碾压混凝土成层特性对重力坝静、动力分析的影响研究

Influence of Strattified Characterestics of RCC on Static and Dynamic Analyses of Gravity Dams

碾压混凝土由于采用逐层碾压的施工方法，致使所形成的大体积混凝土在竖向和水平向具有不同的弹性常数。本文以龙滩碾压混凝土重力坝为工程实例，研究了上述弹性特性差异对坝体静、动力分析所产生的影响。研究结果表明，碾压混凝土竖向弹模的降低对自重、水压等主要静载所产生的应力分布影响不大，但对坝踵、坝趾局部控制性应力值将会产生一定的影响；对坝体的自振振型特性影响不大，但对自振频率值有明显影响。

The Roller Compacted Concrete has different elastic constants in horizontal and ver-tical directions,because of layer by layer compaction in the construction. The influence of thisdifference on static and dynamic analyses of Longtan Gravity Dam has been studied in this paper.The results indicate that the influence on the stress distribution induced by dead weight and hy-drostatic pressure is not significant,while the local stresses near the dam heel and toe have certainvariations after taking account of the reduction of vertical elastic modulus E_y,the influence on themode shapes of the dam is small,but the natural frequencies of the dam have an obvious reduc-tion with E_y decreasing.