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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。
In order to meet the need of seismic design of earth-rockfill dam, and to study the deformation mechanism and characteristics of coarse-grained material under earthquake action, a large-scale triaxial testing machine was used to carry out the deviatoric and spherical stress reciprocating loading tests on coarse aggregate. Deformation properties of materials under cyclic loading of deviator stress and ball stress. The test results show that the deformation of coarse aggregate under the cyclic loading of deviatoric stress and spherical stress can be divided into two parts: reciprocating deformation and residual deformation. The deformation is related to the test vibration frequency, confining pressure and dynamic stress ratio. Reciprocating body strain is always a negative number under the reciprocating loading condition. In a loading cycle, with the periodic change of shear stress, the reciprocating body strain reaches the maximum dilatancy twice.