【摘要】 密度是影响粗颗粒材料动力特性的重要因素。随着密度值的提高,粗颗粒材料的最大动弹性模量产生一定的增加,但增加率随着围压的提高呈逐渐减弱的趋势;随着密度值的提高,粗颗粒材料在动荷载作用下的初次动轴向永久变形降低的较明显,后期随着振次的增加,动永久轴向变形呈逐渐收敛趋势,密度值的提高对动轴向永久变形的影响要明显大于对体积变形的影响。因此,对于高土石坝工程来说,提高压实标准有利于改善粗颗粒材料的力学特性,控制坝体的整体变形即提高其抗震性能。更多还原

【Abstract】 The density is an important factor for the dynamic properties of coarse aggregate. With the in-crease of its density,the largest dynamic elastic modulus of coarse aggregate has a certain increase,howev-er,the increment ratio exhibits a gradual decrease tendency with the increase of the confining pressure.With the increasing density,the initial dynamic axial permanent deformation of coarse aggregate under dy-namic loads has obvious decrease,and it shows a gradual convergence tendency at the late stage with theincrease of vibration number. The influence of the increasing density on the dynamic axial permanent defor-mation of coarse aggregate is obviously larger than that on the volume change. Accordingly,for high earth-rock dams,to raise compactness standard is beneficial to improving the mechanical properties of coarse ag-gregate,controlling the integrated deformation of dams and raising their seismic performance.更多还原