龙洞槽砌石拱坝加固方案三维有限元分析

针对龙洞槽砌石拱坝除险加固工程,基于三维有限元法,对比分析了坝体上游侧、下游侧培厚加固方案在基本荷载组合与特殊荷载组合作用下的应力和位移,包括三种典型的粘结工况及配筋工况,并确定合适的加固方案与工程措施。结果表明:基本荷载组合是上游测、下游侧加固方案的控制荷载组合,需在冬季对拱坝采取适当的保温措施,以减少温度降低对拱坝坝体应力变形的影响;两种加固方案均满足规范应力要求,但是上游加固方案在加固效果、施工便捷等方面更具优越性;新老坝体粘结效果对拱坝应力位移具有较大影响;在坝体中上部布设径向配筋,有助于减弱新老坝体粘结强度不足对坝体应力应变的影响。

Three Dimensional Finite Element Analysis of the Reinforcement Project of Longdongcao Masonry Arch Dam

In this paper the reinforcement project for Longdongcao masonry arch dam is simulated based on 3D finite ele-ment method .The stress and displacement distribution of thickening reinforced schemes on the upstream and downstream side under conditions of basic load combination and special load combination are compared and analyzed . In addition three typical bonding and reinforcement conditions are also considered ,and the appropriate reinforcement program and engineering measures are obtained .The results show that :the basic load combination is the primary load combination in upstream and downstream reinforcement scheme ,and thermal insulation measures should be taken for arch dam in the winter to reduce the influence of low temperature ;two reinforcement projects meet stress requirements uniformly according to the standard ,however ,the project of thickening upstream face of arch dam has an advantage in strengthening effect , convenient construction and so on ;the bonding results of the original and the thickened body exert an importance impact on the stress and displacement of arch dam ,therefore we suggest to strengthen construction management and improve con-struction quality to enhance the bonding strength of the interface ;reinforcing bars in the middle upper part of the arch dam is beneficial to reduce the influence of bonding strength insufficient of original and the thickened body ,which is dev-astating for the stress and displacement of dam .