三轴冲击荷载作用前后软黏土的微观结构变化研究

摘要

利用SPAX-2000改进型静动真三轴测试系统进行了软黏土冲击试验，借助扫描电子显微镜观测技术获取了软黏土微观结构图像；提取了孔隙个数、孔隙总面积、面积分级、孔隙总周长、平均孔径、圆度、形状系数和各向异性率共8个微观结构参数；对比了冲击荷载作用前后的微观结构参数变化。研究结果表明，冲击荷载作用下微观结构参数呈现一定的规律变化，该研究成果可为动力排水固结法处理软土地基提供微观理论依据。%In this paper the impact tests of soft clay have been done by using static-dynamic-true triaxial test system of modified SPAX-2000.With the help of scanning electron microscope ( SEM) technology, the microstructural images of the soft clay , and eight microstructural parameters including the number of pore, total area, the classification of area, total perimeter, the average diameter, the roundness, the shape coefficient and the anisotropy have been obtained .And the changes of microstructural parameters before and after impact load have been analyzed .The results show that the microstructural parameters un-der impact load have certain rules of change .The study can provide microscopic theory basis for dynamic drainage consolidation method of soft ground engineering design .