基于大型三轴试验的胶凝堆石料力学特性试验研究

胶凝堆石料作为一种新型筑坝材料,在坝工建设中具有广阔的应用前景,其材料性能介于堆石体材料和混凝土材料之间。通过开展胶凝堆石料的大型三轴试验,得到了不同龄期、不同围压下的应力-应变关系曲线,进而分析了龄期和围压对三轴受压破坏强度、体积变形以及龄期对抗剪强度的影响规律,并通过试验数据回归分析,得出胶凝堆石料破坏强度与围压和龄期、抗剪强度与龄期之间满足相关关系,为胶凝堆石料本构模型的建立和胶凝堆石坝的设计提供参考依据。

Study of mechanical properties of cemented sand and rockfill material based on large-scale triaxial tests

Cemented sand and rockfill (CSR) material is a new type of material for dam construction, with a wide application prospect. Its material properties lie between concrete and rockfill material. This paper presents strain-stress curves of CSR material under different confining pressures and ages obtained from a great number of large-scale triaxial tests, and describes the influences of these two factors, including variations in breaking strength and volumetric deformation with the factors and variation in shear strength with the age. A regression analysis of test data shows the correlation of breaking strength with confining pressure and age and the correlation of shear strength with age. The results would be useful for development of constitutive models and design of dams with CSR material.