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《Chinese Journal of Engineering》 2017-12
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Stylolite fractal characteristics and the influence of stylolite on strength of limestone

LU Jian-tao;XU Tao;Patrick Baud;YANG Tian-hong;ZHOU Guang-lei;CHEN Chong-feng;Centre for Rock Instability & Seismicity Research,Northeastern University;Institute of Rock Deformation,University of Strasbourg;  
To study the fractal characteristics of stylolite and its influence on the strength of limestone,the fractal dimension of horizontal stylolite and vertical stylolite was analyzed using the power spectral density method and the digital image box dimension method based on digital image processing technology. The influence of the stylolite on the limestone strength and the crack evolution process of the limestone were studied through experimental tests and numerical simulations. The results show that the fractal dimension of stylolite lies between 1 and 2,indicating that the stylolite is a self-affine fractal structure in nature,and the vertical stylolite has a large roughness. The stylolite weakens the strength of limestone by about 20% on average,the strength of limestone with different inclinations of stylolite shows less obvious anisotropy and stylolite has negligible effect on the elastic modulus of limestone. In the failure process of limestone,crack initiation and propagation in limestone is closely related to the stylolite,and the stylolite accelerates the damage and failure of the limestone. Numerical simulations show that the thickness,position,numbers,and fractal dimension of the stylolite have significant effect on the strength of the limestone.
【Fund】: 国家重点基础研究发展规划资助项目(2014CB047100);; 国家自然科学基金资助项目(41672301 51474051);; 中央高校基本科研业务费资助项目(N150102002);; 中法蔡元培资助项目(36605ZB)
【CateGory Index】: TP391.41;TU45
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