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| APPLICATION OF DIGITAL IMAGE TECHNOLOGY TO SIMULATION OF TALUS DEPOSIT BASED ON WAVELET TRANSFORM |
| (1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering，Hohai University，Nanjing，Jiangsu 210098，China；2. Geotechnical Research Institute，Hohai University，Nanjing，Jiangsu 210098，China) |
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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.
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Received: 22 December 2010
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| [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))
[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))
[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))
[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))
[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))
[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))
[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.
[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.
[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))
[12] FARID H. Blind inverse gamma correction[J]. IEEE Transactions on Image Processing，2001，10(10)：1 428–1 433.
[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))
[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))
[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))
[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)) |
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2011, Vol. 30 
