舟曲锁儿头滑坡滑带土微结构的分形研究

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摘要以锁儿头滑坡滑带土为研究对象，通过室内试验对其物理力学特性进行了测试，并基于分形理论，结合图像分析处理软件得到的微结构定量化数据，采用面积 - 周长法对滑带土的孔隙微观结构进行了分形研究，探讨了图像放大倍数和阀值对分形维数的影响，并据此制定了扫描电镜图像的处理标准。研究结果表明，锁儿头滑坡滑带土孔隙微观结构具有明显的分形特征，论述了孔隙形态分维数与孔隙比和抗剪强度指标间的相关关系，即孔隙形态分维数越大，土体孔隙比越小，土体强度越大，反之孔隙形态分维数越小，孔隙比越大，土体强度越小。这为以微结构分形维数来表征土体的力学性质及预测土体的力学行为提供了一定的参考依据。

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	宋丙辉
	谌文武
	吴玮江
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关键词 ：锁儿头, 滑带土, 物理力学性质, 微结构, 分形分维

Abstract：The microstructure fractal of sliding zone soil of Suoertou landslide is studied. The sliding zone soil is tested for physical-mechanical properties through the laboratory tests, then by use of the scan electronic microscope technique (SEM), the image-processing-analysis and computer-vision technique, the microstructure fractal parameters of soil pores are extracted based on the fractal geometry and the perimeter-area method. The influences of the threshold and magnification on the quantitative results of soil microstructure are investigated, and the standard of image processing is determined according to them. The results show that the sliding zone soil of Suoertou landslide is marked by fractal. Finally the relationship among fractal dimension, void ratio and shear strength of soil is expounded, indicating that the shear strength increases and the void ratio decreases with the increase of the fractal dimension, and vice versa. It provides a reference basis for forecasting the mechanical behaviors of soil by its microstructure fractal parameters.

Key words： Suoertou sliding zone soil physico-mechanical property microstructure fractal dimension

收稿日期: 2011-04-27

TU411.92

作者简介: 宋丙辉 ( 1986 – ) ，男，山东枣庄人，硕士研究生，从事岩土工程方面研究。

引用本文:

宋丙辉, 谌文武, *, 吴玮江, 江耀, . 舟曲锁儿头滑坡滑带土微结构的分形研究[J]. 岩土工程学报, 2011, 33(zk1): 292-297. SONG Bing-hui, CHEN Wen-wu , WU Wei-jiang, JIANG Yao, . Microstructure fractal of sliding zone soil of Suoertou landslide in Zhouqu. Chinese J. Geot. Eng., 2011, 33(zk1): 292-297.

链接本文:

http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2011/V33/Izk1/292

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