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中文摘要：
为满足土石坝抗震设计的需要,并研究粗粒料在地震作用下的变形机理和特性,采用大型三轴试验机对粗粒料分别进行了偏应力和球应力往返加载试验,研究了粗粒料在偏应力和球应力往返加载条件下的变形特性。试验结果表明：粗粒料在偏应力和球应力往返加载条件下的变形可分为往复变形和残余变形两部分,变形与试验的振次、围压、动应力比等因素有关;在偏应力往返加载条件下,往复体应变总为负数,在一个加载周期中,随着剪应力的周期性变化,往复体应变两次达到剪胀最大值。
英文摘要：
A series of large-scale cyclic triaxial tests were performed to improve earthen dam seismic designs by studying the deformation mechanism and characteristics of coarse-grained materials during earthquakes. The tests studied the deformation characteristics of coarse-grained materials during cyclic loading of the deviatoric and spherical stresses. The results indicate that the deformation of the coarse-grained materials results from reciprocating deformation and residual deformation related to the cyclic loading time, confining pressure, and dynamic stress ratio. The reciprocating volumetric strain is always negative and twice reached the maximum dilatation during the cyclical changes of the deviatoric stress over each loading cycle.
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