【摘要】 本文以1995年甘肃省境内5.8级地震引起的黄土地区震陷灾害实例,对黄土微结构孔隙性进行了定量研究。通过电镜扫描手段和SEM图像处理技术,对极震区震陷性黄土微观结构的各项指标进行了比较分析,得出不同地点的黄土孔隙分布曲线;对极震区受地震破坏和未受破坏典型架空孔隙结构的黄土进行了定量处理,较好地解释了土体的工程性质,结合激光粒度分析仪对极震区黄土进行了测量和统计分析。同时对无震区与强震区黄土孔隙分布曲线进行了对比研究。结果表明:不同极震区的孔隙分布特征不同,同一深度不同区域孔隙分布曲线亦有明显的差异。更多还原

【Abstract】 In order to give loess micro-structure quantitative analysis, many cases of seismic subsidence disaster in the 1995 Yongdeng MS 5.8 earthquake are discussed. Using scanning electronic microscope, the SEM image manipulation technique, comparison on each factor of loess micro-structure of seismic subsidence in the magistoseidmic area, curves of pore distribution of loess in different site are obtained; Loess with trellis structure pores in intense seismic area compared with that of non-seismic area, this quantitative analysis explain the loess engineering feature well. The measure and statistic on Laser-granularity analysis of loess are associatively done in the study. Then the curves of pore distribution in intense seismic area compared with that of non-seismic area. The result shows that the character of pore distribution in different magistoseismic areas is different; and there are many differences in the same deepness curves of pore distribution in different sites.更多还原