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基于压缩试验的细观观测,研究了土体宏观力学性状和颗粒细观参数的定量关系。通过对单调压缩荷载下砂土颗粒的运动分析,研究了砂土颗粒的长轴L、短轴B、y轴投影长度、形心x坐标与形心y坐标5个细观力学指标与宏观力学性状孔隙比的关联,提出细观力学参数与孔隙比的量化计算式。依据中砂半模压缩试验结果修正了量化计算式,砂样顶面圆心处#1观测点的计算孔隙比e小于砂样底面圆心处#2观测点的e;砂样1/2高度水平面上,环刀与砂样中轴线间距离的中点#3观测点的e小于环刀内侧壁处#4观测点的e,根据计算结果绘出各观测点的e–p曲线。各观测点的计算孔隙比表明,观测点位置影响了颗粒运动及孔隙比变化。通过对砂土细观力学性状与孔隙比之间关联度的试验研究,从散体细观力学出发,提出了一种基于试验的土体宏、细观力学性状相关联的研究方法。
Based on the mesoscopic observation of the compression test, the quantitative relationship between the macroscopic mechanical properties of soil and the mesoscopic parameters of the particles was studied. Through the movement analysis of sand particles under monotonic compression load, the five meso-mechanics indexes such as the long axis L, the short axis B, the y-axis projection length, the centroid x-coordinate and the centroid y-coordinate of the sand particles are studied. The relationship between porosity and traits was proposed, and the numerical calculation formula of mesomechanical parameters and void ratio was proposed. Based on the results of half-mold compression test of mid-sand, the quantification formula was corrected. The calculated void ratio e of observation point # 1 at the center of the top surface of the sand sample was smaller than e at the observation point # 2 of the bottom surface of the sand sample. , E of the observation point at the middle point # 3 of the distance between the centerline of the ring knife and the sand sample is smaller than the observation point # 4 of the inner side wall of the torus knife, and the e-p curve of each observation point is plotted according to the calculation result. The calculated void ratio at each observation point shows that the location of the observation point affects particle movement and void ratio changes. Based on the experimental study of the correlation between the microscopic mechanical properties of sand and the void ratio, a method based on experimental micromechanics is proposed based on experimental micromechanics.