堆石料变形与强度特性的大型三轴试验研究

LARGE-SCALE TRIAXIAL TEST STUDY ON DEFORMATION AND STRENGTH CHARACTERISTICS OF ROCKFILL MATERIALS

在两种堆石料饱和试样大三轴试验成果的基础上,对其变形与强度特性变化规律进行了总结。给出了其应力-应交关系、侧向应变与轴向应变关系的指数关系表达式,以及抗剪强度包络线q-p面上的幂函数表达式:探讨了试验现象的内在机理;分析了剪胀、破碎与颗粒重排的相互关系;提出了弹性剪胀和塑性剪胀相互转化的观点。

The test results of two rockfill samples are obtained with large-scale testing equipment. Based on these results, some useful conclusions are drawn from the analysis of deformation in each direction and shear strength properties of the rockfills. Thus, the exponent formulations of the relationship between deviator stress and axial strain or lateral strain and axial strain are proposed, respectively. Besides, the failure envelopes of rockfills in the coordinate plane of octahedral shear stress and octahedral normal stress also can be described by the exponent formulation. At the same time, the inherent mechanism of experimental phenomena is discussed. The relations among dilation, particle breakage and rearrangement are analysed, and the concept of reciprocal transformation of elastic dilatancy and plastic dilatancy is put forward.