黄土的震陷性与其微结构特征的关系研究

STUDY ON THE RELATION OF LOESS SEISMIC SUBSIDENCE AND ITS MICROSTRUCTURE CHARACTERS

摘要:

借助电镜扫描分析手段,对Q₃震陷性黄土的微结构特征、颗粒形态等进行了分析.结果表明黄土的显微结构对震陷系数有较大影响,并与震陷的临界动应力关系密切.通过孔隙含量的定量测试分析,探讨了中大孔隙对黄土震陷影响,并对土样的微结构某些指标进行了比较和分析.

Abstract:

The seismic subsidence is one of major disasters in loess areas in China. The deformation mechanics of loess structure under earthquake loading are analyzed. By using electronic-microscope scanning, microstructure and grain shape of Q₃ loess, which has seismic subsidence property, are studied. It indicate that the microstructure of loess has great influence not only to the seismic subsidence coefficient, but also to the critical dynamic stress. Through the quantitative test analysis of pore content, the influence of middle-large pores on loess seismic subsidence is discussed and some items of loess samples' microstructure are compared and analyzed.