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Rock and Soil Mechanics

Hong-wei LIU, School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China; Academician Workstation of Mine Safety and Underground Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China; Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, ChinaFollow
Shi-jiang CHEN, School of Mining and Mechanical Engineering, Liupanshui Normal University, Liupanshui, Guizhou 553004, China
You-jun XU, School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China; Academician Workstation of Mine Safety and Underground Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China; Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China
Xu ZHANG, School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China; Academician Workstation of Mine Safety and Underground Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China; Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China
Xian-kai BAO, School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China; Academician Workstation of Mine Safety and Underground Engineering, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China; Engineering Research Center of Urban Underground Engineering at Universities of Inner Mongolia Autonomous Region, Inner Mongolia University of Science and Technology, Baotou, Inner Mongolia 014010, China

Abstract

The reconstruction of rock mass fracture is crucial for accurately constructing fracture rock mass model and obtaining its mechanical properties. To ensure the reconstructed fractures fit the natural state, this paper first proposed the D-nmax threshold formula and modified the Weierstrass-Mandelbrot (W-M) function used in rock mass fracture simulation. Barton’s 10 profile lines were digitized using binarized gray images, and Hurst values for 10 roughness levels were determined using the equi-difference method, trial and error method and comprehensive analysis method. The new parameter Spp, representing the magnitude feature, is obtained by Fourier transforming the 10 profile lines. The parameter Spp is then combined linearly with the standard deviation of the angle σi to construct a new joint roughness coefficient (JRC) calculation formula. The optimal scaling constant G value corresponding to the target JRC value is obtained using the dichotomy method, establishing the mapping relationship between JRC and the W-M function. The W-M function considers random terms and realizes the differentiation of reconstructed fractures. The roughness quantification research and laboratory tests are conducted to verify the validity of the new parameter Spp, the new JRC formula, and the mapping relationship. This study provides a new approach for expanding the method of obtaining fracture in rock mass, and lays the foundation for studying the mechanical properties of fractured rock mass.

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