堆石料的压缩性直接关系工程的安全问题,对某一抽水蓄能电站坝体填筑料开展多组大型侧限压缩试验,结果表明,堆石料的压缩模量较大、压缩指数很小。只有在应力超过颗粒破碎应力以后堆石料压缩曲线才会发生较大程度的下降,且认为颗粒破碎应力是堆石料发生弹塑性变形的转折点,对于不同初始孔隙比的同一种堆石料,在极高的应力状态下它们的压缩曲线会聚到唯一的极限压缩曲线LCC。压缩曲线中堆石料的卸荷回弹量非常小,表明其是弹性变形。不论何种加载路径材料的初始级配决定了堆石料的最终压缩状态,且随着母岩强度的增加、初始孔隙比或者泥岩含量的减小堆石料的压缩性减小。
The compressibility of rockfill materials is directly related to the safety and stability of projects, therefore, a good many groups of large scale uniaxial-confined compression tests are carried out on the rockfill materials for a certain pumped storage power station. The experiment results show that the compressive moduli of rockfill materials are higher; and the compressive indexes are much lower. More compression deformation will happen when the stress on the internal grain exceeds the value sufficient for particle breakage; and this stress is regarded as the transitional point of elastoplastic deformation. Specimens of a given rockfill materials, which are compressed from different initial void ratios, converge on a unique limiting compression curve(LCC). Moreover, the unloading rebound deformation of rockfill materials is elastic deformation because the deformation quantity is very small and linear. The compression state of rockfill materials is determined by the gradation no matter what the loading paths are, and the compressibility will decrease while the strength of parent rock increases or the initial void ratio and the content of mudstone decrease.