黄土震陷时微观结构随动应力变化分析
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摘要
通过黄土微观结构图像的处理可以很好地提取黄土微观结构要素。本文取通渭老地震区的黄土做震陷实验,应用土体微观结构定量分析系统对不同正弦荷载下震陷土样的微结构图片作定量化结构效应分析,探讨了其不同动应力荷载下的微观结构参数变化规律,并建立了各参数与动应力的对应关系。结果表明,黄土震陷由其微观结构及外部荷载共同决定,各微观要素在震陷过程中有不同变化,孔隙的有效直径、孔径分维、连通率和颗粒定向度的微结构参数变化与残余变形变化基本保持一致。
Loess's microstructural parameters could be obtained well by dealing with the microstructural image.Based on the seismic subsidence experiment of loess samples taken from the Tongwei old earthquake area,we count the microstructural parameters,research the orderliness of microstructural parameters variety corresponding to different sine wave dynamic stress values and find the relation between the microstructural parameters and the dynamic stress using the soil microstructual quantitative analysis system.It appears that seismic subsidence of loess depends on its microstructure and external stress state.All microstructural parameters hold different variety in the seismic subsidence process of loess.Among them the variety of effective diameter of trellis pores,pore diameter dimension,connectivity and granule beamed degree is in conformity with the variety of residual deformation of loess.
Loess's microstructural parameters could be obtained well by dealing with the microstructural image.Based on the seismic subsidence experiment of loess samples taken from the Tongwei old earthquake area,we count the microstructural parameters,research the orderliness of microstructural parameters variety corresponding to different sine wave dynamic stress values and find the relation between the microstructural parameters and the dynamic stress using the soil microstructual quantitative analysis system.It appears that seismic subsidence of loess depends on its microstructure and external stress state.All microstructural parameters hold different variety in the seismic subsidence process of loess.Among them the variety of effective diameter of trellis pores,pore diameter dimension,connectivity and granule beamed degree is in conformity with the variety of residual deformation of loess.
引文
[1]吴义祥.工程黏性土微观结构定量分析[J].中国地质科学院院报,1991,23:143-153.
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[3]施斌,李生林.黏性土微观结构SEM图像的定量研究[J].中国科学(A辑),l995,25(6):666-672.
[4]石玉成,李兰,刘红玫.黄土的震陷性与其微结构特征的关系研究[J].西北地震学报,2002,24(2):129-134.
[5]胡瑞林.黏性土微结构定量模型及其工程地质特征研究[M].北京:地质出版社,1995.
[6]徐舜华,王兰民,袁中夏.黄土震陷初判指标的界定研究[J].西北地震学报,2006,28(2):140-143.
[7]何丽君,石玉成,杨惠林,等.地震动作用下黄土边坡稳定性分析[J].西北地震学报,2009,31(2):142-147.
[8]张晁军,石耀霖,黄建平.粘弹性分层和重力作用对地震形变场数值模拟的影响[J].西北地震学报,2008,30(3):201-207.
[2]张礼中,胡瑞林,李向全.土体微观结构定量分析系统及应用[J].地质科技情报,2008,27(1):163-170.
[3]施斌,李生林.黏性土微观结构SEM图像的定量研究[J].中国科学(A辑),l995,25(6):666-672.
[4]石玉成,李兰,刘红玫.黄土的震陷性与其微结构特征的关系研究[J].西北地震学报,2002,24(2):129-134.
[5]胡瑞林.黏性土微结构定量模型及其工程地质特征研究[M].北京:地质出版社,1995.
[6]徐舜华,王兰民,袁中夏.黄土震陷初判指标的界定研究[J].西北地震学报,2006,28(2):140-143.
[7]何丽君,石玉成,杨惠林,等.地震动作用下黄土边坡稳定性分析[J].西北地震学报,2009,31(2):142-147.
[8]张晁军,石耀霖,黄建平.粘弹性分层和重力作用对地震形变场数值模拟的影响[J].西北地震学报,2008,30(3):201-207.
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