基于小波变换的数字图像技术在堆积体模拟中的应用

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摘要基于小波变换与Gamma校正提出一种新的数字图像处理技术，将其应用于堆积体的离散元模拟，可实现数值模型快速、准确的建立。该技术先基于二维小波理论对数字图像进行消噪预处理，并采用自适应Gamma校正方法以消除不同光照和环境对图像的影响，最后进行色彩空间转换以实现二值化处理，针对整个数字图像处理过程自行开发Wavelet-Gamma-Conversion(WGC)自动建模程序，可实现对堆积体图像的信息获取、分析处理并自动生成细观建模文件的全过程，为堆积体力学行为的模拟提供新的建模方法。以澜沧江古水水电站堆积体边坡为例，对实拍数码照片采用WGC建立其细观模型，运用双轴压缩数值模拟实验对其力学特性进行分析和研究。研究表明，堆积体中碎块石与土体相互压密形成共同受力体承担外力作用，由于碎块石的影响，出现明显的应变硬化阶段；随着土颗粒间黏结强度的提高，堆积体的初始弹性模量和峰值强度都有所提高。数值模拟反映出的规律与室内实验结果相一致。

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关键词 ：土力学, 堆积体, 数字图像处理, 离散元, 小波变换, 细观力学

Abstract：Based on the wavelet transform and Gamma correction，a new digital image processing technology (DIPT) is proposed. Then it is applied to the discrete element simulation of talus deposit；the numerical model can be established fast and correctly. As for the technology，the two-dimensional wavelet theory is used for the denoising of digital image，then the adaptive Gamma correction method is adopted to eliminate the impact of different lights and environments，and finally，the color space is conversed for the binary treatment. Based on the study of DIPT，a Wavelet-Gamma-Conversion(WGC) auto-modeling program is developed. It is able to realize the whole process：acquiring the information，analyzing and processing，establishing the micro-model files. A new modeling method is developed for the mechanical behavior simulation of talus deposit. As an example，some talus deposit data of Gushui hydropower station is used；and then the micromodel is established by the WGC from the digital photo on-site. The mechanical properties are studied by the numerical simulation of biaxial compression test. The results show that the gravels and soil mass compress with each other to form a corporate load-carrying body for sharing the external forces. The stress-strain curves show a strain-hardening stage evidently due to the impact of gravels. With the increasing of bond strength between soil particles，the initial elastic modulus and peak strength of talus deposit go up at a certain level. The law of the numerical simulation test is in agreement well with the results of laboratory test.

Key words： soil mechanics talus deposit digital image processing technology(DIPT) discrete elements wavelet transform mesomechanics

收稿日期: 2010-12-22

引用本文:

徐安权1，2，徐卫亚1，2，石崇1，2. 基于小波变换的数字图像技术在堆积体模拟中的应用[J]. 岩石力学与工程学报, 2011, 30(5): 1007-1015.
XU Anquan1，2，XU Weiya 1，2，SHI Chong1，2. APPLICATION OF DIGITAL IMAGE TECHNOLOGY TO SIMULATION OF TALUS DEPOSIT BASED ON WAVELET TRANSFORM. , 2011, 30(5): 1007-1015.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I5/1007

[16]	丁秀丽，李耀旭，王新. 基于数字图像的土石混合体力学性质的颗粒流模拟[J]. 岩石力学与工程学报，2010，29(3)：477-484. (DING Xiuli，LI Yaoxu，WANG Xin. Particle flow modeling mechanical properties of soil and rock mixtures based on digital image[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(3)：477-484.(in Chinese))
[6]	徐文杰，胡瑞林，岳中琦，等. 土石混合体细观结构及力学特性数值模拟研究[J]. 岩石力学与工程学报，2007，26(2)：301-311.(XU Wenjie，HU Ruilin，YUE Zhongqi，et al. Mesostructural character and numerical simulation of mechanical properties of soil-rock mixtures[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(2)：301-311.(in Chinese)) " target="_blank">
[2]	丁秀美，黄润秋，严明，等. 澜沧江中游某崩塌堆积体变形空间效应研究[J]. 中国地质灾害与防治学报，2004，15(3)：38-42.(DING Xiumei，HUANG Runqiu，YAN Ming，et al. Spatial effects of the deformation of a debris on the middle-reach of Lancang River[J]. The Chinese Journal of Geological Hazard and Control，2004，15(3)：38-42.(in Chinese)) " target="_blank">
[3]	程谦恭，张倬元，崔鹏. 平卧“支撑拱”锁固滑坡动力学机制与稳定性判据[J]. 岩石力学与工程学报，2004，23(17)：2 855-2 864. (CHENG Qiangong，ZHANG Zhuoyuan，CUI Peng. Dynamical mechanism and stability criterion of landslide under lockup of soil arching[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(17)：2 855-2 864.(in Chinese)) " target="_blank">
[1]	陈红旗，黄润秋，林峰. 大型堆积体边坡的空间工程效应研究[J]. 岩土工程学报，2005，27(3)：323-328.(CHEN Hongqi，HUANG Runqiu，LIN Feng. Study on the spatial engineering effect of larger accumulation slope[J]. Chinese Journal of Geotechnical Engineering，2005，27(3)：323-328.(in Chinese))
[4]	廖秋林，李晓，朱万成，等. 基于数码图像土石混合体结构建模及其力学结构效应的数值分析[J]. 岩石力学与工程学报，2010，29(1)：156-162.(LIAO Qiulin，LI Xiao，ZHU Wancheng，et al. Structure model construction of rock and soil aggregate based on digital image technology and its numerical simulation on mechanical structure effects[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(1)：156-162.(in Chinese)) " target="_blank">
[5]	于庆磊，唐春安，唐世斌. 基于数字图像的岩石非均匀性表征技术及初步应用[J]. 岩石力学与工程学报，2007，26(3)：551-559.(YU Qinglei，TANG Chun?an，TANG Shibin. Digital image based characterization method of rocks heterogeneity and its primary application[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(3)：551-559.(in Chinese))
[7]	LEBOURG T，RISS J，PIRARD E. Influence of morphological characteristics of heterogeneous moraine formations on their mechanical behaviour using image and statistical analysis[J]. Engineering Geology，2004，73(1/2)：37-50. " target="_blank">
[8]	REID T R，HARRISON J P. A semi-automated methodology for discontinuity trace detection in digital images of rock mass exposures[J]. International Journal of Rock Mechanics and Mining Sciences，2000，37(7)：1 073-1 089. " target="_blank">
[9]	YUE Z Q，CHEN S，THAM L G. Finite element modeling of geomaterials using digital image processing[J]. Computers and Geotechnics，2003，30(5)：375-397.
[10]	岳中琦，陈沙，郑宏，等. 岩土工程材料的数字图像有限元分析[J]. 岩石力学与工程学报，2004，23(6)：889-897.(YUE Z Q，CHEN Sha，ZHENG Hong，et al. Digital image processing based on finite element method for geomaterials[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(6)：889-897.(in Chinese))
[11]	彭召意，周玉，吴志辉. 彩色人体图像的二值化方法[J]. 计算机工程与设计，2010，31(6)：1 366-1 368.(PENG Zhaoyi，ZHOU Yu，WU Zhihui. Binarization approach of color human images[J]. Computer Engineering and Design，2010，31(6)：1 366-1 368.(in Chinese)) " target="_blank">
[12]	FARID H. Blind inverse gamma correction[J]. IEEE Transactions on Image Processing，2001，10(10)：1 428-1 433. " target="_blank">
[13]	岂兴明，王占富. MATLAB7.0程序设计快速入门[M]. 北京：人民邮电出版社，2009：165-175.(QI Xingming，WANG Zhanfu. Quick learning of MATLAB7.0[M]. Beijing：People?s Posts and Telecom Press，2009：165-175.(in Chinese)) " target="_blank">
[14]	徐泳，孙其诚，张凌，等. 颗粒离散元法研究进展[J]. 力学进展，2003，33(2)：251-260.(XU Yong，SUN Qicheng，ZHANG Ling，et al. Advances in discrete element methods for particulate materials[J]. Advances in Mechanics，2003，33(2)：251-260.(in Chinese))
[15]	徐文杰，胡瑞林，王艳萍. 基于数字图像的非均质岩土材料细观结构PFC2D模型[J]. 煤炭学报，2007，32(4)：358-362.(XU Wenjie，HU Ruilin，WANG Yanping. PFC2D model for mesostructure of inhomogeneous geomaterial based on digital image processing[J]. Journal of China Coal Society，2007，32(4)：358-362.(in Chinese))
[17]	徐卫亚. 澜沧江古水水电站争岗滑坡堆积体稳定性及防治研究[R]. 南京：河海大学，2010.(XU Weiya. Study on stability and prevention of the Zhenggang landslide in Lancang River Gushui Hydropower Station[R]. Nanjing：Hohai University，2010.(in Chinese)) " target="_blank">