堆石料三轴固结排水剪切试验全过程颗粒破碎特性研究

Study on Particle Breakage Characteristics of Rockfill Materials in Whole Process of Triaxial Consolidation Drained Shear Test

为研究灰岩堆石料三轴固结排水剪切试验全过程的颗粒破碎特性,通过对不同初始孔隙率下制备试样、不同围压下固结试样、不同围压下三轴固结排水(CD)剪切破坏的试样进行筛分试验,研究了三轴CD剪切试验过程中制样、固结和剪切三个试验阶段的颗粒破碎特性。结果表明,剪切过程中的颗粒相对破碎率最大,固结过程的次之,制样过程的最小;制样过程中的颗粒相对破碎率随试样初始孔隙率的增大基本呈线性减小变化;固结过程中的颗粒相对破碎率随固结压力的增大呈线性增大变化,随试样初始孔隙率的增大基本呈线性减小变化;剪切过程中的颗粒相对破碎率随剪切围压的增大呈线性增大变化,随试样初始孔隙率的增大基本呈线性减小变化。

To research on the particle breakage characteristics of limestone rockfill material in the whole process of triaxial consolidation drainage shear test,through screening tests on samples with different initial porosity,consolidated samples under different confining pressures,and samples with triaxial consolidation drainage(CD)shear failure under different confining pressures,the particle breakage characteristics of three test stages of sample preparation,consolidation and shear in the process of triaxial CD shear test were studied.The results show that the relative breakage rate of particles in the shear process is the largest,followed by consolidation process,and the smallest in the sample preparation process;The relative particle breakage rate in the sample preparation process basically decreases linearly with the increase of the initial porosity of the sample;The relative breakage rate of the particles in the consolidation process increases linearly with the increase of the consolidation pressure,and is basically linear with the increase of the initial porosity of the sample.The relative crushing rate of particles increases linearly with the increase of shear confining pressure and decreases linearly with the increase of initial porosity.