【摘要】 结合紫坪铺、瀑布沟和密云土石坝工程，在大型动三轴试验机上（试样尺寸为φ300×750mm），通过往返加荷三轴试验，研究了堆石料和砂砾石料在非饱和状态、饱和排水状态及饱和不排水状态下的残余变形特性，探讨了粗位主料的密实度、饱水程度、排水条件、初始应力条件及往返加荷条件等对其残余变形特性的影响，并进行了对比分析，得出了一些有工程实用意义的结论。这些研究成果，可作为紫坪铺、瀑布沟和密云土石坝工程进行抗震设计和地展变形分析的基本依据，对其它工程也有重要的参考价值。更多还原

【Abstract】 The residual deformation characteristics of coarse-grained soils like rockfill materials and sandy gravels from Zipingpu,Pubugou and Miyun earth-rocktill dams have been studied by a series of large-scale cyclic triaxial tests (specimen size:φ30cm × 75cm) Under unsaturated , saturated-undrained, and saturated-drained conditions respectively. The effects of com-paction degree, saturation degree, drainage state, initial stress and cyclic loading conditions are discussed and compared.The test results show that the specimens with higher density, lower saturation degree, good drinage condition and highe con-fining pressure yield less residual deformation under cyclic stress. For this reaso, it is effective to take engineering measuresfor strengthning the seismic stability of earth-rockfill dams such as enhancing the compaction degree ofmaterials of earth-rock-fill dams, reducing their saturation scope and setting up well-drained conditions.更多还原