黄土震陷变形特征的细观分析
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摘要
黄土在我国广泛分布,黄土的震陷性是黄土地区的主要灾害之一。本课题将黄土的震陷变形特征与微观结构特征有机地结合起来,分析土结构性在地震荷载作用下的变形破坏机理。通过电镜扫描分析手段,对Q3震陷性黄土的微结构特征、颗粒形态等进行了分析,探讨了中大孔隙对黄土震陷的影响,揭示了黄土的显微结构与震陷系数及震陷的临界动应力的关系。
Loess is distributed widely in China and the seismic subsidence is one of the major disasters in loess areas. In this study,the subsidence deformation characteristics of loess structure under earthquake loading are organically combined with the microstructure characteristics. By electronic-microscope scanning,the microstructure and grain shape of loess are analyzed,the influence of middle-large pores on loess seismic subsidence is discussed,and the relationships among microstructure,seismic subsidence coefficient and critical dynamic stress of loess are disclosed.
Loess is distributed widely in China and the seismic subsidence is one of the major disasters in loess areas. In this study,the subsidence deformation characteristics of loess structure under earthquake loading are organically combined with the microstructure characteristics. By electronic-microscope scanning,the microstructure and grain shape of loess are analyzed,the influence of middle-large pores on loess seismic subsidence is discussed,and the relationships among microstructure,seismic subsidence coefficient and critical dynamic stress of loess are disclosed.
引文
1胡瑞林.粘性土微结构定量模型及其工程地质特征研究[M].地质出版社,1995
2廖胜修.黄土显微结构的区域性变化与湿陷性的关系[A].见:中国黄土分类、定名及应用研讨会论文集[C].西安:陕西人民教育出版社,1990,144～154
3李兰.兰州震陷性黄土的地震工程特性与震害预测[A].见:第四届全国地震工程会议论文集[C].兰州 :[s.n.],1994,55～59
4张振中,段汝文.黄土震陷研究与震害研究[J].西北地震学报,1987,l9(增):14～18
5高国瑞.黄土显微结构分类与湿陷性[J].中国科学,1980,(12):1203～1208
2廖胜修.黄土显微结构的区域性变化与湿陷性的关系[A].见:中国黄土分类、定名及应用研讨会论文集[C].西安:陕西人民教育出版社,1990,144～154
3李兰.兰州震陷性黄土的地震工程特性与震害预测[A].见:第四届全国地震工程会议论文集[C].兰州 :[s.n.],1994,55～59
4张振中,段汝文.黄土震陷研究与震害研究[J].西北地震学报,1987,l9(增):14～18
5高国瑞.黄土显微结构分类与湿陷性[J].中国科学,1980,(12):1203～1208
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