基于温度应力仿真分析的碾压混凝土重力坝诱导缝开裂研究

考虑彭水水电站碾压混凝土坝的实际碾压浇筑过程，采用混凝土钝裂缝带模型，在三维瞬态有限元温度应力仿真分析的基础上，对大坝诱导缝的开裂及裂缝扩展进行了跟踪计算。计算结果表明，坝体的上游面诱导缝缝端应力强度因子局部超过混凝土的断裂韧度而发生开裂，且诱导缝的开裂明显减小了坝段中部区域的拉应力。根据诱导缝的开裂分析结果，建议诱导缝的设置长度为4．5m。

STUDY ON SLIT AND TRANSVERSE JOINT OF ROLLER COMPACTED CONCRETE GRAVITY DAM BASED ON TEMPERATURE STRESS SIMULATION ANALYSIS

Considering the true construction process of Pengshui Hydropower Station roller compacted concrete(RCC) gravity dam and adopting the blunt crack band model of concrete,transient finite element is applied to simulating layer-by-layer construction process to get the temperature field and stress field from construction period to operating period.Then crack and propagation of the dam-induced slits are computed by dynamic tracking method.The simulating analytical results of the whole dam show if induced of slit tip stress intensity factors exceed tensile bearing capacity of concrete on upstream face,and induced crack occurs.The crack of induced slit leads to tensile stress release near slit.The length of the induced slit of Pengshui Hydropower Station dam is suggested to 4.5 m on the basis of the cracking analytical result.