堆石坝的筑坝材料粗粒料通常占半数以上,准确地掌握粗粒的抗剪强度及动力变形等基本特性,对确定堆石坝经济合理的设计和施工方法至为重要,为此期望能得到接近原位状态的应力应变值。这样的原位静力和动力应力应变状态,只能在各种扭转纯剪试验和重复加荷扭转纯剪试验时出现,面在试验中伴随着侧向变形而产生的平面应变则无法完全再现。由于扭转纯剪试验的试件制作困难,而且以粗粒料为对象的试验多为大型试验,这样的试验实例很少。因此对粗粒料的抗剪强度,主要是用构造简单、得出的结果比较稳定的三轴压缩试 Rockfill dam damming material coarse aggregate usually account for more than half of the accurate grasp of the coarse shear strength and dynamic deformation of the basic characteristics of the rockfill dam to determine the economic and reasonable design and construction methods are of great importance to this expectation Can get close to the state of stress and strain values. Such in-situ static and dynamic stress-strain states can only occur during various purely torsional torsional tests and pure torsional shear tests with repeated loading and torsion. Plane strains resulting from lateral deformation with tests of the plane can not be reproduced completely . Due to the difficulty of making specimens for pure shear tests, most of the tests conducted on coarse aggregates are large-scale tests. Therefore, the shear strength of coarse aggregate, mainly with a simple structure, the results obtained relatively stable triaxial compression test