the load exceeds the design value, the dam would fail along the weak layer surfaces. In order to raise the shear strength and tensile strength along the layer surfaces, a method of 'hot seam' placing and adding layer placing was recommended.

关 键 词：碾压混凝土拱坝 破坏机理 层面 非线性 有限元 

分 类 号：TV642.2[水利工程—水利水电工程]