丹江口大坝加高溢流坝闸墩结构分析

Analysis on Overflow Dam Structure of Danjiangkou Dam in Heightening

以丹江口大坝溢流坝边墩为研究对象,通过三维有限元接触问题非线性计算,分析在溢流面加高过程中,不同的溢流面与老闸墩的结合状态下(脱开与不脱开),各阶段包括加高完成后、正常蓄水位、设计洪水位、校核洪水位时闸墩的受力状况、锚筋应力和结合面张开度。计算结果表明:锚筋的无黏接长度以100cm为宜;将边墩162m高程以上加高部分与旁边重力坝段加高部分连成整体,或在结合面张开最大的部位沿竖直向增加一排约束,均可有效减小混凝土竖直向应力,且对抑制结合面张开亦有较大作用。

By three-dimensional finite element contact question non linear simulation computation, this article, taking the overflow dam side pillar of DanJiangkou dam as the study object, analyzes the floodgate pillar stress state, the anchor rod stress and the seam open at different bound condition （joint or disjoint） between the overflow surface and the floodgate pillar in various heightening stages, which involve completion of heightening, the normal store water level, design flood level and check flood level. The results indicated that, the non-cementation length of anchor bar takes 100 cm as proper; connecting heightened part above the 162 m of side pillar with that of adjacent gravity dam section as a whole, or setting a row of restraint along vertical direction at the largest open spot in the seam surface, might reduce the concrete vertical stress effectively, and suppress the seam to open greatly.