rock mechanics,high stress,unloading,fractal geometry,scanning electron microscope,"/> Study of micro-mesoscopic characteristics of marble fracture surface and correlation with unloading rock mass strength under high stress and unloading

›› 2012, Vol. 33 ›› Issue (S2): 7-016.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study of micro-mesoscopic characteristics of marble fracture surface and correlation with unloading rock mass strength under high stress and unloading

HUANG Da1, 2, 3，TAN Qing1，HUANG Run-qiu2   

  1. 1. College of Civil Engineering; Chongqing University; Chongqing 400045, China; 2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 3.Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education, Chongqing University, Chongqing 400045, China
  • Received:2012-07-12 Online:2012-11-22 Published:2012-12-11

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Abstract: It is important theoretical significance and application for the failure mechanism of rock and parameter selection of fracture surface that failure property of rock and roughness of fracture surface are studied. The unloading fracture property of rock, micro-mesoscpic characteristics of fracture surface, and the correlation between fractal dimension of fracture surface roughness and unloading rock mass strength are revealed under high stress, by adopting high precision of three-dimensional 3D laser scanning and scanning electron microscope (SEM), combined with fractal theory. The macro-fracture property of marble specimen is converted from shear and tensile-shear complex to tensile fracture development. The higher the initial confining pressure and the faster the unloading rate, the main fracture surface is more fluctuant and rough. But The higher the initial confining pressure and the slower unloading rate, the main fracture surface is more flat and smooth. With the increase of unloading rate, the microscopic fracture of the marble is gradually from traverse crystal sheared, tensioned-sheared complex along crystal face and traverse crystal, to tensioned or splited along crystal. The friction angle of unloading rock is larger, but the cohesion is smaller with the fractal dimension of main fracture increases.

Key words: color: black, font-family: "Times New Roman", mso-fareast-font-family: 宋体, mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, rock mechanics')">mso-bidi-language: AR-SA">rock mechanics, high stress, unloading, fractal geometry, scanning electron microscope

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  • TU 452
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