大仓面碾压混凝土拱坝横缝少 ,整体性好 ,仓面准备工作量少 ,浇注工艺简化 ,施工速度快 ,省水泥和温控措施 ,但施工期内外温差约束强 ,运行期均匀温降及温差应力大 .拱结构研究表明 :在上游坝肩拉力区设人工折缝 ,将折缝缝端置于低应力区 ,下游面拱冠设径向短缝 ,可以大大减少或消除温度和水压引起的拉力 ;从近缝两侧有限元节点位移差直接求得缝端应力强度因子 ,和缝端止裂措施组合韧性比较 ,可以保证人工构造缝的稳定 .该设计已用于碾压混凝土工程 ,实测表明在超高水位下运行时人工短缝张开小于 1mm ,止裂措施后实测应变小于 37个微应变 ,止裂效果好 ,人工缝保持稳定 . There are few transverse joints in Dacang Ruming RCC arch dam, the integrity is good, the work load for preparation of cofferdam is small, the pouring process is simplified, the construction speed is fast, the cement and temperature control measures are effective. However, The results of arch structure research indicate that artificial creasing in the tension area of ​​the upstream abutment, placing the crease joint in the low-stress area and radial creasing in the downstream arch can greatly reduce or eliminate the temperature and Hydraulic pressure caused by tension; Finite element from both sides of the seam near the node displacement directly obtained by the end of the stress intensity factor, and the crack tip combination of measures of toughness to ensure the stability of the artificial structure of the joint. The design has been used for rolling Concrete works, the measured results show that the artificial stitches open less than 1mm when running under ultra-high water level, the measured strain after the crack arrest measure is less than 37 micro-strains, crack arrest effect is good, artificial stitches remain stable.