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在砂砾料中掺入少量胶凝材料得到了一种新的低强度筑坝材料——Hardfill材料,其力学性能介于碾压混凝土和土石料之间,应力-应变关系具有明显的弹塑性性质和应变软化等特性。在已有研究的基础上,通过理论和数学分析,提出了能够反映Hardfill材料应变软化特性、参数物理意义较为明确的六参数非线性弹性本构模型,并给出了详细的参数确定过程。将该本构模型应用于坝高100m的Oyuk坝进行非线性有限元分析,结果表明:应用非线性本构模型计算所得坝体应力和变形分布规律与线弹性计算结果基本一致;因坝体应力水平较低,材料基本处于线弹性状态,非线性计算所得应力值与线弹性结果相差不大;而在坝趾等应力水平较高的部位,非线性计算所得应力集中值明显较小。
A new low-strength dam-forming material, Hardfill, is obtained by incorporating a small amount of cementitious material into the sand and gravel material. The mechanical properties of the material are between RCC and earth and stone, and the stress-strain relationship has obvious elastic-plastic properties And strain softening and other characteristics. Based on the existing research, the six-parameter nonlinear elastic constitutive model that reflects the strain softening properties of Hardfill material and the more explicit physical meaning of the parameters is proposed through theoretical and mathematical analysis. The detailed parameter determination process is also given. The constitutive model is applied to the nonlinear finite element analysis of Oyuk dam with a height of 100 meters. The results show that the calculated stress and deformation distribution of the dam using the nonlinear constitutive model are basically the same as the linear elastic calculation results. The material is in a linear elastic state, and the nonlinear calculated stress value is not much different from the linear elastic result. However, the non-linear calculated stress concentration value is obviously smaller in places with higher stress level such as the toe.