高速铁路地基黄土液化前后微观结构变化研究
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摘要
目的对地基黄土液化前后的微结构变化进行研究,更好地认识黄土的动力性质及液化机理。方法以新建郑(州)—西(安)高速铁路为例,选择典型路段(华阴、潼关、灵宝和偃师等),采集大量原状黄土样品,进行动三轴液化试验。基于GIS软件对黄土液化试验前后的扫描电镜照片进行定量化数据提取和处理并进行分形研究。结果结果表明液化试验后黄土孔隙微结构具有分形特征,揭示了黄土分形分维同孔隙比之间有近似的直线关系。结论液化前黄土孔隙的分形维数明显大于液化后分形维数;区域上自西向东,孔隙分维都减少。
Aim By studying loess microstructure pre and post liquefaction of high-speed railway foundation to better recognize the dynamic properties and liquefaction mechanism of loess.Methods Taking four typical sections(Huayin,Tongguan,Lingbao,Yanshi) of Zhengzhou-Xi′an high speed railway as object,collecting sufficient loess samples,dynamic triaxial liquefaction tests have been carried out.Based on the fractal theory and image-processing techniques such as Photoshop,ArcView and ArcMap,loess SEM photos pre and post liquefaction have been processed and quantitative data were achieved.Results The result shows that the pore microstructure of loess has the character of fractal,and then the approximate line relationship between the fractal dimension and the void ratio is discussed.Conclusion Loess microstructure fractal dimension of pre-liquefaction is obviously higher than that of post-liquefaction,and zonely,the microstructure fractal dimension reduces from west to east.
Aim By studying loess microstructure pre and post liquefaction of high-speed railway foundation to better recognize the dynamic properties and liquefaction mechanism of loess.Methods Taking four typical sections(Huayin,Tongguan,Lingbao,Yanshi) of Zhengzhou-Xi′an high speed railway as object,collecting sufficient loess samples,dynamic triaxial liquefaction tests have been carried out.Based on the fractal theory and image-processing techniques such as Photoshop,ArcView and ArcMap,loess SEM photos pre and post liquefaction have been processed and quantitative data were achieved.Results The result shows that the pore microstructure of loess has the character of fractal,and then the approximate line relationship between the fractal dimension and the void ratio is discussed.Conclusion Loess microstructure fractal dimension of pre-liquefaction is obviously higher than that of post-liquefaction,and zonely,the microstructure fractal dimension reduces from west to east.
引文
[1]王家鼎,白铭学,肖树芳.强震作用下低角度黄土斜坡滑移的复合机理研究[J].岩土工程学报,2001,23(4):446-450.
[2]王家鼎,张倬元.黄土自重湿陷变形的脉动液化机理[J].地理科学,1999,19(3):271-276.
[3]王兰民.黄土动力学[M].北京:地震出版社,2003.
[4]王家鼎,张倬元.典型高速黄土滑坡群的系统工程地质研究[M].成都:四川科技出版社,1999.
[5]任权,王家鼎,袁中夏,等.高速铁路地基黄土微结构的分形研究[J].水文地质工程地质,2007,34(6):76-78.
[6]刘红玫,王兰民.饱和黄土液化的孔隙微结构特征[J].西北地震学报,2002,24(2):135-139.
[7]王宝军,施斌,刘志斌,等.基于GIS的黏性土微观结构的分形研究[J].岩土工程学报,2004,26(2):246-247.
[8]Mandelbrot B B.The Fractal Geometry of Nature[M].San Francisco:W HFreeman,1983.
[9]Moore C A,Donaldson C F.Quantifying soil microstruc-ture using fractals[J].Geotechnique,1995,45(1):105-116.
[10]王清,王剑平.土孔隙的分形几何研究[J].岩土工程学报,2000,22(4):496-498.
[11]谢和平.分形几何及其在岩土力学中的应用[J]岩土工程学报,1992,14(1):4-24.
[2]王家鼎,张倬元.黄土自重湿陷变形的脉动液化机理[J].地理科学,1999,19(3):271-276.
[3]王兰民.黄土动力学[M].北京:地震出版社,2003.
[4]王家鼎,张倬元.典型高速黄土滑坡群的系统工程地质研究[M].成都:四川科技出版社,1999.
[5]任权,王家鼎,袁中夏,等.高速铁路地基黄土微结构的分形研究[J].水文地质工程地质,2007,34(6):76-78.
[6]刘红玫,王兰民.饱和黄土液化的孔隙微结构特征[J].西北地震学报,2002,24(2):135-139.
[7]王宝军,施斌,刘志斌,等.基于GIS的黏性土微观结构的分形研究[J].岩土工程学报,2004,26(2):246-247.
[8]Mandelbrot B B.The Fractal Geometry of Nature[M].San Francisco:W HFreeman,1983.
[9]Moore C A,Donaldson C F.Quantifying soil microstruc-ture using fractals[J].Geotechnique,1995,45(1):105-116.
[10]王清,王剑平.土孔隙的分形几何研究[J].岩土工程学报,2000,22(4):496-498.
[11]谢和平.分形几何及其在岩土力学中的应用[J]岩土工程学报,1992,14(1):4-24.
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