粗颗粒土级配混合法缩尺后力学性质变化规律研究

摘要

In order to study the effect of the maximum particle size on the strength and deformation of the coarse grained soil by the mixing method,the scale of the rockfill grading of a rockfill dam was adopted,and the test material of the scale was adjusted according to the maximum particle size.The difference was divided into 4 groups.The triaxial drainage shear test of the conventional reciprocating pressure was carried out on the large triaxial instrument,and the scale and deformation were studied.The results showed that the peak elasticity increases with the increase of the maximum particle size,and the initial elastic modulus increases with the increase of the maximum particle size.The change of the internal friction angle decreases first and then increases.In a certain range,the Duncan model parameter K increases with the maximum particle size,and the modulus number n decreases with the increase of the maximum particle size,and the maximum particle size is linearly related to K and n.%为了研究粗颗粒土经混合法缩尺后最大粒径对强度和变形的影响,对某堆石坝堆石料级配采用混合法进行缩尺,级配缩尺后的试验替代料根据最大粒径的不同分为4组.在大型三轴仪上进行了试验替代料的常规各向等压固结的三轴排水剪试验,研究了强度和变形的缩尺效应.试验结果表明:峰值偏应力随着最大粒径的增大而增大;初始弹性模量随着最大粒径的增大而增大;内摩擦角的变化规律为先减小后增大;在一定范围内,邓肯模型参数K随着最大粒径的增大而增大,模量数n随着最大粒径的增大而减小,最大粒径与K和n近似于线性关系.