断裂岩石双翼表面细观接触特征与剪切强度关系

doi:10.13722/j.cnki.jrme.2014.0006

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Abstract The shear strength of fractured rocks is of great importance for the stability prediction of rock mass. In order to investigate the relationship of the contact configuration from micro scope of double rough surfaces in contact with the shear strength of fractured rocks，the creep shear tests are carried out for fractured rocks induced by compressive shear and indirect tension. By means of laser scanning image procession and the geometric reconstruction of the double rough surfaces in fractured rocks， and through“slice-island method”，the contact configuration and contact area are analyzed. The study shows that the contact shape displays an irregular“coast line”style for compressive shear fractures and“scattered islands”style for tensile fractures in rocks. The contact area for tensile fractured rocks is significantly greater than that for compressive shear fractured rocks. Although the formation mechanism of the fractured rocks is different，or even the applied normal forces are at different levels，the creep shear strength is directly proportional to the contact area，implying that the contact area can be a candidate index in evaluation of the influence of surface roughness to the shear strength of fractured rocks. The results remain a referential value in construction of the contact constitutive model as well as of shear strength criterion for the fracture rocks.

Key words： Fractured rocks Rough surface Micro-contact Shear strength

Received: 06 January 2014

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0006 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/I8/1522

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