夹岩水利枢纽工程面板坝主堆石料缩尺规律研究

Scaling laws of main rockfill materials for the panel dam of Jiayan Water Conservancy Hub Project

本文以夹岩水利枢纽工程面板堆石坝的主堆石料为研究对象,考虑堆石料破碎及强度尺寸效应建立堆石料随机不连续变形数值模型,研究堆石料缩尺变形规律和变化范围。首先,采用300mm×600mm尺寸的数值试样模拟室内三轴剪切试验,率定细观参数;然后,生成原级配尺寸的数值试样,采用率定的细观参数进行常规三轴数值剪切试验,研究分析原级配堆石料的力学特性;最后,对比以上两个尺寸的试验成果,研究堆石料力学参数缩尺规律,为高面板堆石坝的典型分区材料参数选取提供依据。

This paper focuses on the main rockfill materials of the Jiayan Water Conservancy Hub Project’s rockfill dam.Considering the fragmentation and strength size effects of the rockfill,a stochastic discontinuous deformation numerical model is established to study the deformation laws and ranges of the rockfill materials under scale reduction.First,a numerical specimen of size 300mm×600mm is used to simulate indoor triaxial shear tests and calibrate the mesoscopic parameters.Next,a numerical specimen of the original graded size is generated,and conventional triaxial numerical shear tests are conducted using the calibrated mesoscopic parameters to analyze the mechanical properties of the original graded rockfill.Finally,the results of the two different sizes are compared to investigate the scaling laws of the mechanical parameters of the rockfill,providing a basis for selecting typical material parameters for high rockfill dams.