碾压混凝土坝弹性力学参数渐变规律分析

Gradual change law of elastic mechanical parameters of roller compacted concrete dam

受振动碾压和龄期的影响,碾压混凝土坝力学参数具有空间和时间的渐变特性。这些渐变特性导致碾压混凝土坝力学参数的复杂变化,是各碾压层本体和层面的力学参数以及层面厚度难以准确确定的主要原因。本文首先针对碾压混凝土坝各相邻碾压层弹性模量和徐变度差别较小的特点,研究了碾压混凝土坝并层龄期的确定方法;然后考虑碾压混凝土的空间渐变特性,结合复合材料力学串并联模型,建立了典型碾压层弹性计算参数分析模型;进一步利用并层算法,构建了并层体的弹性计算参数分析模型;最后,在碾压混凝土坝并层等效弹性力学参数反分析的基础上,利用粒子群算法,求解出了碾压混凝土坝弹性渐变参数。工程实例表明,本文提出的方法是可行有效的。

For the effects of vibration and age, the mechanical parameters of roller compacted concrete dam （RCCD） have gradual change characteristics in space and time, which make a complex variation on the mechanical parameters of RCCD. It is difficult to obtain accurately the mechanical parameters and inter- face thickness. In this paper, aiming at small difference of elastic modulus and creep among adjacent com- pacted layers, the determination method of the zone-merged age in RCCD is firstly studied, then consider- ing the gradual change property of RCC in space, the elastic calculation parameter analysis model of typi- cal roller compacted layer is established by using compound material mechanics, and the elastic calculation parameter analysis model of zone-merged body is established using zone-merged algorithm. Finally, on the basis of back analysis of zone-merged equivalent elastic mechanical parameters of RCCD, elastic gradual change parameters of RCCD are solved by using particle swarm optimization algorithm. The engineering ex- ample shows that the proposed method is feasible and effective